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 [Search a list of Patent Appplications for class 310]   CLASS 310,ELECTRICAL GENERATOR OR MOTOR STRUCTURE
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SECTION I - CLASS DEFINITION

This is the residual class for all subject matter, not elsewhere classified, relating to electrical generator or motor structure.

(1) Note. This Class was produced in 1953 by making official the unofficial digests which have been established by the Examiners of Division 26 during the period from about 1900 onwards. A caveat is given: while it is believed that the titles and definitions are reasonably accurate, no assurance can be given that all the patents, issued prior to the date of reclassification, are in the proper subclass since only some of these individual patents were read during the reclassification project. Consequently, in making a thorough search in this class, it is advisable to investigate every subclass which may possibly be pertinent and not, in order to shorten the search, to rely upon the principle of superiority of subject matter because of position in the schedule, since that principle is applicable only in classes where each patent has been analyzed and placed in the schedule in accordance with that portion of the disclosed subject matter which is claimed.
(2) Note. Since Class 310 takes, under the class definition, only subject matter relating to electrical generator or motor structure not elsewhere classified, its scope can be determined only by determining the scope of other related classes, which classes are listed below under search class. Also consult the search notes in the definitions of these classes.
(3) Note. Many mechanical classes contain electrical disclosures, as where an electrical machine is disclosed in a mechanical environment, with which it cooperates. Consequently, in appropriate instances, the search must extend to the class or classes which relate to the environment in which the electrical disclosure may be found.

SECTION II - REFERENCES TO OTHER CLASSES

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4Baths, Closets, Sinks, and Spittoons,   subclass 213 for the subject matter of that class having electrical ventilating means.
57Textiles: Spinning, Twisting, and Twining,   subclass 100 for the apparatus of that class having electric motor driving means.
73Measuring and Testing,   appropriate subclasses for mechanical measuring and testing devices having electric motors or generators as part thereof.
84Music,   subclasses 600 through 722for electrical musical instruments having means to generate electric currents of particular wave form for use in musical instruments, such as electric organs. Note particularly indented subclasses 1.04+ for electric generators having means which are tuned to resonance.
105Railway Rolling Stock,   subclasses 49+ for electric locomotives.
123Internal-Combustion Engines,   subclass 149 for dynamos in combination with electric ignition systems for internal combustion engines.
124Mechanical Guns and Projectors,   subclass 3 for electromagnetic projectile propelling means.
160Flexible or Portable Closure, Partition, or Panel,   appropriate subclasses, particularly subclass 310 for this subject matter of that class having electric means to operate it.
173Tool Driving or Impacting, appropriate subclass for an electric motor for driving a tool combined with features peculiar to tool driving. Generally,   Class 310 includes motors having a named type of tool as a load. However Class 173 provides for a motor having specific impact delivering relationship to a tool, a passage to deliver cleansing or cooling fluid to a tool work surface, specific structure of a handle to manipulate a tool relative to work or plural motors, one of which is described as driving a tool and another as advancing a tool.
198Conveyors: Power-Driven,   subclass 381 , 439 and 619 for electromagnetic conveyors in which the device or material being moved is moved by the action of a magnetic field.
258Railway Mail Delivery,   subclass 4 for magnetic apparatus utilized in railway mail delivery.
307Electrical Transmission or Interconnections Systems,   appropriate subclasses for miscellaneous electric systems having electric generators. Note particularly subclass 82 , 84, 151, and 153.
315Electric Lamp and Discharge Devices: Systems,   subclass 55 for electric space discharge devices having combined therewith an integral electric generator or piezoelectric device, subclass 78 for vehicle space discharge device or lamp systems having a vehicle motor or vehicle motion driven generator.
318Electricity: Motive Power Systems,   appropriate subclasses for electric generator or motor structure having significant circuits connected thereto and for electric motor systems controlled by the control of the motor structure. Also note subclasses 538+ for electric motors, per se, having means to control or adjust them by control of the structure of the motor.
320Electricity: Battery or Capacitor Charging or Discharging,   appropriate subclass for a battery or capacitor charging system that utilizes an electric generator as a source of charge energy.
322Electricity: Single Generator Systems,   appropriate subclasses for electric generator having electric control systems.
323Electricity: Power Supply or Regulation Systems,   subclasses 201 through 204for voltage magnitude and phase control systems utilizing motor generator or dynamo electric machine sets.
324Electricity: Measuring and Testing,   appropriate subclasses for electrical measuring or testing devices and systems having electric generators or motors as part thereof. Note particularly subclasses 160+ for speed measuring systems having tachometer generators and subclasses 76.11+ for electric meters having electric generators or motors as part thereof.
335Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,   subclasses 220+ for electromagnets with armatures (i.e., electric motor of the reciprocating type).
336Inductor Devices,   appropriate subclasses for structure of inductor devices, (e.g., transformers and inductive reactors), particularly for details of induction windings and coils, magnetic cores and cooling means for inductor.
363Electric Power Conversion Systems,   subclasses 102+ , 150 and 174+ for electric power conversion systems utilizing dynamoelectric machine converters.
367Communications, Electrical: Acoustic Wave Systems and Devices,   appropriate subclass for compressional wave sensing systems having electro-vibrational transducers and for the corresponding transducers, per se.
416Fluid Reaction Surfaces (i.e., Impellers),   appropriate subclasses for electric motor driven impellers wherein the impeller is claimed as more than a named load.
417Pumps,   subclasses 410.1+ for pumps having electric drive motors.
505Superconductor Technology: Apparatus, Material, Process,   subclasses 150+ for high temperature (Tc 30 K) superconducting devices, and particularly subclasses 166+ for motors or generators.

SUBCLASSES

[List of Patents for class 310 subclass 1]    1
 This subclass is indented under the class definition.  Subject matter relating to assemblages of materials utilized in the fabrication of an electric generator or motor.

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434Education and Demonstration,   subclass 380 for the teaching of the construction of electric motors or generators.
  
[List of Patents for class 310 subclass 10]    10
 This subclass is indented under the class definition.  Subject matter relating to means for converting electrical energy between the electrical and the mechanical state by means of an electromagnetic effect.
(1) Note. Consult the classes referred to in the search notes to this class for other classes having similar subject matter.

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330Amplifiers,   subclass 58 for amplifiers including a rotating dynamoelectric machine as the active element thereof. See the Notes and Search Notes thereunder.
335Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,   subclasses 220+ for electromagnet with armature.
367Communications, Electrical: Acoustic Wave Systems and Devices,   subclasses 140+ for similar subject matter utilized in compressional wave sensing and detecting systems.
  
[List of Patents for class 310 subclass 11]    11
 This subclass is indented under subclass 10.  Subject matter having a fluid which is significantly related to the apparatus in a manner other than cooling or lubrication.
(1) Note. This subclass relates, for example, to dynamoelectric machinery in which the fluid may be conductive to electricity and to dynamoelectric machinery in which the fluid serves as a kinetic element to exert mechanical force.

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324Electricity: Measuring and Testing,   subclasses 92+ for the structure of integrating electric meters which utilize a conductive or genetic fluid.
376Induced Nuclear Reactions: Processes, Systems, and Elements,   subclasses 100+ for thermonuclear reactions utilizing conducting gases as fuels.
  
[List of Patents for class 310 subclass 12.01]    12.01Linear:
 This subclass is indented under subclass 10.  Subject matter in which a dynamoelectric device uses the electromagnetic effect to move or reposition a movable element in substantially straight-line motion with respect to a fixed element, i.e., stator, or to convert straight-line motion of the movable element into electrical energy.
(1) Note. The movable element is analogous to the rotor of a rotary machine, and is sometimes improperly referred to as a rotor.
(2) Note. Substantially straight-line motion may include travel in a path that deviates from a straight line, so long as the principle of operation is the same as for purely linear travel. For example, using a dynamoelectric effect to propel a toy train along a track arranged in an overall arcuate or circular path may be appropriate for this and indented subclasses if the type of motive force utilized at each location along the path is identical to that used for straight-line motion provided for in these subclasses.

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15through 24, for a dynamoelectric device in which a movable element moves in a straight line and reciprocates back and forth.
300,for a non-dynamoelectric linear motor or generator.

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104Railways,   subclass 282 for a railway vehicle and track having a linear motor which propels and suspends the vehicle, and subclasses 290-294 for a railway vehicle and track claimed in combination with a linear motor.
124Mechanical Guns and Projectors,   subclass 3 for an electromagnetic projectile propelling means.
318Electricity: Motive Power Systems,   subclass 38 , 135, and 687 for a linear movement motor in combination with a system of electrical supply and/or control.
  
[List of Patents for class 310 subclass 12.02]    12.02Having structure to facilitate assembly:
 This subclass is indented under subclass 12.01.  Subject matter wherein an element of a linear dynamoelectric device includes a particular feature that promotes ease, speed, or economy in the manufacture of the device.
(1) Note. Significant structural detail of a linear motor or generator must be recited for placement in this subclass. A nominal recitation of a motor part i.e., armature, stator, winding, shaft, etc., is not considered to be significant structure for placement in this subclass.

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29Metal Working,   subclasses 596 through 598for a method of dynamoelectric machine manufacture or assembly.
  
[List of Patents for class 310 subclass 12.03]    12.03Micromachine (e.g., MEMS device, nanotechnology):
 This subclass is indented under subclass 12.01.  Subject matter including a linear dynamoelectric device having extremely small overall dimensions.
(1) Note. Although the term "extremely small" is a relative term, no specific size limitation is attached to this definition. Interpretation of this term should be understood by the use of terms such as micro-, nano-, MEMS, miniature, etc., used in the description of the machine. Similarly, construction of a machine by, for example, integrated circuit technology on a semiconductor wafer, should be evidence for proper placement in this subclass.

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40,for rotary dynamoelectric device.
  
[List of Patents for class 310 subclass 12.04]    12.04Specific use device:
 This subclass is indented under subclass 12.01.  Subject matter including a linear dynamoelectric device, per se, having structure specifically adapted to perform a particular function or for a particular application.
(1) Note. This subclass provides for a linear dynamoelectric device intended to be used with a specific power supply.
  
[List of Patents for class 310 subclass 12.05]    12.05X-Y positioner:
 This subclass is indented under subclass 12.04.  Subject matter that including a linear dynamoelectric motor or motor combination, per se, that simultaneously or sequentially moves an object in mutually orthogonal directions.
  
[List of Patents for class 310 subclass 12.06]    12.06Precision type (e.g., for integrated circuit manufacture):
 This subclass is indented under subclass 12.05.  Subject matter including an X-Y positioner having the ability to move an object with a high degree of accuracy or resolution, especially for minute movements.
(1) Note. This subject matter is commonly used where exacting movement is required, such as, for example, in integrated circuit manufacture or similar high precision tasks.
  
[List of Patents for class 310 subclass 12.07]    12.07Projector (e.g., rail gun):
 This subclass is indented under subclass 12.04.  Subject matter that includes a linear dynamoelectric motor, per se, structurally arranged for launching a projectile.

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124Mechanical Guns and Projectors,   subclass 54 for a projector.
  
[List of Patents for class 310 subclass 12.08]    12.08Disk drive head motor:
 This subclass is indented under subclass 12.04.  Subject matter that includes a linear dynamoelectric motor, per se, having a structural detail particularly suited to reposition the head of a disk drive.
(1) Note. This subclass is limited to a linear motor subcombination, per se. See search note below for placement of a disk drive motor where a structural detail of a disk drive element other than a motor is recited.

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360Dynamic Magnetic Information Storage or Retrieval,   for a magnetic disk drive, especially subclasses 266.2 through 267.8for a magnetic disk drive with linear positioning of the head.
  
[List of Patents for class 310 subclass 12.09]    12.09Rail vehicle (e.g., train, trolley):
 This subclass is indented under subclass 12.04.  Subject matter including a linear dynamoelectric motor, per se, having a structural detail particularly suited to propel a device or conveyance employed for carrying persons or objects while the device or conveyance is supported for rolling or sliding movement along a track formed of a horizontally extending bar or bars.
(1) Note. This subclass is limited to the linear motor subcombination, per se, of the vehicle. See search note for such a motor combined with other vehicle structure.

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104Railways,   subclass 282 for a railway vehicle and track having a linear motor which propels and suspends the vehicle, and subclasses 290-294 for a railway vehicle and track claimed in combination with a linear motor.
  
[List of Patents for class 310 subclass 12.11]    12.11Conveyor or elevator motor:
 This subclass is indented under subclass 12.04.  Subject matter including a linear dynamoelectric motor, per se, having a structural detail particularly suited to linearly drive a hoisting machine or a apparatus for moving articles or bulk material from one place to another place.
  
[List of Patents for class 310 subclass 12.12]    12.12Generator:
 This subclass is indented under subclass 12.04.  Subject matter including a linear dynamoelectric device that converts linear mechanical movement of the movable element into electrical energy.
  
[List of Patents for class 310 subclass 12.13]    12.13Plural dynamoelectric machines (e.g., motors, generators):
 This subclass is indented under subclass 12.01.  Subject matter that including the combination of a linear motor or generator with another dynamoelectric machine.
(1) Note. The other dynamoelectric machine may be either another linear machine, or other type of dynamoelectric machine (e.g., reciprocating, oscillating, rotary, etc.).

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12.05,for a plural motor X-Y positioner.
300through 371, for a non-dynamoelectric device.
  
[List of Patents for class 310 subclass 12.14]    12.14Motor having both linear and rotary movement:
 This subclass is indented under subclass 12.01.  Subject matter including a linear motor having a movable element being driven in a linear path and also turned about its axis.
(1) Note. The linear and rotary movement may involve one or more movable elements.
  
[List of Patents for class 310 subclass 12.15]    12.15Plural stators or movable elements:
 This subclass is indented under subclass 12.01.  Subject matter including a linear dynamoelectric motor having more than one stator or more than one movable element.

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12.09,for a linear motor for a train.
  
[List of Patents for class 310 subclass 12.16]    12.16Voice coil type:
 This subclass is indented under subclass 12.01.  Subject matter in which the movable element comprises of a winding that is linearly movable by passing a current through the winding while the winding is within a magnetic field.

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12.08,for a flat linear motor specifically for use in a disk drive.

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360Dynamic Magnetic Information Storage or Retrieval,   for magnetic disk drive structure, especially subclass 264.7 for a disk drive with a voice coil head positioner.
381Electrical Audio Signal Processing Systems and Devices,   for loudspeaker structure, especially subclass 400 for a loudspeaker having a movable voice coil drive.
  
[List of Patents for class 310 subclass 12.17]    12.17Stepping or linear pulse type:
 This subclass is indented under subclass 12.01.  Subject matter including a linear dynamoelectric device structurally arranged to linearly move its movable element between two or more incremental positions of rest or equilibrium, and stop at a selected position of rest or equilibrium until an adjustment is made which causes movement to another incremental position of rest, i.e., stepping; or a linear dynamoelectric device that incrementally moves its movable element by applying a burst of magnetic energy at successive incremental positions along the linear path that forces the movable element into alignment with the magnetic field.
(1) Note. While a linear pulse motor may be constructed to stop or park at incremental positions, and thereby be a stepping motor, there is no such requirement that it do so. It may be moved steadily between successive incremental positions without parking until its ultimate destination is reached.

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12.05,for an X-Y positioner.
12.08,for a disk drive head motor.
49.01through 49.55, for a rotary stepping motor.
  
[List of Patents for class 310 subclass 12.18]    12.18Synchronous type (e.g., variable reluctance):
 This subclass is indented under subclass 12.01.  Subject matter wherein the speed of the movable element and either the frequency of the traveling magnet field used to drive the movable element in a motor, or the frequency of electricity generated from motion of the movable element in a generator, are directly related.

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309through 311, for an electrostatically driven linear motor.
  
[List of Patents for class 310 subclass 12.19]    12.19Having structure to facilitate control (e.g., position detector):
 This subclass is indented under subclass 12.01.  Subject matter including a linear dynamoelectric device with an included element provided as a subcombination of a system for regulating or monitoring the operation of the device.
(1) Note. This subclass provides especially for structure that may be a part of a control system, but as subcombination structure, is insufficient for placement in control systems. For example, a Hall effect sensor may be structurally included as a position detector, but in itself, does not have sufficient associated circuitry to be considered a control system or detection circuit.

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318Electricity: Motive Power Systems,   subclass 135 for electric control of a linear motor.
322Electricity: Single Generator Systems,   subclasses 49 through 98for control of a single generator.
324Electricity: Measuring and Testing,   subclass 765.01 for the testing of an assembled motor or generator not elsewhere classifiable.
  
[List of Patents for class 310 subclass 12.21]    12.21Coil structure:
 This subclass is indented under subclass 12.01.  Subject matter having significant physical detail of a wound conductor.
(1) Note. A coil connection, e.g., terminal, is provided for in this subclass.
(2) Note. This subclass provides for a superconductive coil.

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12.24,for a nominal coil used as an element of a magnet in a linear device.
  
[List of Patents for class 310 subclass 12.22]    12.22Shape or spacing (e.g., multiple phase winding):
 This subclass is indented under subclass 12.21.  Subject matter including a coil having a significant spatial form or contour, or plural coils or coil sections having a significant geometric orientation with respect to one another.
(1) Note. The spacing of coils or coil sections may be defined by their positions as defined by pole structure. However, significant coil structure or spacing must be recited for proper placement in this subclass.

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12.24,for magnet or pole structure having only nominally recited coil structure or spacing.
  
[List of Patents for class 310 subclass 12.23]    12.23Coating:
 This subclass is indented under subclass 12.21.  Subject matter including a coil having an applied cover layer on a winding conductor or overall winding.
(1) Note. A coating is commonly used to, for example, insulate, encapsulate, protect, or adhere a coil to a core.
  
[List of Patents for class 310 subclass 12.24]    12.24Magnet or pole structure:
 This subclass is indented under subclass 12.01.  Subject matter including significant detail of means for creating a magnetic field, or a low reluctance means to concentrate, direct or orient a magnetic field (i.e., pole).

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12.21,for detailed structure of a coil or winding for creating an electromagnetic field in a linear dynamoelectric machine.
40,for details of a magnet or pole structure in a rotary dynamoelectric machine.
  
[List of Patents for class 310 subclass 12.25]    12.25Size, spacing or orientation (e.g., tilted):
 This subclass is indented under subclass 12.24.  Subject matter including a magnet or pole having a specific dimension, a specified distance between one another, or a specified angular position with respect to the axis of movement of the movable element.

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12.24,for a combination of a magnet and pole structure reciting a significant portion of a flux path circuit.
  
[List of Patents for class 310 subclass 12.26]    12.26Shape:
 This subclass is indented under subclass 12.24.  Subject matter including a magnet or pole having a particular spatial form or contour.
  
[List of Patents for class 310 subclass 12.27]    12.27Mechanical element:
 This subclass is indented under subclass 12.01.  Subject matter for a mechanical subcombination of a linear dynamoelectric device unprovided for elsewhere.
  
[List of Patents for class 310 subclass 12.28]    12.28Commutation:
 This subclass is indented under subclass 12.27.  Subject matter including a slidable connection between a power supply and a winding.
  
[List of Patents for class 310 subclass 12.29]    12.29Cooling:
 This subclass is indented under subclass 12.27.  Subject matter including means for transferring or removing heat from a linear dynamoelectric device or one of its components.

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16,for cooling of a reciprocating motor or generator.
52through 65, for cooling of a rotary dynamoelectric machine.
216.014,for a cooling fin on a core having circumferentially offset laminations in a rotary dynamoelectric machine.
216.056,for a cooling fin on a laminated core of a rotary dynamoelectric machine.
216.119,for a cooling channel in the end ring of a core of a rotary dynamoelectric machine.
227,for current collector cooling in a rotary dynamoelectric machine.
417,for a rotary dynamoelectric machine end shield having ventilation holes.
  
[List of Patents for class 310 subclass 12.31]    12.31Support for movable element (e.g., bearing):
 This subclass is indented under subclass 12.27.  Subject matter including means for facilitating proper operational positioning or spatial geometric relationship between a stator and movable element.
(1) Note. Included in this subclass are, for example, particular bearing arrangements, including mechanical bearings, fluid bearings and magnetic bearings.
  
[List of Patents for class 310 subclass 12.32]    12.32Connection to load:
 This subclass is indented under subclass 12.27.  Subject matter including particular means for attaching a movable element of a linear dynamoelectric device to a device that is to be moved or repositioned by the device.
  
[List of Patents for class 310 subclass 12.33]    12.33Enclosure:
 This subclass is indented under subclass 12.27.  Subject matter including a significant detail of a housing for a linear dynamoelectric device.

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89,for a housing for a rotary dynamoelectric machine.
  
[List of Patents for class 310 subclass 13]    13Fixed and movable wound element type:
 This subclass is indented under subclass 12.01.  Subject matter in which both the fixed and the movable elements of the dynamoelectric device are provided with current carrying conductors or inductor.

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104Railways,   subclass 292 for a railway vehicle and track claimed in combination with a linear motor having fixed and movable wound elements on the track and vehicle, respectively.
  
[List of Patents for class 310 subclass 14]    14Solenoid and core type:
 This subclass is indented under subclass 12.01.  Subject matter in which the fixed and the movable elements of the dynamoelectric device are concentric and consist of a hollow winding and a plunger type armature passing thereunto.

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124Mechanical Guns and Projectors,   subclass 3 for electromagnetic guns and projectors.
335Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,   subclasses 255 through 264for similar subject matter.
  
[List of Patents for class 310 subclass 15]    15
 This subclass is indented under subclass 10.  Subject matter in which the movable element of the dynamoelectric device moves to and fro along a straight line path or along an arcuate path which is so short as to be substantially a straight line.
(1) Note. The term reciprocating, as used in this subclass, is limited to straight line motion or nonstraight line motion which is of such short extent that the interrelationship between the moving elements of the dynamoelectric device is substantially the same as if the motion were only along a straight line path.

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12.01through 12.33, for straight-line motion that is unidirectional and does not produce to-and-fro motion.
36+,for dynamoelectric devices which constrain the elements to oscillate to-and-fro motion and in which the extent of motion is such that some provision must be made for the nonlinear interaction between the relatively moving elements of the dynamoelectric device.

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30Cutlery,   subclass 45 for this subject matter combined with a razor.
84Music,   subclasses 725+ for this subject matter utilized in an electrical musical instrument, such as an electric guitar.
209Classifying, Separating, and Assorting Solids,   subclass 360 for this subject matter combined with a vibratory separator.
236Automatic Temperature and Humidity Regulation,   subclass 75 for this subject matter in an automatic temperature or humidity regulation system.
246Railway Switches and Signals,   subclasses 225+ for this subject matter in a railway switching or signaling system.
318Electricity: Motive Power Systems,   subclass 37 , 118, 119+, 556+, and 686 for this subject matter in an electric motor control system.
322Electricity: Single Generator Systems,   subclass 3 for this subject matter utilized in a single generator system.
335Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,   subclasses 87+ for this subject matter combined with a periodically actuated switch.
417Pumps,   subclasses 416+ for a reciprocating electric motor driving a reciprocating pump.
  
[List of Patents for class 310 subclass 16]    16
 This subclass is indented under subclass 15.  Subject matter having means for altering the temperature conditions of the machine.
(1) Note. This subclass relates, for example, to reciprocating motors having cooling means.

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52through 65, for cooling of a rotary electric machine, and the search notes therein, for cooling provided in subcombination elements of an electric motor or generator.

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336Inductor Devices,   subclasses 55+ for inductor devices with temperature modifying means (cooling means).
  
[List of Patents for class 310 subclass 17]    17
 This subclass is indented under subclass 15.  Subject matter having means for performing a function which is in addition to the function of the reciprocating dynamo device.
  
[List of Patents for class 310 subclass 19]    19
 This subclass is indented under subclass 17.  Subject matter having means for regulating the rate of motion or the duration of a period of inactivity of the reciprocating dynamoelectric device.

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318Electricity: Motive Power Systems,   subclasses 119+ for similar subject matter having a significant electrical circuit.
  
[List of Patents for class 310 subclass 20]    20
 This subclass is indented under subclass 17.  Subject matter having means for mechanically transforming the character or extent of motion delivered by or imparted to the dynamoelectric device.

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74Machine Element or Mechanism,   appropriate subclasses for mechanical movements for converting one type of motion to another type of motion.
  
[List of Patents for class 310 subclass 21]    21
 This subclass is indented under subclass 20.  Subject matter in which the moving element of the dynamoelectric device is supported either by a leaf spring or by a pivot located at a distance from the line of relative motion of the dynamoelectric device which is large relative to the extent of movement.
  
[List of Patents for class 310 subclass 22]    22
 This subclass is indented under subclass 21.  Subject matter having a plurality of movable elements or armatures.
  
[List of Patents for class 310 subclass 23]    23
 This subclass is indented under subclass 20.  Subject matter in which the relatively movable parts of the dynamoelectric device are concentric and consist of a hollow winding and a plunger type armature passing thereunto.
  
[List of Patents for class 310 subclass 24]    24
 This subclass is indented under subclass 23.  Subject matter having a plurality of plunger type armatures.
  
[List of Patents for class 310 subclass 25]    25
 This subclass is indented under subclass 15.  Subject matter in which the movable parts of the dynamoelectric device reciprocate or vibrate at a frequency which is determined by the natural period of the mounting means for the movable parts.
(1) Note. This subclass relates, for example, to reciprocating motors having a tuned reed type of armature. Generally, but not invariably, a state of resonance exists between the natural period of the movable armature and the impulses of an electric field.

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26,for similar subject matter utilizing magnetostrictive means.

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331Oscillators,   subclass 156 for electrical oscillators utilizing an electromechanical resonator of the vibrating reed or string type (e.g., tuning fork).
  
[List of Patents for class 310 subclass 26]    26
 This subclass is indented under subclass 15.  Subject matter having means to produce motion or electric energy by the action of magnetostriction.
(1) Note. Magnetostriction is a property exhibited by some materials which change their physical size or shape under the action of magnetic fields or which produce magnetic fields when physically stressed.

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318Electricity: Motive Power Systems,   subclass 118 for magnetostrictive motor systems.
331Oscillators,   subclass 157 for electrical oscillators utilizing an electromechanical resonator of the magnetostrictive type.
333Wave Transmission Lines and Networks,   subclass 148 and 201 for coupling networks having magnetostrictive elements as parts thereof.
335Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,   subclass 215 for this subject matter
367Communications, Electrical: Acoustic Wave Systems and Devices,   subclass 156 and 168 for magnetostrictive transducers used in underwater compressional wave production or sensing.
  
[List of Patents for class 310 subclass 27]    27
 This subclass is indented under subclass 15.  Subject matter in which both of the relatively movable parts of the dynamoelectric device include current carrying conductors or inductor.
  
[List of Patents for class 310 subclass 28]    28
 This subclass is indented under subclass 15.  Subject matter which is of the direct connected type.
(1) Note. This subclass relates, for example, to reciprocating electric motors where the reciprocating armature is directly connected to a source or absorber of motion.
  
[List of Patents for class 310 subclass 29]    29
 This subclass is indented under subclass 28.  Subject matter in which the relatively movable elements of the dynamoelectric device are supported by either of a leaf spring or a pivot located at a point remote from the line of motion of the dynamoelectric device when compared to the extent of motion of the latter.

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25,and 32, for this subject matter.
  
[List of Patents for class 310 subclass 30]    30
 This subclass is indented under subclass 28.  Subject matter in which the relatively movable parts of the dynamoelectric device are concentric and consist of a hollow winding and a plunger type armature passing thereunto.

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23,and 34+, for similar subject matter.
  
[List of Patents for class 310 subclass 31]    31
 This subclass is indented under subclass 15.  Subject matter in which the relative motion of the elements of the dynamoelectric device actuates an electrical switch which controls the flow of currents to windings associated with one of such elements.

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335Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,   subclasses 87+ for periodic electromagnetic switches.
340Communications: Electrical,   subclasses 384.1+ , especially subclasses 388.7 and 397.3 for interrupter in diaphragm and percussion type sound producer, respectively.
  
[List of Patents for class 310 subclass 32]    32
 This subclass is indented under subclass 31.  Subject matter in which the movable element of the dynamoelectric device is supported or carried by either a reed spring or a pivot located at a distance from the line of motion of a device which is large relative to the extent of motion of such element.

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21,and 29, for this subject matter.
  
[List of Patents for class 310 subclass 33]    33
 This subclass is indented under subclass 32.  Subject matter having plural armatures.
  
[List of Patents for class 310 subclass 34]    34
 This subclass is indented under subclass 31.  Subject matter in which the relatively movable elements of the dynamoelectric device include a hollow winding and an axial plunger or core embraced by such winding.
  
[List of Patents for class 310 subclass 35]    35
 This subclass is indented under subclass 34.  Subject matter having plural hollow windings and having means to energize the plural windings in sequence or at different times.
  
[List of Patents for class 310 subclass 36]    36
 This subclass is indented under subclass 10.  Subject matter in which the line of motion between the relatively movable elements of the dynamoelectric device lies along the arc of a portion of a circle and having means to accommodate such motion, over and above the means necessary for relative motion along a straight line.

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15+,for dynamoelectric devices having oscillate relative motion, but in which the extent of such motion does not require modification of the device because of the nonlinearity of the motion.
40+,for dynamoelectric devices having arcuate relative motion in which the motion exceeds 3605.

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236Automatic Temperature and Humidity Regulation,   subclass 75 for the subject matter of that class having oscillating electric motors.
318Electricity: Motive Power Systems,   subclass 37 , 119+, 556, and 686 for oscillating electric motor systems.
322Electricity: Single Generator Systems,   subclass 3 for oscillating generator systems.
  
[List of Patents for class 310 subclass 37]    37
 This subclass is indented under subclass 36.  Subject matter in which the relative motion between the elements of dynamoelectric device is communicated to a load by means of mechanical means which alter the character or amplitude of such motion.

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80+,for similar subject matter.

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74Machine Element or Mechanism,   appropriate subclasses for mechanical movements.
  
[List of Patents for class 310 subclass 38]    38
 This subclass is indented under subclass 36.  Subject matter in which the relative motion of the elements of the dynamoelectric device is transmitted to a load by an immediate attachment and without intervening transmitting parts or mechanisms.
  
[List of Patents for class 310 subclass 39]    39
 This subclass is indented under subclass 36.  Subject matter in which an electric switch or its equivalent controls the flow of currents through windings associated with one of the relative movable elements of the dynamoelectric device.

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335Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,   subclasses 87+ for vibratory switches.
340Communications: Electrical,   subclasses 384.1+ , especially subclasses 388.7 and 397.3 for interrupter in diaphragm and percussion type sound producer, respectively.
  
[List of Patents for class 310 subclass 40]    40
 This subclass is indented under subclass 10.  Subject matter in which the line of motion between the relatively movable elements of the dynamoelectric device lies along at least 360 degrees of the arc of a circle.
(1) Note. This subclass relates, for example, to dynamoelectric devices where the motion is continuous rotation in one direction, or where the rotation in one direction progresses for several turns before the rotation reverses in direction.

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314Electric Lamp and Discharge Devices: Consumable Electrodes,   subclasses 69+ for arc lights having rotary electric motor means to feed the carbons.
362Illumination,   subclass 193 for bicycle lights having an electric generator driven by the motion of the vehicle.
417Pumps,   subclasses 410.1+ for pumps having rotary electric drive motors.
  
[List of Patents for class 310 subclass 40.5]    40.5
 This subclass is indented under subclass 40.  Subject matter including a linkage, usually between the motor and its support, to cause the complete motor to rotate or oscillate with respect to its support in response to the rotary motion of the motor rotor or armature.

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416Fluid Reaction Surfaces (i.e., Impellers),   subclass 100 for oscillating electric fans where significant details of the impeller are recited.
  
[List of Patents for class 310 subclass 41]    41
 This subclass is indented under subclass 40.  Subject matter in which means are provided to impart initial rotation to the rotary element of the dynamoelectric device other than by the dynamoelectric effect.
(1) Note. The initial rotation, for example, may be effected by a hand crank.
  
[List of Patents for class 310 subclass 43]    43
 This subclass is indented under subclass 40.  Subject matter in which one or more component parts of the dynamo or electric device are fabricated of a plastic nonmetal, as by a casting or pressure molding operation.

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65Glass Manufacturing,   appropriate subclass for a process of working or treating glass.
264Plastic and Nonmetallic Article Shaping or Treating: Processes,   appropriate subclasses for methods for working or shaping plastic materials.
425Plastic Article or Earthenware Shaping or Treating: Apparatus,   appropriate subclasses for molding apparatus for shaping or reshaping plastic materials.
  
[List of Patents for class 310 subclass 44]    44
 This subclass is indented under subclass 40.  Subject matter in which one or more of the component parts of the dynamoelectric device are fabricated or powdered or sintered metal particles.

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75Specialized Metallurgical Processes, Compositions for Use Therein, Consolidated Metal Powder Compositions, and Loose Metal Particulate Mixtures,   subclasses 228+ for sintered metal powder compositions, such as those resulting from a process provided for in Class 419, Powder Metallurgy Processes and subclasses 255+ for metal containing powders.
419Powder Metallurgy Processes,   appropriate subclasses for processes of making articles by pressing and/or sintering metal particles.
  
[List of Patents for class 310 subclass 45]    45
 This subclass is indented under subclass 40.  Subject matter in which one or more parts of the dynamoelectric device have been treated with liquid material so as to retain within and/or on the surface of such parts residual amounts of such liquid material.
(1) Note. The coating or impregnation, for example, may be for the windings and may serve to exclude or displace moisture therefrom.

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336Inductor Devices,   subclass 205 for inductor having coil turns cemented or embedded in plastic.
427Coating Processes,   subclasses 58+ for processes of coating, per se, of electrical products.
  
[List of Patents for class 310 subclass 46]    46
 This subclass is indented under subclass 40.  Subject matter in which one of the relatively movable elements of the dynamoelectric device consist merely of magnetizable material and is free of inductor or conductive windings.
(1) Note. Since the dynamoelectric effect is necessary one of the attraction of the magnetizable material by magnetic pole induced therein, the devices of this subclass are generally motors.

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168+,for inductor type generators.
  
[List of Patents for class 310 subclass 47]    47
 This subclass is indented under subclass 46.  Subject matter in which the dynamoelectric device is arranged to be transported or operated while held in the hand.
(1) Note. Many of the motors of this subclass are disclosed as operating hair clippers or moving cutter type of shavers.

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50,for portable or hand held dynamoelectric devices other than magnetic motors.

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30Cutlery,   subclasses 43+ for dry shavers.
74Machine Element or Mechanism,   subclass 16 for power tables and stands.
318Electricity: Motive Power Systems,   subclass 17 for this subject matter having a significant electric circuit.
  
[List of Patents for class 310 subclass 48]    48
 This subclass is indented under subclass 46.  Subject matter in which the motor is combined with additional features over and above those required for its operation as a motor.

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17+,for similar combinations with reciprocating type dynamoelectric devices.
66+,for similar combinations with rotary type dynamoelectric devices, other than magnetic motors.
  
[List of Patents for class 310 subclass 49.01]    49.01Stepping:
 This subclass is indented under subclass 40.  Subject matter in which the relatively movable elements are rotated in increments of less than 360 degrees with respect to one another between one position of rest to another position of rest, and stopping at each incremental position of rest until an adjustment is made which causes rotation to another position of rest.
(1) Note. For this and indented subclasses, where the relatively movable elements include a fixed or stationary element and a movable element that rotates with respect to the fixed element, the fixed element will be referred to as a "stator" and the rotating element as a "rotor", with the rotor having a rotary axis about which the rotor rotates.
(2) Note. This subclass includes, for example, a magnetic motor in the nature of servomotor or follow-up device.

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12.17,for a linear stepping motor.
  
[List of Patents for class 310 subclass 49.02]    49.02Having a coil axially concentric to rotor axis (e.g., toroid coil):
 This subclass is indented under subclass 49.01.  Subject matter including an electrically conductive winding having a generally annular or ring shape periphery, wherein the geometric center of said periphery is located substantially on the rotary axis of a rotor.
(1) Note. The axially concentric coil is commonly mounted on a stator core of a motor surrounding the axis of the rotor. However, the coil does not have to actually surround the rotor structure, per se, for placement in this subclass. It need only surround the longitudinal axis of the rotor and be axially concentric therewith.
  
[List of Patents for class 310 subclass 49.03]    49.03With bias magnet to position rotor (e.g., parking magnet, auxiliary flux):
 This subclass is indented under subclass 49.02.  Subject matter including a means for causing a magnet field to help restrain or pull one of the relatively movable elements into a position of rest.
(1) Note. A bias magnet is commonly used to "park" or secure a rotor at an incremental step until an adjustment is made to cause the rotor to move to another incremental position of rest. Such position of rest is commonly designed to enable the restart of a motor. A bias magnet is also commonly used as an additional means of providing magnetic flux along with the primary coil.
  
[List of Patents for class 310 subclass 49.04]    49.04Bias magnet positioned between two axially concentric coils:
 This subclass is indented under subclass 49.03.  Subject matter having two axially concentric windings, and a bias magnet structurally arranged between the two windings.

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49.06,for a rotary stepper motor having plural axially concentric coils, each coil positioned axially adjacent to a rotor.
49.07,for a rotary stepper motor having an axially concentric coil adjacent to each axial end of a rotor.
49.19,for a rotary stepper motor having plural axially concentric coils.
  
[List of Patents for class 310 subclass 49.05]    49.05Axially adjacent to rotor end:
 This subclass is indented under subclass 49.02.  Subject matter including an axially concentric coil structurally arranged to surround a rotor s axis next to an axial end of the rotor without surrounding the rotor structure, per se.

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154.05,and 154.06, for an axial air gap motor or generator with a permanent magnet on the stator.
156.32through 156.37, for an axial air gap motor or generator with a permanent magnet on the rotor.
  
[List of Patents for class 310 subclass 49.06]    49.06Plural coil and rotor combinations:
 This subclass is indented under subclass 49.05.  Subject matter including more than one axially concentric coil and more than one rotor, wherein each coil is positioned axially adjacent to an axial end of a respective rotor.

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49.07,for a stepper motor with an axially concentric coil positioned adjacent to both axial ends of a rotor.
156.36through 156.37, for an axial air gap motor or generator with multiple stators and a permanent magnet rotor.
  
[List of Patents for class 310 subclass 49.07]    49.07Coil axially adjacent to each end of a rotor:
 This subclass is indented under subclass 49.05.  Subject matter including an axially concentric coil structurally arranged to surround a rotor s axis next to each axial end of the rotor without surrounding the rotor structure, per se.

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156.35,for an axial air gap motor or generator with two stators axially adjacent a permanent magnet rotor.
  
[List of Patents for class 310 subclass 49.08]    49.08Having poles extending to opposite radial sides of rotor:
 This subclass is indented under subclass 49.02.  Subject matter including a pair of members of ferromagnetic material, each having a first end positioned adjacent to, respectively, opposite north and south magnetic field ends of an axially concentric coil, wherein each ferromagnetic member has a second end opposite its first end, each ferromagnetic member providing a low-reluctance magnetic flux path between its first and second ends, the second ends (i.e., poles) being respectively positioned on opposite sides of the rotor axis adjacent a radial face of the rotor, whereby magnetic flux is directed perpendicular to the rotary axis.
(1) Note. The north and south magnetic ends of the coil can be provided by a plurality of coils in a magnetic series circuit, so long as the poles are arranged to provide flux from opposite magnetic ends of the combined coils.

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49.09,for a rotary stepping motor where poles extend to opposite axial ends of the rotor.
  
[List of Patents for class 310 subclass 49.09]    49.09Having poles extending to opposite axial ends of rotor:
 This subclass is indented under subclass 49.02.  Subject matter including a pair of members of ferromagnetic material, each having a first end positioned adjacent to, respectively, opposite north and south magnetic field ends of an axially concentric coil, wherein each ferromagnetic member has a second end opposite its first end, each ferromagnetic member providing a low-reluctance magnetic flux path between its first and second ends, the second ends (i.e., poles) being respectively positioned on opposite axial ends of the rotor axis adjacent an axial end face of the rotor, whereby magnetic flux is directed generally along or parallel to the rotary axis.
(1) Note. Commonly, the rotor is positioned radially inside the toroid coil, with poles of the coil extending radially inward and over the axial ends of the rotor.
(2) Note. The north and south magnetic ends of the coil can be provided by a plurality of coils in a magnetic series circuit, so long as the poles are arranged to provide flux from opposite magnetic ends of the combined coils.

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49.08,for a rotary stepping motor where poles extend to opposite radial sides of the rotor.
  
[List of Patents for class 310 subclass 49.11]    49.11Having particular flux plate or yoke:
 This subclass is indented under subclass 49.02.  Subject matter including specific structural detail of a low-reluctance member positioned adjacent to a magnetic pole face at an axial end of the axially concentric coil, i.e., "flux plate"; or a low-reluctance member structurally arranged to provide a magnetic flux path from one magnetic pole of the coil to the other pole, i.e., "yoke".
(1) Note. A flux plate may serve as a magnetic pole, or merely provide a flux path from the coil to a separate pole attached to the flux plate. It is commonly a relatively thin, flat plate or disc. A yoke commonly extends circumferentially around a coil s periphery to function as a flux path between flux plates.
  
[List of Patents for class 310 subclass 49.12]    49.12With alignment mechanism:
 This subclass is indented under subclass 49.11.  Subject matter including means for structurally orienting a flux plate or yoke in a particular position with respect to the axially concentric coil.
(1) Note. Alignment mechanisms commonly include structural features such as notches, protrusions, or markings, to align the flux plates or yoke into a preset position.
  
[List of Patents for class 310 subclass 49.13]    49.13Having coil bobbin:
 This subclass is indented under subclass 49.02.  Subject matter including specific detail of a support or spool about which the axially concentric coil is wound.

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194,for a motor or generator spool or coil support, per se.
  
[List of Patents for class 310 subclass 49.14]    49.14Integral with pole or flux plate:
 This subclass is indented under subclass 49.13.  Subject matter wherein the bobbin is structurally combined with a flux plate or pole piece in a unitary or monolithic structure.
  
[List of Patents for class 310 subclass 49.15]    49.15Having interfitting poles:
 This subclass is indented under subclass 49.02.  Subject matter including a plurality of poles extending from the north magnetic pole of the coil and a plurality of poles extending from the south magnetic pole of the coil, wherein the plurality of poles are spatially arranged in such a way as to alternate between a pole of one magnetic polarity of the coil and a pole of the other magnetic polarity of the coil.

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257,for an interfitting or claw-tooth stator.
263,for an interfitting or claw-tooth rotor.
  
[List of Patents for class 310 subclass 49.16]    49.16Having a particular dimension:
 This subclass is indented under subclass 49.15.  Subject matter wherein a specific size or spatial extent of one of the interfitting poles is recited.
  
[List of Patents for class 310 subclass 49.17]    49.17Having a particular shape:
 This subclass is indented under subclass 49.15.  Subject matter wherein a specific spatial form or contour of one of the interfitting poles is recited.
  
[List of Patents for class 310 subclass 49.18]    49.18With rotary to linear conversion:
 This subclass is indented under subclass 49.02.  Subject matter including means to change rotary stepping motion about an axis to motion along a line.
(1) Note. Such conversion may be performed by gearing, such as a threaded portion or worm gear inside the rotor.

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12.17,for a linear stepping motor.

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74Machine Element or Mechanism,   subclass 425 for worm gearing.
  
[List of Patents for class 310 subclass 49.19]    49.19Having plural axially concentric coils:
 This subclass is indented under subclass 49.02.  Subject matter including more than one axially concentric coil.

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49.04,for a rotary stepping motor having two axially concentric coils with a bias magnet positioned between the coils.
49.06,for a rotary stepping motor having a plurality of axially concentric coil and rotor combinations.
49.07,for a rotary stepping motor having an axially concentric coil axially adjacent each end of a rotor.
  
[List of Patents for class 310 subclass 49.21]    49.21Having a single axially concentric coil:
 This subclass is indented under subclass 49.02.  Subject matter including only one axially concentric coil.
  
[List of Patents for class 310 subclass 49.22]    49.22Axially thin type (e.g., disk-shaped motor, planer):
 This subclass is indented under subclass 49.01.  Subject matter including a stepping motor wherein the length along its rotary axis is small in relation to its radial dimension.
(1) Note. An axially thin or disk-shaped stepper motor is commonly found in a timepiece such as a wristwatch, etc.
  
[List of Patents for class 310 subclass 49.23]    49.23Having a particular stator feature:
 This subclass is indented under subclass 49.22.  Subject matter including an axially thin stepping motor having a specific structural detail of its stationary structure or stator.
  
[List of Patents for class 310 subclass 49.24]    49.24Asymmetric stator pole spacing:
 This subclass is indented under subclass 49.23.  Subject matter including an axially thin motor including a plurality of stator poles, wherein the plurality of poles are spaced at various or non-uniform distances from the rotor, thus defining various length air gaps; or poles that are arcuately arranged at various or non-uniform distances with respect to one another around the rotor s axis of rotation.

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49.36,for a rotary stepping motor having a permanent magnet rotor with axially directed flux path having asymmetric poles.
  
[List of Patents for class 310 subclass 49.25]    49.25Inner and outer notches:
 This subclass is indented under subclass 49.23.  Subject matter including an axially thin stepper motor having a stator including an indentation or groove on both the side of the stator or stator pole facing the rotor air gap (i.e., inner side), and on a side of the stator opposite to the side facing the rotor air gap (i.e. outer side).
(1) Note. The inner notch has the effect of enlarging the air gap between the rotor and the stator at the notch position. It is commonly used to, for example, reduce cogging torque applied to the rotor.
(2) Note. The outer notch has the effect of creating a magnetic saturation point at the location of the outer notch due to the concentration of flux in a smaller stator cross section, and commonly defines a boundary location between stator poles.
  
[List of Patents for class 310 subclass 49.26]    49.26Stator pole having inner notch:
 This subclass is indented under subclass 49.23.  Subject matter including an axially thin stepper motor having a pole with an indentation or groove on the side of the pole facing the rotor.
(1) Note. The inner notch has the effect of enlarging the air gap between the rotor and the stator at the notch position. It is commonly used to, for example, reduce cogging torque applied to the rotor.

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49.25,for an axially thin stepper motor having both inner and outer notches.
  
[List of Patents for class 310 subclass 49.27]    49.27Having integral poles:
 This subclass is indented under subclass 49.26.  Subject matter including a stator with an inner notch, and further having a plurality of poles that are structurally united or mechanically integrated without an air gap there between.
  
[List of Patents for class 310 subclass 49.28]    49.28Permanent magnet on stator:
 This subclass is indented under subclass 49.23.  Subject matter including an axially thin stepping motor having a stator including a permanently magnetized portion.
  
[List of Patents for class 310 subclass 49.29]    49.29Plural separate stator core sections facing rotor:
 This subclass is indented under subclass 49.23.  Subject matter including an axially thin stepper motor having a stator with a ferromagnetic flux concentration means (i.e., core) comprising more than one distinct segment, wherein each segment has a portion or surface (i.e. pole face) that is structurally arranged with respect to a rotor to provide an air gap between the respective pole faces and the rotor, across which magnetic flux is directed.
  
[List of Patents for class 310 subclass 49.31]    49.31Two sections:
 This subclass is indented under subclass 49.29.  Subject matter wherein the number of plural sections comprises two sections.
  
[List of Patents for class 310 subclass 49.32]    49.32Permanent magnet rotor with axially directed flux path:
 This subclass is indented under subclass 49.01.  Subject matter including a rotor having a permanent magnet for creating a magnetic flux field therein, wherein the magnet poles of the magnet are arranged to direct a flux path along the rotary axis of the rotor.
  
[List of Patents for class 310 subclass 49.33]    49.33Having stepping function related to a particular stator winding arrangement:
 This subclass is indented under subclass 49.32.  Subject matter including a specifically recited structural or operational detail of an electrical conductor or plurality of electrical conductors wound on the stator for creating a magnetic field in the stator, wherein the structural or operational detail is one that defines or governs the angular extent of the steps of the motor.

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49.33,for a stator winding arrangement in a reluctance-type stepper motor.
  
[List of Patents for class 310 subclass 49.34]    49.34Having particular stator pole feature:
 This subclass is indented under subclass 49.32.  Subject matter including a stepping motor having an axial flux path rotor that further includes a specifically recited structural detail of a stator pole.
  
[List of Patents for class 310 subclass 49.35]    49.35Shifted or skewed stator pole:
 This subclass is indented under subclass 49.34.  Subject matter including a stator pole wherein a line between the center of one axial end of the pole and the center of the opposite axial end of the pole is not parallel with the axis of rotation of the rotor.
(1) Note. A skewed pole is commonly interpreted as a pole with an axis of symmetry that is twisted away from the rotor axis. A shifted pole may include a segmented pole, where one of the segments is angularly shifted around the rotor s axis with respect to the other segment, so that the line between an axial end of one segment and the opposite axial end of the other segment is not parallel with the rotor s axis of rotation.
  
[List of Patents for class 310 subclass 49.36]    49.36Magnet in pole tooth:
 This subclass is indented under subclass 49.34.  Subject matter including a stator pole face having at least one projection (i.e., tooth) extending from the pole s face into an air gap between the pole face and a rotor, wherein the projection comprises a permanent magnet, or includes a permanent magnet therein.
  
[List of Patents for class 310 subclass 49.37]    49.37Having particular stator-pole to rotor-pole relationship:
 This subclass is indented under subclass 49.32.  Subject matter including a stepping motor with an axial flux path rotor that further includes a specifically recited structural detail of an interrelationship between a pole or poles on the rotor and a pole or poles on the stator.
(1) Note. Recited structural detail may include the number of poles on each of the rotor and stator, the pole number ratio, the relative position of the poles, etc.

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49.44,for a reluctance type stepper motor having a particular stator pole to rotor pole relationship.
  
[List of Patents for class 310 subclass 49.38]    49.38Having plural rotor cores of different lengths:
 This subclass is indented under subclass 49.32.  Subject matter including a permanent-magnet axial flux path rotor including more than one ferromagnetic element (i.e., core) for concentrating the magnetic flux of the permanent magnet, wherein the cores have various or non-uniform axial dimensions.
  
[List of Patents for class 310 subclass 49.39]    49.39Plural rotor sections (e.g., segmented rotor):
 This subclass is indented under subclass 49.32.  Subject matter including a stepping motor with an axial flux path rotor having two or more distinct rotor segments, wherein each segment includes a permanent magnet.
  
[List of Patents for class 310 subclass 49.41]    49.41Separated by non-magnetic spacer or air gap:
 This subclass is indented under subclass 49.39.  Subject matter including a stepping motor with an axial flux path rotor having at least two physically separated rotor sections with a non-ferromagnetic material arranged between the sections.
(1) Note. The non-ferromagnetic material may include air in the space between the separated rotor sections.
  
[List of Patents for class 310 subclass 49.42]    49.42Having dual axial air gaps:
 This subclass is indented under subclass 49.01.  Subject matter including a rotary stepping motor including two air gaps between the rotor and the stator, wherein each gap extends parallel to the rotary axis of the rotor.
  
[List of Patents for class 310 subclass 49.43]    49.43Reluctance type:
 This subclass is indented under subclass 49.01.  Subject matter wherein torque to drive a rotor is produced in the rotor by the presence of an external magnetic field that causes the rotor to move until its ferromagnetic material lines up in a minimum magnetic flux resistance (i.e., minimum reluctance) position in the magnetic flux path circuit of the external magnetic field, without requiring a separately excited or induced field in the rotor.
  
[List of Patents for class 310 subclass 49.44]    49.44Having a particular stator pole to rotor pole relationship:
 This subclass is indented under subclass 49.43.  Subject matter including a reluctance-type stepping motor with a specifically recited structural detail of the interrelationship between poles on the rotor and poles on the stator.
(1) Note. Recited structural detail may include the number of poles on each of the rotor and stator, the pole number ratio, the relative position of the poles, etc.

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49.37,for a stepper motor with a rotor axial flux path having a particular stator pole to rotor pole relationship.
  
[List of Patents for class 310 subclass 49.45]    49.45Having a stepping function related to a particular stator winding arrangement:
 This subclass is indented under subclass 49.43.  Subject matter including a specifically recited structural or operational detail of an electrical conductor or plurality of electrical conductors wound on the stator for creating a magnetic field in the stator, wherein the structural or operational detail is one that defines or governs the angular extent of the steps of the motor.

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49.33,for a winding arrangement in a stepper motor having a permanent magnet rotor with axial flux path.
  
[List of Patents for class 310 subclass 49.46]    49.46Having stator with winding and permanent magnet:
 This subclass is indented under subclass 49.43.  Subject matter in which a reluctance-type of stepper motor has a stator that contains both a magnetic field coil and a permanent magnet.
  
[List of Patents for class 310 subclass 49.47]    49.47Gearing defines stepping effect:
 This subclass is indented under subclass 49.01.  Subject matter including a stepper motor comprising a dynamoelectric machine and a mechanical mechanism having plural inter-engaging mechanical elements (i.e., gears), wherein the arcuate extent or distance of the motor s step or steps is a function of the structural inter-engaging relationship between the plural inter-engaging elements.

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82,for a motor or generator that utilizes a swash plate for motion conversion.
83,for a motor or generator that utilizes a gear for motion conversion.

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74Machine Element or Mechanism,   subclass 640 and its indented subclasses for gearing, per se.
318Electricity: Motive Power Systems,   subclasses 12 through 15for this subject matter having a significant electric control circuit.
475Planetary Gear Transmission Systems or Components,   subclasses 331 through 349for planetary gearing.
  
[List of Patents for class 310 subclass 49.48]    49.48Positioned in magnetic air gap:
 This subclass is indented under subclass 49.47.  Subject matter wherein at least one of the interengaging mechanical elements is structurally arranged in an air gap between a rotor and a stator.
  
[List of Patents for class 310 subclass 49.49]    49.49Pawl and ratchet type:
 This subclass is indented under subclass 49.47.  Subject matter wherein the plural interengaging elements include a pivoted or sliding element (i.e. pawl) that is adapted to fall into notches or spaces between teeth or projections on another element (i.e., ratchet) so as to permit motion in only one direction.

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74Machine Element or Mechanism,   subclasses 575 through 578for ratchet and pawl gearing, per se.
  
[List of Patents for class 310 subclass 49.51]    49.51Plural stators define stepping effect:
 This subclass is indented under subclass 49.01.  Subject matter including a stepper motor wherein the arcuate extent or distance of the motors step or steps is functionally related to the structure or structural relationship of more than one stator or stator section.
  
[List of Patents for class 310 subclass 49.52]    49.52Commutator defines stepping effect:
 This subclass is indented under subclass 49.01.  Subject matter including a stepper motor wherein the arcuate extent or distance of the motor s step or steps is functionally related to the structure or structural relationship, either with respect to each other or other elements of the motor, of a series of electrically conductive bars on the moving element of the motor that connect with windings in the movable element, and slidably engage electrically conductive brushes on the stationary element of the motor, to permit current flow between the moving and stationary elements of the motor.
  
[List of Patents for class 310 subclass 49.53]    49.53Permanent magnet defines stepping effect:
 This subclass is indented under subclass 49.01.  Subject matter including a stepper motor wherein the arcuate extent or distance of the motor s step or steps is functionally related to the structure, shape, placement or other arrangement of a permanent magnet positioned in the motor.
  
[List of Patents for class 310 subclass 49.54]    49.54Windings define stepping effect:
 This subclass is indented under subclass 49.01.  Subject matter including a stepper motor wherein the arcuate extent or distance of the motor s step or steps is functionally related to the structure, shape, placement or other arrangement of a winding or windings in the motor.

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49.33,for a stator winding arrangement in a stepper motor having a permanent magnet rotor with axial flux path.
49.46,for a stator winding arrangement in a reluctance-type stepper motor.
  
[List of Patents for class 310 subclass 49.55]    49.55Start or stop locating feature (e.g., parking magnet, detent):
 This subclass is indented under subclass 49.01.  Subject matter including structure that determines the position of a rotor at the beginning or end of a step.
(1) Note. Structure commonly used to perform this function includes, for example, a parking magnet, a notch in the magnetic circuit, or an asymmetric rotor/stator shape.
  
[List of Patents for class 310 subclass 50]    50
 This subclass is indented under subclass 40.  Subject matter in which the dynamoelectric device is arranged to be transported or operated while held in the hand.

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47,for portable or hand type rotary magnetic motors.

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173Tool Driving or Impacting,   appropriate subclass for a tool driving or impacting device and including hand manipulated tool driving or impacting means. An electric motor described as for tool driving is classified in Class 173 if specific impact delivering relationship to a tool is claimed, a passage to deliver cleansing or cooling fluid to a tool work surface is claimed or specific structure of a handle to manipulate a tool relative to work is claimed.
315Electric Lamp and Discharge Devices: Systems,   subclass 33 for electric lamp or space discharge devices having combined therewith some circuit element structure such as the generator, where the combination is adapted to be portable.
318Electricity: Motive Power Systems,   subclass 17 for this subject matter in combination with a significant system.
322Electricity: Single Generator Systems,   subclass 1 for portably mounted single generator systems.
  
[List of Patents for class 310 subclass 51]    51
 This subclass is indented under subclass 40.  Subject matter having means to inhibit, damp-out or insulate against the transmission of sound or mechanical oscillations or vibrations of the parts of the dynamoelectric device.

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74Machine Element or Mechanism,   subclass 573 for flywheel or rotor balancing means and subclass 574 for flywheel or rotor vibration damping means.
336Inductor Devices,   subclass 100 for inductor devices such as transformers, having means to suppress vibration.
  
[List of Patents for class 310 subclass 52]    52
 This subclass is indented under subclass 40.  Subject matter having means either to cool the dynamoelectric device or to contact a liquid or gas with the dynamoelectric device.
(1) Note. This and indented subclasses are generally directed to the cooling of the entire machine, and is also the residual area for cooling not otherwise provided for. For cooling subject matter specific to a particular subcombination element of a machine, the original classification should be placed into a subclass providing for the subcombination element, as set forth in the following search notes.

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16,for cooling of a reciprocating motor or generator.
12.29,for cooling of a linear motor or generator.
216.014,for a cooling fin on a core having cumferentially offset laminations in a rotary dynamoelectric machine.
216.056,for a cooling fin on a laminated core of a rotary dynamoelectric machine.
216.119,for a cooling channel in the end ring of a core of a rotary dynamoelectric machine.
227,for current collector cooling in a rotary dynamoelectric machine.
417,for a rotary dynamoelectric machine end shield having ventilation holes.

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105Railway Rolling Stock,   subclass 59 for electric locomotives having motor coolers.
165Heat Exchange,   subclasses 47+ for a structurally installed heat exchange means.
336Inductor Devices,   subclasses 55+ for inductor devices with temperature modifying means (cooling means).
  
[List of Patents for class 310 subclass 53]    53
 This subclass is indented under subclass 52.  Subject matter having control means.
(1) Note. This subclass relates, for example, to electric motors having means to control the amount of cooling or to control the amount of fluid contact.
  
[List of Patents for class 310 subclass 54]    54
 This subclass is indented under subclass 52.  Subject matter in which the cooling fluid or contacting fluid is a liquid under normal atmospheric temperatures and pressures.

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11,for this subject matter where the fluid is a conducting or kinetic fluid and subclass 87 for this subject matter where the dynamoelectric device is submersible in a liquid.
  
[List of Patents for class 310 subclass 55]    55
 This subclass is indented under subclass 52.  Subject matter in which the cooling fluid or contacting fluid is a gas under normal atmospheric temperatures and pressures and is other than atmospheric air.
(1) Note. This subclass relates, for example, to dynamoelectric devices having hydrogen cooling means. Hydrogen has a thermal conductivity greater than other common gases.
  
[List of Patents for class 310 subclass 56]    56
 This subclass is indented under subclass 52.  Subject matter having means to remove impurities from or otherwise condition the gas used as a cooling or contacting fluid.
(1) Note. This subclass relates, for example, to dynamoelectric devices having cooling means in the form of an air blast means and having filter means in the air passage.

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55,for this subject matter where the gas is a nonatmospheric gas.

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96Gas Separation: Apparatus,   for apparatus for gas separation, per se.
  
[List of Patents for class 310 subclass 57]    57
 This subclass is indented under subclass 52.  Subject matter in which a fluid is retained in the cooling system of a dynamoelectric device without loss or replacement, so as to serve merely as a heat transfer medium.

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165Heat Exchange,   subclasses 104.11+ for a heat exchanging system having an intermediate fluent material receiving and discharging heat.
  
[List of Patents for class 310 subclass 58]    58
 This subclass is indented under subclass 52.  Subject matter relating to the circulation of cooling or other fluid through the dynamoelectric device.
(1) Note. The fluid may, for example, be forced through the dynamoelectric device.
  
[List of Patents for class 310 subclass 59]    59
 This subclass is indented under subclass 58.  Subject matter having plural dynamoelectric units, or having plural paths through which the fluid may flow.
  
[List of Patents for class 310 subclass 60]    60
 This subclass is indented under subclass 58.  Subject matter having means integral with the dynamoelectric device for forcing fluid through the dynamoelectric device.
(1) Note. The means, for example, may be vanes attached to the rotor of the dynamoelectric device.

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417Pumps,   subclasses 366+ and 410.1+ for electric motor driven pumps where the pump is of general utility and not used merely to cool the electric motor.
  
[List of Patents for class 310 subclass 61]    61
 This subclass is indented under subclass 60.  Subject matter having means in the rotor of the dynamoelectric device to provide a duct or channel to accommodate a fluid flow along the duct or channel.
(1) Note. Frequently, for example, a radial or circumferential inclination of this duct or channel is sufficient to induce flow of fluid therethrough without other means for maintaining the flow.
  
[List of Patents for class 310 subclass 62]    62
 This subclass is indented under subclass 60.  Subject matter in which the pump or other propelling means for the cooling or contacting fluid is located downstream from the dynamoelectric device.
  
[List of Patents for class 310 subclass 63]    63
 This subclass is indented under subclass 60.  Subject matter in which the pump or other propelling means for the cooling or contacting fluid is located upstream from the dynamoelectric device.
  
[List of Patents for class 310 subclass 64]    64
 This subclass is indented under subclass 58.  Subject matter having means to facilitate, augment, or modify the transfer of heat from the dynamoelectric device from the cooling fluid or between different portions of the dynamoelectric device.

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165Heat Exchange,   subclass 185 for a heat transmitter (e.g., fin), per se.
  
[List of Patents for class 310 subclass 65]    65
 This subclass is indented under subclass 64.  Subject matter in which the means for facilitating, augmenting, or modifying the transfer of heat includes devices for maintaining parts of the dynamoelectric device out of contact with each other, so that either the cooling fluid has access to enlarged areas of the device or face-to-face heat transmitting contact is avoided.
(1) Note. The means for spacing the parts, for example, may provide cooling passages between laminae or coils.
  
[List of Patents for class 310 subclass 66]    66
 This subclass is indented under subclass 40.  Subject matter combined with some other type of subject matter.
(1) Note. The search should in all appropriate cases be continued in the class which relates to the environment with which the dynamoelectric device is combined.
  
[List of Patents for class 310 subclass 67]    67
 This subclass is indented under subclass 66.  Subject matter in which the other subject matter is in built or incorporated into the dynamoelectric device.

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105Railway Rolling Stock,   subclass 53 for electrical locomotives of the type in which the driving wheel is part of the electric motor.
180Motor Vehicles,   subclass 65.6 for a motor vehicle provided with an electric motor for driving it and wherein the motor may be affixed to a wheel of the vehicle.
362Illumination,   subclass 193 for bicycles light systems in which the bicycle light and an electric wheel driven generator are combined.
  
[List of Patents for class 310 subclass 68]    68
 This subclass is indented under subclass 66.  Subject matter in which the other subject matter is one or more electric circuit elements.

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318Electricity: Motor Power Systems,   subclasses 830+ for induction motor systems having circuit control means built into the induction motor.
  
[List of Patents for class 310 subclass 69]    69
 This subclass is indented under subclass 68.  Subject matter having a shaft driven switch.
(1) Note. This subclass relates, for example, to blasting generators having a shaft driven switch.
  
[List of Patents for class 310 subclass 70]    70
 This subclass is indented under subclass 69.  Subject matter having a distributor or timer.
(1) Note. This subclass relates, for example, to ignition magnetos having a distributor switch or a timer switch as an integral part thereof.
  
[List of Patents for class 310 subclass 71]    71
 This subclass is indented under subclass 68.  Subject matter having connectors, terminals or lead-ins.

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191Electricity: Transmission to Vehicles,   subclasses 2+ for electric motor traction systems having a system of distribution to energize the electric motor.
336Inductor Devices,   subclass 107 and 192 for inductive devices with connectors or having windings with terminals, taps or coil conductor end anchoring means, respectively.
439Electrical Connectors,   appropriate subclasses for a connector terminal, or lead-in, per se.
  
[List of Patents for class 310 subclass 72]    72
 This subclass is indented under subclass 68.  Subject matter having an impedance device.

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318Electricity: Motive Power Systems,   appropriate subclasses for electric motors having significant electric circuits.
  
[List of Patents for class 310 subclass 73]    73
 This subclass is indented under subclass 68.  Subject matter having illuminating devices.

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362Illumination,   appropriate subclasses for illuminating devices, per se, and for combined structure of illuminating and nonilluminating device.
  
[List of Patents for class 310 subclass 74]    74
 This subclass is indented under subclass 66.  Subject matter in which the other element is an inertia or flywheel device.

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74Machine Element or Mechanism,   subclasses 572+ for flywheels, per se, and for rotors, per se.
  
[List of Patents for class 310 subclass 75]    75
 This subclass is indented under subclass 66.  Subject matter in which the other element is a drive mechanism.

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118+,for similar subject matter.

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123Internal-Combustion Engines,   subclass 149 for internal combustion engines having generator igniting devices which are driven by the engine.
246Railway Switches and Signals,   subclass 245 for electric railway switching and signaling systems having a car actuated generator.
318Electricity: Motive Power Systems,   subclasses 9+ for this subject matter having a significant electric circuit.
  
[List of Patents for class 310 subclass 76]    76
 This subclass is indented under subclass 75.  Subject matter having a brake and a clutch.

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92+,for torque transmitting electrodynamic clutches or brakes, per se, and for the electric control systems for these devices.

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192Clutches and Power-Stop Control,   appropriate subclass for miscellaneous clutch and brake systems.
318Electricity: Motive Power Systems,   subclasses 362+ and the other classes and subclasses referred to in the search notes of these subclasses for this subject matter having a significant electric circuit.
  
[List of Patents for class 310 subclass 77]    77
 This subclass is indented under subclass 75.  Subject matter having a brake.
(1) Note. Consult the search notes to subclass 76, above.
  
[List of Patents for class 310 subclass 78]    78
 This subclass is indented under subclass 75.  Subject matter having a clutch.
(1) Note. Consult the search notes to subclass 76, above.
  
[List of Patents for class 310 subclass 79]    79
 This subclass is indented under subclass 75.  Subject matter having a shaft and armature timing or phasing connection.
(1) Note. This subclass relates, for example, to dynamoelectric devices having means for adjusting the space-phase of the dynamoelectric device with respect to its source of mechanical energy or its mechanical load.
  
[List of Patents for class 310 subclass 80]    80
 This subclass is indented under subclass 75.  Subject matter having motion conversion means.

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74Machine Element or Mechanism,   appropriate subclasses for mechanical movements.
318Electricity: Motive Power Systems,   subclass 14 for this subject matter having a significant circuit.
  
[List of Patents for class 310 subclass 81]    81
 This subclass is indented under subclass 80.  Subject matter having an unbalanced weight.
(1) Note. The subclass relates, for example, to dynamoelectric devices of the rotary type which have an unbalanced rotor and act to produce vibratory motion.

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601Surgery: Kinesitherapy,   subclasses 67+ for subject matter utilized for kinesitherapy.
  
[List of Patents for class 310 subclass 82]    82
 This subclass is indented under subclass 80.  Subject matter having a swash plate.

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74Machine Element or Mechanism,   subclass 60 for swash plate mechanisms, per se.
  
[List of Patents for class 310 subclass 83]    83
 This subclass is indented under subclass 80.  Subject matter having gearing.

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49.47through 49.49, for a rotary stepping motor in which gearing defines the stepping effect of the motor.

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74Machine Element or Mechanism,   subclasses 640+ for gearing, per se.
318Electricity: Motive Power Systems,   subclasses 12+ and 15 for this subject matter having a significant electric circuit.
475Planetary Gear Transmission Systems or Components,   for planetary gearing.
  
[List of Patents for class 310 subclass 84]    84
 This subclass is indented under subclass 80.  Subject matter relating to impulse couplings.
  
[List of Patents for class 310 subclass 85]    85
 This subclass is indented under subclass 66.  Subject matter having mechanical shields or protectors.

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361Electricity: Electrical Systems and Devices,   subclasses 600+ and the classes referred to in the search notes to Class 361, subclasses 600+ for housings for electrical apparatus.
  
[List of Patents for class 310 subclass 86]    86
 This subclass is indented under subclass 85.  Subject matter having a shield in the air gap.
  
[List of Patents for class 310 subclass 87]    87
 This subclass is indented under subclass 85.  Subject matter having means to render the device submersible.
  
[List of Patents for class 310 subclass 88]    88
 This subclass is indented under subclass 85.  Subject matter having means to render the device dirt, moisture or explosion proof.
(1) Note. A dynamoelectric device may be rendered explosion proof by filling all voids within the device in such manner that the passages are not sufficiently large to support a flame or explosion, because of the lose of energy from the flame or explosion by radiation to the surrounding mass of solid material.

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87,for this subject matter when submersible.
  
[List of Patents for class 310 subclass 89]    89
 This subclass is indented under subclass 85.  Subject matter relating to housings, windows or covers.

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12.33,for an enclosure for a linear electric motor.

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174Electricity: Conductors and Insulators,   subclasses 50+ for miscellaneous boxes and housings for electrical apparatus having only a single type of electrical apparatus within the box or housing. Also consult the search notes to Class 174, subclasses 50+ for related art.
  
[List of Patents for class 310 subclass 90]    90
 This subclass is indented under subclass 66.  Subject matter having means to adjust a bearing or an air cap or to lubricate a bearing.

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384Bearings,   appropriate subclasses for bearings or bearings and means to lubricate the bearing.
  
[List of Patents for class 310 subclass 90.5]    90.5Magnetic bearing:
 This subclass is indented under subclass 90.  Subject matter wherein the bearing has an induction field.

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219Electric Heating,   subclasses 647+ , especially indented subclass 648 for electrically heating a body while magnetically suspending or supporting it.
250Radiant Energy,   subclasses 201+ for photoelectric cell systems adapted for use in magnetic suspensions.
310Electrical Generator or Motor Structure,   subclass 166 for means for suspending a body by means of an induction field.
324Electricity: Measuring and Testing,   subclass 151 for electric meters having magnetic suspensions.
361Electricity: Electrical Systems and Devices,   subclasses 139+ for control circuits for electromagnetic devices, especially subclasses 143+ or magnetic retention.
  
[List of Patents for class 310 subclass 91]    91
 This subclass is indented under subclass 66.  Subject matter having supports.

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248Supports,   appropriate subclass for miscellaneous supports of general application.
  
[List of Patents for class 310 subclass 92]    92
 This subclass is indented under subclass 40.  Subject matter relating to torque transmitting clutches and brakes and the systems utilized with torque transmitting clutches.
(1) Note. The torque which is transmitted in the devices of this and indented subclasses is transmitted through the medium of an electromagnetic field. When the torque is transmitted by frictional contact, consult the classes referred to below under Search Class.

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73Measuring and Testing,   subclasses 862+ for torque type dynamometers, utilized in testing, some of which utilize electromagnetic clutches and brakes.
188Brakes,   for mechanical brakes. Note subclasses 158+ for electric operators for such brakes.
192Clutches and Power-Stop Control,   appropriate subclasses for mechanical clutches and for systems utilizing a mechanical clutch as part thereof.
318Electricity: Motive Power Systems,   appropriate subclass for electric motor systems having an electromagnetic clutch or brake as part thereof. Also consult the extensive search notes to the Class Definition of Class 318 (note particularly the References To Other Classes) for related art.
322Electricity: Single Generator Systems,   subclass 12 for single generator system having an electromagnetic clutch for connecting and disconnecting the generator from the source of power, and subclass 40 for similar subject matter and which the electromagnetic clutch is utilized to control the speed of the generator.
361Electricity: Electrical Systems and Devices,   subclass 207 for electrostatic relay circuits, such as those which utilize piezoelectric devices or the Winslow effect.
417Pumps,   subclasses 223+ for pumps having dynamoelectric clutches for connecting and disconnecting the pump from a source of mechanical power.
464Rotary Shafts, Gudgeons, Housings, and Flexible Couplings for Rotary Shafts,   appropriate subclasses for a flexible coupling between a shaft and driven member.
  
[List of Patents for class 310 subclass 93]    93
 This subclass is indented under subclass 92.  Subject matter utilized for braking.
(1) Note. Consult the search notes to subclass 92, above.

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188Brakes,   subclass 267 for a brake or shock absorber using magnetic flux to retard motion.
  
[List of Patents for class 310 subclass 94]    94
 This subclass is indented under subclass 92.  Subject matter having means to automatically control it.
(1) Note. Consult the search notes to subclass 92, above.
  
[List of Patents for class 310 subclass 95]    95
 This subclass is indented under subclass 94.  Subject matter automatically responsive to speed.

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361Electricity: Electrical Systems and Devices,   subclasses 236+ for miscellaneous speed controlled systems.
  
[List of Patents for class 310 subclass 96]    96
 This subclass is indented under subclass 92.  Subject matter having drive mechanism, other than the torque transmitting clutch or brake.

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75+,for similar subject matter utilized in rotary electric motors and generators.
  
[List of Patents for class 310 subclass 97]    97
 This subclass is indented under subclass 96.  Subject matter having an output bias or resistance device.
  
[List of Patents for class 310 subclass 98]    98
 This subclass is indented under subclass 96.  Subject matter having a drive motor.

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477Interrelated Power Delivery Controls, Including Engine Control,   for interrelated control between an engine and a transmission, clutch, or brake.
  
[List of Patents for class 310 subclass 99]    99
 This subclass is indented under subclass 96.  Subject matter having gearing means.

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83,for similar subject matter in rotary dynamoelectric machinery.
  
[List of Patents for class 310 subclass 100]    100
 This subclass is indented under subclass 96.  Subject matter having a mechanical clutch.

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192Clutches and Power-Stop Control,   appropriate subclasses for mechanical clutches, per se.
  
[List of Patents for class 310 subclass 101]    101
 This subclass is indented under subclass 92.  Subject matter having plural units.
  
[List of Patents for class 310 subclass 102]    102
 This subclass is indented under subclass 92.  Subject matter which is adapted to be used with a generator motor.
  
[List of Patents for class 310 subclass 103]    103
 This subclass is indented under subclass 92.  Subject matter in which the torque is transmitted through a magnetic field.

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92,through 102, for torque transmitting clutches in which the torque is transmitted through an electrostatic field or by means of the Winslow effect.
  
[List of Patents for class 310 subclass 104]    104
 This subclass is indented under subclass 103.  Subject matter having a shield in the air gap.
(1) Note. The shield may, for example hermetically separate the rotor from the stator.
  
[List of Patents for class 310 subclass 105]    105
 This subclass is indented under subclass 103.  Subject matter in which the magnetic field induces eddy or other induced currents.

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166+,for alternating current induction motors.
  
[List of Patents for class 310 subclass 106]    106
 This subclass is indented under subclass 105.  Subject matter having a magnetic reluctance feature.
  
[List of Patents for class 310 subclass 107]    107
 This subclass is indented under subclass 105.  Subject matter having collection means for the induced currents.

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219+,for current collectors, per se.
  
[List of Patents for class 310 subclass 108]    108
 This subclass is indented under subclass 107.  Subject matter having means to deliver the current which is collected to an external device.
(1) Note. The external device, for example, may be a variable resistance.
  
[List of Patents for class 310 subclass 109]    109
 This subclass is indented under subclass 108.  Subject matter in which the external device is an electric motor.
  
[List of Patents for class 310 subclass 110]    110
 This subclass is indented under subclass 108.  Subject matter in which the external device is an impedance.
  
[List of Patents for class 310 subclass 111]    111
 This subclass is indented under subclass 40.  Subject matter relating to the modification of generated wave forms.
(1) Note. This subclass relates, for example, to wave generators and to generators having a special distribution of coil windings to obtain a specific wave form.

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84Music,   subclasses 725+ for electrical and musical instruments having generator means to generate a particular way form, such as electric organs.
  
[List of Patents for class 310 subclass 112]    112
 This subclass is indented under subclass 40.  Subject matter relating to plural units which are structurally united.
(1) Note. This subclass relates, for example, to generators structurally united with exciters.

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322Electricity: Single Generator Systems,   subclass 13 for generator systems having an electric motor to drive the generator.
323Electricity: Power Supply or Regulation Systems,   subclass 202 for balancer set systems.
  
[List of Patents for class 310 subclass 113]    113
 This subclass is indented under subclass 112.  Subject matter relating to motor generator sets.

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363Electric Power Conversion Systems,   subclass 104 for dynamoelectric machine converter systems having plural structurally united units.
  
[List of Patents for class 310 subclass 114]    114
 This subclass is indented under subclass 40.  Subject matter having plural rotary elements.

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112,for subject matter having plural distinct units.
  
[List of Patents for class 310 subclass 115]    115
 This subclass is indented under subclass 114.  Subject matter in which both the field and the armature of a dynamoelectric device rotate.

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318Electricity: Motive Power Systems,   subclass 539 for this subject matter in combination with a significant electric circuit.
388Electricity: Motor Control Systems,   subclasses 835+ for running-speed control systems in which the field as well as the armature may be rotatable.
  
[List of Patents for class 310 subclass 116]    116
 This subclass is indented under subclass 115.  Subject matter in which the amount of motion is limited.
  
[List of Patents for class 310 subclass 117]    117
 This subclass is indented under subclass 116.  Subject matter having means to mechanically bias one or both of the rotatable elements.
  
[List of Patents for class 310 subclass 118]    118
 This subclass is indented under subclass 115.  Subject matter having drive mechanism to interconnect the field and armature.

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75+,for similar subject matter.
  
[List of Patents for class 310 subclass 119]    119
 This subclass is indented under subclass 118.  Subject matter in which the interconnecting mechanism is a fluid drive mechanism.

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11,for dynamoelectric devices having a kinetic fluid.
  
[List of Patents for class 310 subclass 120]    120
 This subclass is indented under subclass 118.  Subject matter in which the drive mechanism is friction drive mechanism.
  
[List of Patents for class 310 subclass 121]    121
 This subclass is indented under subclass 118.  Subject matter in which the interconnection drive mechanism includes a mechanical element whose motion is controlled by means other than the armature or the field.
(1) Note. The mechanical element, for example, may be an escapement.
  
[List of Patents for class 310 subclass 122]    122
 This subclass is indented under subclass 121.  Subject matter in which the mechanically controlled element is controlled by an additional dynamoelectric machine.

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112+,for plural units which are structurally united.
  
[List of Patents for class 310 subclass 123]    123
 This subclass is indented under subclass 121.  Subject matter in which the mechanically controlled element is controlled by means of a friction brake.

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77,for similar subject matter.
  
[List of Patents for class 310 subclass 124]    124
 This subclass is indented under subclass 114.  Subject matter having plural short circuited rotary elements.
  
[List of Patents for class 310 subclass 125]    125
 This subclass is indented under subclass 124.  Subject matter in which one of the short circuited elements is of the squirrel cage type.

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166+,for alternating current induction motors having squirrel cage type rotors.

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318Electricity: Motive Power Systems,   subclasses 318+ for plural induction motor rotor members with a significant electric circuit which may include plural squirrel cage members; and subclasses 830+ for plural short circuited induction motor rotor members in an electric motor system controlled by movable motor structure.
  
[List of Patents for class 310 subclass 126]    126
 This subclass is indented under subclass 114.  Subject matter having plural armatures in a common field.
  
[List of Patents for class 310 subclass 127]    127
 This subclass is indented under subclass 40.  Subject matter having plural collectors for transferring the current between the rotor and a stationary part of the dynamoelectric device.

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318Electricity: Motive Power Systems,   subclasses 495+ for miscellaneous electric motor systems having plural armature or rotor windings with means to control the current flowing therein.
323Electricity: Power Supply or Regulation Systems,   subclass 203 for dynamoelectric machine systems for controlling the voltage magnitude and plural sets of brushes.
  
[List of Patents for class 310 subclass 128]    128
 This subclass is indented under subclass 127.  Subject matter having both commutator and slip ring type collectors.
  
[List of Patents for class 310 subclass 129]    129
 This subclass is indented under subclass 128.  Subject matter adapted for use as a synchronous or rotary converter.

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307Electrical Transmission or Interconnection Systems,   subclasses 45+ , 82 and 151 for miscellaneous conversion systems having rotary converters.
318Electricity: Motive Power Systems,   subclass 719 for synchronous motor systems wherein the synchronous motors are self excited.
363Electric Power Conversion Systems,   subclasses 102+ and 174+ for rotary converter systems.
  
[List of Patents for class 310 subclass 130]    130
 This subclass is indented under subclass 129.  Subject matter adapted to be used for plural wire direct current systems.
(1) Note. This subclass relates, for example, to converters adapted to be used with the Edison three wire systems.

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323Electricity: Power Supply or Regulation Systems,   subclass 202 for balancer set systems.
  
[List of Patents for class 310 subclass 131]    131
 This subclass is indented under subclass 128.  Subject matter having plural separate armature circuits.
  
[List of Patents for class 310 subclass 132]    132
 This subclass is indented under subclass 131.  Subject matter having a polyphase armature winding.
  
[List of Patents for class 310 subclass 133]    133
 This subclass is indented under subclass 128.  Subject matter having an armature winding which is common to both the commutator and the slip ring collector.
  
[List of Patents for class 310 subclass 134]    134
 This subclass is indented under subclass 133.  Subject matter having plural field windings.

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363Electric Power Conversion Systems,   subclass 104 for this subject matter in combination with a significant electric conversion circuit.
  
[List of Patents for class 310 subclass 135]    135
 This subclass is indented under subclass 128.  Subject matter having means to connect the field of the dynamoelectric device to the commutator collector.
  
[List of Patents for class 310 subclass 136]    136
 This subclass is indented under subclass 127.  Subject matter having plural commutator type collectors.
  
[List of Patents for class 310 subclass 137]    137
 This subclass is indented under subclass 136.  Subject matter adapted to be used as double current direct current machines.
  
[List of Patents for class 310 subclass 138]    138
 This subclass is indented under subclass 137.  Subject matter in which one of the commutator type collectors is adapted to be used as an input and the other is adapted to be used as an output.
(1) Note. This subclass relates, for example, to the Dynamotor type machines.
  
[List of Patents for class 310 subclass 139]    139
 This subclass is indented under subclass 137.  Subject matter having hetro-axial excitation.
(1) Note. This subclass relates, for example, to double current direct current machines having cross field excitation.
  
[List of Patents for class 310 subclass 140]    140
 This subclass is indented under subclass 136.  Subject matter having plural armature windings.
  
[List of Patents for class 310 subclass 141]    141
 This subclass is indented under subclass 140.  Subject matter having plural field windings.

SEE OR SEARCH CLASS:

363Electric Power Conversion Systems,   subclass 104 for this subject matter in combination with a significant electric conversion circuit.
  
[List of Patents for class 310 subclass 142]    142
 This subclass is indented under subclass 136.  Subject matter having plural field windings.

SEE OR SEARCH CLASS:

363Electric Power Conversion Systems,   subclass 104 for this subject matter in combination with significant electric conversion circuit.
  
[List of Patents for class 310 subclass 143]    143
 This subclass is indented under subclass 127.  Subject matter having plural slip ring sets.
  
[List of Patents for class 310 subclass 144]    144
 This subclass is indented under subclass 143.  Subject matter having plural armature windings.

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322Electricity: Single Generator Systems,   subclass 90 for this subject matter when utilized in a single generator system.
  
[List of Patents for class 310 subclass 145]    145
 This subclass is indented under subclass 144.  Subject matter having plural sets of poles.
  
[List of Patents for class 310 subclass 146]    146
 This subclass is indented under subclass 144.  Subject matter in which the armature windings are polyphase windings.
  
[List of Patents for class 310 subclass 147]    147
 This subclass is indented under subclass 144.  Subject matter in which the slip rings are connected in the field circuit.
  
[List of Patents for class 310 subclass 148]    148
 This subclass is indented under subclass 127.  Subject matter having plural sets of brushes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

239+,and 248+, for brush holders or rigging and for brushes, per se.

SEE OR SEARCH CLASS:

322Electricity: Single Generator Systems,   subclass 53 for single generator systems wherein the generator has an odd number of brushes as, for example, third brush type generator.
323Electricity: Power Supply or Regulation Systems,   subclass 203 for dynamoelectric voltage magnitude machines having plural sets of brushes in combination with a significant electrical system.
  
[List of Patents for class 310 subclass 149]    149
 This subclass is indented under subclass 148.  Subject matter having plural field windings.

SEE OR SEARCH CLASS:

363Electric Power Conversion Systems,   subclass 104 for this subject matter in combination with a significant electric conversion circuit.
  
[List of Patents for class 310 subclass 150]    150
 This subclass is indented under subclass 149.  Subject matter having means for connecting the field windings in a polyphase manner.
  
[List of Patents for class 310 subclass 151]    151
 This subclass is indented under subclass 148.  Subject matter having means for connecting one brush to another brush by a direct connection having negligible impedance.

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322Electricity: Single Generator Systems,   subclass 92 for this subject matter in a generating system.
  
[List of Patents for class 310 subclass 152]    152
 This subclass is indented under subclass 40.  Subject matter having a permanent magnet.

SEE OR SEARCH THIS CLASS, SUBCLASS:

49.28,for a rotary disk-type stepping motor having a permanent magnet in the stator.
49.32,for a rotary stepping motor having a permanent magnet motor with an axially directed flux path.
49.36,for a rotary stepping motor having a permanent magnet in a pole tooth.
49.46,for a rotary stepping motor of the reluctance type having a stator with a winding and a permanent magnet.
49.53,for a rotary stepping motor in which a permanent magnet defines the stepping effect.

SEE OR SEARCH CLASS:

335Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,   subclass 84 , 92, 179, 205+, and 229+ for devices comprising at least one permanent magnet combined with an armature.
  
[List of Patents for class 310 subclass 153]    153
 This subclass is indented under subclass 152.  Subject matter in which the permanent magnet is combined with a flywheel.
(1) Note. This subclass relates, for example, to flywheel magneto machines.

SEE OR SEARCH CLASS:

74Machine Element or Mechanism,   subclasses 572+ for flywheels and rotors, per se.
  
[List of Patents for class 310 subclass 154.01]    154.01Permanent magnet stator:
 This subclass is indented under subclass 152.  Subject matter having at least one permanent magnet on the stator of a dynamoelectric machine.
(1) Note. If the field permanent magnet is combined with a field electromagnet, then 310/181 takes precedence.

SEE OR SEARCH THIS CLASS, SUBCLASS:

181,For windings and core structures having a combined permanent and electromagnet.
  
[List of Patents for class 310 subclass 154.02]    154.02Combined with generating coil:
 This subclass is indented under subclass 154.01.  Subject matter wherein at least one permanent magnet is combined with a generator coil on the stator.
  
[List of Patents for class 310 subclass 154.03]    154.03Means for securing magnet:
 This subclass is indented under subclass 154.01.  Subject matter including a specific means for securing at least one permanent magnet to the stator.
  
[List of Patents for class 310 subclass 154.04]    154.04Cantilevered:
 This subclass is indented under subclass 154.03.  Subject matter wherein at least one permanent magnet is supported from one of its ends on the stator, as in a cantilevered fashion.
  
[List of Patents for class 310 subclass 154.05]    154.05Axial:
 This subclass is indented under subclass 154.03.  Subject matter wherein at least one permanent magnet is mounted perpendicular to the axis of rotation of the dynamoelectric machine and provides magnetic flux into an axial air gap which extends parallel to the axis of rotation.
  
[List of Patents for class 310 subclass 154.06]    154.06Plural set of magnets:
 This subclass is indented under subclass 154.05.  Subject matter including plural sets of permanent magnets, which are mounted perpendicular to the axis of rotation and provide magnetic flux into an axial air gap with the rotor of a dynamoelectric machine.
  
[List of Patents for class 310 subclass 154.07]    154.07Adhesive:
 This subclass is indented under subclass 154.03.  Subject matter wherein at least one permanent magnet is secured on the stator with an adhesive, such as epoxy or thermosetting resin.
  
[List of Patents for class 310 subclass 154.08]    154.08Mounted to magnetic yoke:
 This subclass is indented under subclass 154.03.  Subject matter wherein at least one permanent magnet is mounted on a magnetic yoke.
  
[List of Patents for class 310 subclass 154.09]    154.09Split housing/yoke:
 This subclass is indented under subclass 154.03.  Subject matter wherein at least one permanent magnet is secured so that it straddles two or more portions of the magnetic yoke or a magnetic housing of the dynamoelectric machine.
  
[List of Patents for class 310 subclass 154.11]    154.11Embedded in core or pole:
 This subclass is indented under subclass 154.03.  Subject matter wherein at least one permanent magnet which is inserted in a hole in a magnetic core or pole of the stator, or has a magnetic core or pole formed around the permanent magnet.
  
[List of Patents for class 310 subclass 154.12]    154.12Cylindrical sleeve holder:
 This subclass is indented under subclass 154.03.  Subject matter including a hollow tube type holder, i.e., cylindrical sleeve holder, other than a magnetic core or pole, presses at least one permanent magnet in a radial direction to secure the permanent magnet on the stator.
  
[List of Patents for class 310 subclass 154.13]    154.13Holder with pocket for magnet:
 This subclass is indented under subclass 154.03.  Subject matter including a specific holding means, other than a magnetic core or pole, having a pocket for holding at least one permanent magnet on the dynamoelectric machine.
  
[List of Patents for class 310 subclass 154.14]    154.14Spring clip:
 This subclass is indented under subclass 154.03.  Subject matter wherein at least one permanent magnet is secured on the stator with a spring clip positioned in a groove between circumferential side surfaces of at least one permanent magnet.
  
[List of Patents for class 310 subclass 154.15]    154.15Clip secured to housing:
 This subclass is indented under subclass 154.14.  Subject matter where the spring clip is secured to the housing or magnetic yoke of the dynamoelectric machine.
  
[List of Patents for class 310 subclass 154.16]    154.16Axially pressing on magnets:
 This subclass is indented under subclass 154.03.  Subject matter including a mounting means which secures at least one permanent magnet by axially pressing against a side of at least one permanent magnet.
  
[List of Patents for class 310 subclass 154.17]    154.17Wedging between:
 This subclass is indented under subclass 154.03.  Subject matter including a wedge positioned between the circumferential side surfaces of at least one permanent magnet.
  
[List of Patents for class 310 subclass 154.18]    154.18With a magnetic wedge:
 This subclass is indented under subclass 154.17.  Subject matter wherein the wedge is made of a magnetic material.
  
[List of Patents for class 310 subclass 154.19]    154.19With an integral wedge:
 This subclass is indented under subclass 154.18.  Subject matter wherein the magnetic wedge is integrally formed with the housing or magnetic yoke of the dynamoelectric machine.
  
[List of Patents for class 310 subclass 154.21]    154.21Permanent magnet characterized by the shape of the magnet:
 This subclass is indented under subclass 154.01.  Subject matter wherein at least one permanent magnet has a distinctive shape.
  
[List of Patents for class 310 subclass 154.22]    154.22With specific dimension:
 This subclass is indented under subclass 154.21.  Subject matter wherein the shape of at least one permanent magnet has a specific dimension.
  
[List of Patents for class 310 subclass 154.23]    154.23Horseshoe:
 This subclass is indented under subclass 154.21.  Subject matter wherein the shape of at least one permanent magnet is in the form of a horseshoe.
  
[List of Patents for class 310 subclass 154.24]    154.24Bar, square, or rectangular:
 This subclass is indented under subclass 154.21.  Subject matter wherein at least one shape of the permanent magnet or magnets is a bar, square, or rectangle.
  
[List of Patents for class 310 subclass 154.25]    154.25Disk, ring, or cylinder:
 This subclass is indented under subclass 154.21.  Subject matter wherein the shape of at least one permanent magnet is in the form of a disk, cylinder, or ring.
  
[List of Patents for class 310 subclass 154.26]    154.26With means to prevent or reduce demagnetization (i.e. auxiliary magnetic poles):
 This subclass is indented under subclass 154.01.  Subject matter including a specific means, i.e., auxiliary pole, to prevent or reduce the demagnetization of at least one permanent magnet on the stator.
  
[List of Patents for class 310 subclass 154.27]    154.27With an auxiliary pole extending between stator magnet and rotor:
 This subclass is indented under subclass 154.26.  Subject matter wherein the means to prevent and reduce demagnetization specifically includes an auxiliary magnetic pole with a portion extending between at least one permanent magnet and a rotor of the dynamoelectric machine.
  
[List of Patents for class 310 subclass 154.28]    154.28Specific magnetization:
 This subclass is indented under subclass 154.01.  Subject matter including a specific magnetization pattern in at least one permanent magnet on the stator.
(1) Note. Asymmetrical magnet poles or a varying magnetic field intensity across a magnetic pole are specific magnetization patterns.
  
[List of Patents for class 310 subclass 154.29]    154.29Specific position or shape:
 This subclass is indented under subclass 154.28.  Subject matter including a specific magnetization pattern created by the placement of multiple permanent magnets or a specific magnetization pattern created by a specific shape of at least one permanent magnet.
  
[List of Patents for class 310 subclass 154.31]    154.31Single pole pair:
 This subclass is indented under subclass 154.01.  Subject matter wherein at least one permanent magnet on the stator produces only a single set of magnetic pole pair on the stator.
(1) Note. This subclass relates to a dynamoelectric machine having only a single horseshoe shaped permanent magnet on stator with the rotor positioned between the ends of the horseshoe.
  
[List of Patents for class 310 subclass 154.32]    154.32Permanent magnet extends along an axis:
 This subclass is indented under subclass 154.31.  Subject matter wherein at least one permanent magnet occupies a plane parallel to a central axis of the stator.
(1) Note. This subclass relates to a dynamoelectric machine having a horseshoe magnet with both ends of the magnet forming poles for the dynamoelectric machine and the rest of the magnet extending in a plane parallel to the axis of rotation.
  
[List of Patents for class 310 subclass 154.33]    154.33Plural rotors:
 This subclass is indented under subclass 154.31.  Subject matter including more than one rotor in the dynamoelectric machine, wherein at least one permanent magnet on the stator provides a single magnetic pole pair for each rotor simultaneously.
  
[List of Patents for class 310 subclass 154.34]    154.34With adjustable magnet structure:
 This subclass is indented under subclass 154.31.  Subject matter wherein a magnetic portion of the stator is adjustable to effect the magnetic properties of the stator.
  
[List of Patents for class 310 subclass 154.35]    154.35With specific pole pieces or pole shoes:
 This subclass is indented under subclass 154.31.  Subject matter wherein at least one permanent magnet is connected to magnetic pole pieces or pole shoes having specific details.
  
[List of Patents for class 310 subclass 154.36]    154.36Circumferentially spaced poles and magnets:
 This subclass is indented under subclass 154.35.  Subject matter wherein the pole pieces or pole shoes are aligned circumferentially with at least one permanent magnets.
  
[List of Patents for class 310 subclass 154.37]    154.37Poles extending axially from magnets:
 This subclass is indented under subclass 154.35.  Subject matter wherein pole pieces or pole shoes extend from a surface of at least one permanent magnet in a direction of the axis of rotation.
  
[List of Patents for class 310 subclass 154.38]    154.38Pole shoe shape:
 This subclass is indented under subclass 154.35.  Subject matter wherein the magnetic pole pieces or pole shoes have a specific shape.
  
[List of Patents for class 310 subclass 154.39]    154.39Different size:
 This subclass is indented under subclass 154.35.  Subject matter wherein the magnetic pole pieces or pole shoes are of unequal size.
  
[List of Patents for class 310 subclass 154.41]    154.41Laminated:
 This subclass is indented under subclass 154.35.  Subject matter wherein the magnetic pole pieces or pole shoes are formed from laminated magnetic material.
  
[List of Patents for class 310 subclass 154.42]    154.42Induced flux return pole:
 This subclass is indented under subclass 154.35.  Subject matter including induced magnetic pole on the stator which act as flux returns paths to at least one permanent magnets.
  
[List of Patents for class 310 subclass 154.43]    154.43Additional permanent magnets:
 This subclass is indented under subclass 154.01.  Subject matter wherein the stator of the dynamoelectric machine includes additional permanent magnets which provide the main magnetic flux for the dynamoelectric machine.
  
[List of Patents for class 310 subclass 154.44]    154.44Additional shield or coating (non-magnetic):
 This subclass is indented under subclass 154.01.  Subject matter including a non-magnetic shield or coating formed from non-magnetic material directly on at least one permanent magnet.
  
[List of Patents for class 310 subclass 154.45]    154.45Multiple pole pairs:
 This subclass is indented under subclass 154.01.  Subject matter wherein at least one permanent magnet on the stator forms multiple magnetic pole pairs on the stator.
  
[List of Patents for class 310 subclass 154.46]    154.46With specific pole shoe pieces:
 This subclass is indented under subclass 154.45.  Subject matter wherein at least one permanent magnet is connected to magnetic poles or pole shoes having specific details.
  
[List of Patents for class 310 subclass 154.47]    154.47Magnet extending between two poles:
 This subclass is indented under subclass 154.45.  Subject matter wherein at least one permanent magnet contacts and extends between two magnetic pole shoes.
  
[List of Patents for class 310 subclass 154.48]    154.48Induce flux return pole:
 This subclass is indented under subclass 154.45.  Subject matter including induced magnetic pole in the stator acting as flux return paths for at least one permanent magnet.
  
[List of Patents for class 310 subclass 154.49]    154.49Adjustable:
 This subclass is indented under subclass 154.45.  Subject matter wherein a magnetic portion of the stator structure is adjustable to effect the magnetic properties of the stator.
  
[List of Patents for class 310 subclass 155]    155
 This subclass is indented under subclass 154.01.  Subject matter having means, in relation with the permanent magnet stator, to produce a variable reluctance so that the amount of magnetic flux traversing a certain part of the magnetic path varies.

SEE OR SEARCH THIS CLASS, SUBCLASS:

168+,for this subject matter in nonpermanent magnet alternating current generators.
  
[List of Patents for class 310 subclass 156.01]    156.01Permanent magnet rotor:
 This subclass is indented under subclass 152.  Subject matter having at least one permanent magnet on the rotor of a dynamoelectric machine.

SEE OR SEARCH CLASS:

324Electricity: Measuring and Testing,   subclass 146 for similar subject matter utilized in electric meters.
  
[List of Patents for class 310 subclass 156.02]    156.02Transverse flux:
 This subclass is indented under subclass 156.01.  Subject matter wherein the permanent magnet rotor of the dynamoelectric machine is used in a transverse flux machine(i.e. a machine having a stator with a single-phase toroidal coil within a "U" -Shaped magnetic core).

SEE OR SEARCH THIS CLASS, SUBCLASS:

164,for details of the toroidal coil,
266,for a double air gap rotor,
268,for a disk shaped rotor.
  
[List of Patents for class 310 subclass 156.03]    156.03With a hysteresis ring:
 This subclass is indented under subclass 156.01.  Subject matter wherein the rotor of rotor of the dynamoelectric machine has at least one ring of a material which is subject to a hysteresis effect.
  
[List of Patents for class 310 subclass 156.04]    156.04Separate portion of the rotor magnet used as a thrust bearing:
 This subclass is indented under subclass 156.01.  Subject matter wherein at least one permanent magnet of the rotor has a distinctive portion of the magnet which produces magnetic flux acting solely as a thrust bearing to support the rotor in the machine.

SEE OR SEARCH THIS CLASS, SUBCLASS:

90.5,for details of a rotor with separate dynamo rotor magnet and thrust bearing magnet.
  
[List of Patents for class 310 subclass 156.05]    156.05Separate portion of the rotor magnet used as a magnet for sensing(i.e. for position or frequency):
 This subclass is indented under subclass 156.01.  Subject matter wherein at least one permanent magnet of the rotor has a distinctive portion of the magnet which produces magnetic flux acting solely as a source of magnetic flux for a rotor position sensor or rotor frequency sensor.

SEE OR SEARCH THIS CLASS, SUBCLASS:

156.06,for details of a rotor with separate dynamoelectric machine rotor magnet and position sensing magnets with a combined flux; 68B for details of a combined motor and rotor position sensor;

SEE OR SEARCH CLASS:

324Electricity: Measuring and Testing,   subclass 160 for details of speed sensor.
324Electricity: Measuring and Testing,   subclass 207.11 for details of magnetic position sensors.
  
[List of Patents for class 310 subclass 156.06]    156.06Combined with flux for sensing:
 This subclass is indented under subclass 156.01.  Subject matter wherein the flux from at least one permanent magnet of the rotor is combined with the flux from an additional permanent magnet for a rotor position or rotor frequency sensor.

SEE OR SEARCH THIS CLASS, SUBCLASS:

156.05,for details of a rotor with the dynamoelectric machine rotor magnetacts or includes a portion to act as a rotor position sensor or rotor frequency sensor.
68,B, for details of a combined motor and position sensor.

SEE OR SEARCH CLASS:

324Electricity: Measuring and Testing,   subclass 160 for details of speed sensors
  
[List of Patents for class 310 subclass 156.07]    156.07Additional flux directing magnets:
 This subclass is indented under subclass 156.01.  Subject matter wherein the rotor includes both at least one main permanent magnet to provide the majority of the magnetic flux for the machine and an additional permanent magnet mounted on the rotor which guides the magnetic flux flow from the main permanent magnet in a particular direction.
  
[List of Patents for class 310 subclass 156.08]    156.08Mounting (such as on a surface of a shaft):
 This subclass is indented under subclass 156.01.  Subject matter wherein at least one permanent magnet on the rotor is mounted directly on a shaft for rotation therewith.
  
[List of Patents for class 310 subclass 156.09]    156.09Keyed to shaft:
 This subclass is indented under subclass 156.08.  Subject matter wherein the mounting includes a key and keyway between at least one permanent magnet and the shaft.
  
[List of Patents for class 310 subclass 156.11]    156.11Magnets in shaft:
 This subclass is indented under subclass 156.08.  Subject matter wherein at least one permanent magnet is mounted physically within the shaft or coaxial with the shaft structure and sharing the same rotational axis as the shaft.
  
[List of Patents for class 310 subclass 156.12]    156.12Mounted on a sleeve/hub:
 This subclass is indented under subclass 156.08.  Subject matter wherein at least one permanent magnet of the rotor is mounted on the outer surface of a sleeve/hub which is between the permanent magnet and the shaft of the rotor.
  
[List of Patents for class 310 subclass 156.13]    156.13Keyed to a sleeve/hub:
 This subclass is indented under subclass 156.12.  Subject matter including a key and keyway between the magnet and the sleeve/hub to secure the magnet to the sleeve/hub.
  
[List of Patents for class 310 subclass 156.14]    156.14Knurl between the sleeve/hub and a shaft:
 This subclass is indented under subclass 156.12.  Subject matter including a knurl surface between the sleeve/hub and the shaft of the rotor.
  
[List of Patents for class 310 subclass 156.15]    156.15Induced flux pole on sleeve/hub:
 This subclass is indented under subclass 156.12.  Subject matter wherein at least one permanent magnet is mounted on the sleeve/hub in which additional magnetic poles are induced by the magnetic flux of the permanent magnet mounted on the sleeve/hub.
  
[List of Patents for class 310 subclass 156.16]    156.16Spring mounted:
 This subclass is indented under subclass 156.12.  Subject matter including at least one resilient element such as a coil spring or a leaf spring to secure the permanent magnet to the sleeve/hub.
  
[List of Patents for class 310 subclass 156.17]    156.17Spring mounted flux shunt:
 This subclass is indented under subclass 156.16.  Subject matter including means for mounting at least one magnetically soft element on a resilient support which allow the magnetically soft element to be moved in proximity to at least one permanent magnet.
  
[List of Patents for class 310 subclass 156.18]    156.18With a threaded fastener:
 This subclass is indented under subclass 156.08.  Subject matter wherein the assembly for mounting at least one permanent magnet of the dynamoelectric machine to the rotor includes at least one threaded fastener such as a bolt or screw.
  
[List of Patents for class 310 subclass 156.19]    156.19With a wedge:
 This subclass is indented under subclass 156.08.  Subject matter wherein the mounting includes at least one wedge applying pressure to at least one permanent magnet to secure it in place on the rotor.
  
[List of Patents for class 310 subclass 156.21]    156.21With an adhesive:
 This subclass is indented under subclass 156.08.  Subject matter wherein the mounting includes an adhesive such as epoxy or thermo-setting resin for securing at least one permanent magnet to the rotor.
  
[List of Patents for class 310 subclass 156.22]    156.22With an axial end clamp:
 This subclass is indented under subclass 156.08.  Subject matter wherein the mounting includes at least one element applying axial pressure to the end of at least one permanent magnet to secure it on the rotor.
  
[List of Patents for class 310 subclass 156.23]    156.23With casting material around the magnet:
 This subclass is indented under subclass 156.08.  Subject matter wherein the mounting includes a casting material or potting material enveloping at least a portion of at least one permanent magnet to secure it to the rotor.
  
[List of Patents for class 310 subclass 156.24]    156.24Including a spring mount to modify a flux:
 This subclass is indented under subclass 156.08.  Subject matter wherein a portion of the rotor is spring mounted to be movable to adjust the position of the permanent magnet so as to modify a flux in the air gap between the rotor and a stator of the dynamoelectric machine.
  
[List of Patents for class 310 subclass 156.25]    156.25Having radially magnetized and axially offset magnets:
 This subclass is indented under subclass 156.08.  Subject matter wherein the rotor includes a plurality of permanent magnets which are radially magnetized and axially offset relative to one another.
  
[List of Patents for class 310 subclass 156.26]    156.26Mounted on a bell shape hub:
 This subclass is indented under subclass 156.08.  Subject matter wherein at least one permanent magnet is secured to an inner or outer surface of bell shaped hub to form the rotor.
  
[List of Patents for class 310 subclass 156.27]    156.27With thermal compensation:
 This subclass is indented under subclass 156.08.  Subject matter including an element to compensate structural changes caused by temperature variations experienced by at least one permanent magnet and rest of the rotor.
  
[List of Patents for class 310 subclass 156.28]    156.28Sleeve covering magnet face:
 This subclass is indented under subclass 156.08.  Subject matter wherein the mounting includes a sleeve, extending over the magnetic face of at least one permanent magnet and holding at least one permanent magnet on the rotor.
  
[List of Patents for class 310 subclass 156.29]    156.29Sleeve parallel to magnetic face:
 This subclass is indented under subclass 156.08.  Subject matter wherein the mounting includes a sleeve, extending around the sides of at least one permanent magnet to hold at least one permanent magnet on the rotor.
  
[List of Patents for class 310 subclass 156.31]    156.31Banding around magnet:
 This subclass is indented under subclass 156.08.  Subject matter wherein the mounting includes multiple wrappings of a band to secure the magnet on the rotor.
  
[List of Patents for class 310 subclass 156.32]    156.32Including an axial air gap:
 This subclass is indented under subclass 156.01.  Subject matter wherein at least one permanent magnet of the rotor is oriented to provide an axial magnetic air gap between the rotor and a stator the dynamoelectric machine.
  
[List of Patents for class 310 subclass 156.33]    156.33With pole shoes:
 This subclass is indented under subclass 156.32.  Subject matter including pole pieces or pole shoes in physical contact and magnetic contact with at least one permanent magnet.
  
[List of Patents for class 310 subclass 156.34]    156.34With a stator between a rotating flux return plate and rotor magnet:
 This subclass is indented under subclass 156.32.  Subject matter wherein the stator is sandwiched between the permanent magnet rotor and a flux return plate.
  
[List of Patents for class 310 subclass 156.35]    156.35With single rotor magnet and plural stators:
 This subclass is indented under subclass 156.32.  Subject matter wherein the permanent magnet rotor is sandwiched between a pair of stators.
  
[List of Patents for class 310 subclass 156.36]    156.36With plural sets of rotating magnets:
 This subclass is indented under subclass 156.32.  Subject matter wherein the permanent magnet rotor includes plural axially spaced sets of rotating permanent magnets.
  
[List of Patents for class 310 subclass 156.37]    156.37With single stator and plural sets of rotating magnets:
 This subclass is indented under subclass 156.36.  Subject matter wherein the stator is sandwiched between two sets of rotating permanent magnets of the rotor.
  
[List of Patents for class 310 subclass 156.38]    156.38Specific shape:
 This subclass is indented under subclass 156.01.  Subject matter wherein at least one permanent magnet has a distinctive shape.
  
[List of Patents for class 310 subclass 156.39]    156.39Horseshoe:
 This subclass is indented under subclass 156.38.  Subject matter wherein at least one permanent magnet has a horseshoe shape.
  
[List of Patents for class 310 subclass 156.41]    156.41Triangular:
 This subclass is indented under subclass 156.38.  Subject matter wherein at least one permanent magnet has a triangular shape.
  
[List of Patents for class 310 subclass 156.42]    156.42Star:
 This subclass is indented under subclass 156.38.  Subject matter wherein at least one permanent magnet has a star shape.
  
[List of Patents for class 310 subclass 156.43]    156.43Specific magnetization:
 This subclass is indented under subclass 156.38.  Subject matter wherein at least one permanent magnet has a specific magnetization pattern.
  
[List of Patents for class 310 subclass 156.44]    156.44Different pole width:
 This subclass is indented under subclass 156.43.  Subject matter wherein the physical dimensions of at least one permanent magnet create form the magnetic poles of unequal size on the rotor.
  
[List of Patents for class 310 subclass 156.45]    156.45Specific dimensions:
 This subclass is indented under subclass 156.43.  Subject matter wherein at least one permanent magnet has specific dimensions such as arc length, thickness, width or axial length which effects the pattern of the magnetic flux emanating from at least one permanent magnet.
  
[List of Patents for class 310 subclass 156.46]    156.46Shaped to vary air:
 This subclass is indented under subclass 156.43.  Subject matter wherein at least one permanent magnet of the dynamoelectric machine includes a specific shape to vary the physical dimensions of the working air gap between the rotor and a stator of the dynamoelectric machine.
  
[List of Patents for class 310 subclass 156.47]    156.47Skewed:
 This subclass is indented under subclass 156.43.  Subject matter wherein at least one permanent magnets of the dynamoelectric machine is arranged such that the magnetic poles of the rotor are displaced in a circumferential direction over the axial length of the rotor.
  
[List of Patents for class 310 subclass 156.48]    156.48Pole shoes or pole pieces:
 This subclass is indented under subclass 156.01.  Subject matter wherein at least one permanent magnet of the dynamoelectric machine includes pole pieces or pole shoes in physical contact and magnetic contact with the permanent magnets.

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156.33,for permanent magnet dynamos with pole shoes and an axial air gap with the stator field coils.
  
[List of Patents for class 310 subclass 156.49]    156.49Radial flux path and radially positioned pole shoes:
 This subclass is indented under subclass 156.48.  Subject matter wherein at least one permanent magnet is radially magnetized with pole pieces or pole shoes disposed radially with respect to at least one permanent magnet.
  
[List of Patents for class 310 subclass 156.51]    156.51Laminated pole shoes and multiple pole pairs:
 This subclass is indented under subclass 156.49.  Subject matter wherein multiple magnetic pole pairs are formed on the rotor by at least one permanent magnets, having laminated pole pieces or pole shoes in physical contact and magnetic contact with at least one permanent magnet.
  
[List of Patents for class 310 subclass 156.52]    156.52Laminated pole shoes with single pole pair:
 This subclass is indented under subclass 156.49.  Subject matter wherein a single magnetic pole pair is formed on the rotor by at least one permanent magnet, having laminated pole shoes in physical contact and magnetic contact with at least one permanent magnet.
  
[List of Patents for class 310 subclass 156.53]    156.53Embedded in a core:
 This subclass is indented under subclass 156.49.  Subject matter wherein at least one permanent magnet of the dynamoelectric machine is embedded in a magnetic core which forms the rotor of the machine.
  
[List of Patents for class 310 subclass 156.54]    156.54Induced flux return poles:
 This subclass is indented under subclass 156.53.  Subject matter including induced flux return poles formed on the core.
  
[List of Patents for class 310 subclass 156.55]    156.55Circumferential flux path and circumferential pole shoes:
 This subclass is indented under subclass 156.48.  Subject matter wherein at least one permanent magnet of the dynamoelectric machine are circumferentially magnetized with pole pieces or poles shoes disposed circumferentially with respect to at least one permanent magnet.
  
[List of Patents for class 310 subclass 156.56]    156.56Embedded:
 This subclass is indented under subclass 156.55.  Subject matter wherein the pole pieces or pole shoes are formed by embedding at least one permanent magnet in a core.
  
[List of Patents for class 310 subclass 156.57]    156.57With slots or holes to guide flux:
 This subclass is indented under subclass 156.55.  Subject matter wherein the polepieces or pole shoes include slots or holes to guide the flux.
  
[List of Patents for class 310 subclass 156.58]    156.58Different size pole shoes:
 This subclass is indented under subclass 156.55.  Subject matter wherein the pole pieces or pole shoes are of different sizes.
  
[List of Patents for class 310 subclass 156.59]    156.59Pole shoes fixed to hub or shaft:
 This subclass is indented under subclass 156.55.  Subject matter wherein the circumferentially positioned pole pieces or pole shoes are fixed to a hub or shaft of the rotor.
  
[List of Patents for class 310 subclass 156.61]    156.61Pole shoes fixed with end plates:
 This subclass is indented under subclass 156.55.  Subject matter wherein the circumferentially positioned pole pieces or pole shoes are fixed to axial end plates of the permanent magnet of the rotor.
  
[List of Patents for class 310 subclass 156.62]    156.62Axially magnetized with poles shoes at one end:
 This subclass is indented under subclass 156.48.  Subject matter wherein at least one permanent magnet is axially magnetized with poles pieces or pole shoes positioned at only one axial end of the permanent magnet.
  
[List of Patents for class 310 subclass 156.63]    156.63Laminated pole shoes:
 This subclass is indented under subclass 156.62.  Subject matter wherein the pole pieces or pole shoes are laminated.
  
[List of Patents for class 310 subclass 156.64]    156.64Axially magnetized with poles shoes at both ends:
 This subclass is indented under subclass 156.48.  Subject matter wherein at least one permanent magnet is axially magnetized with pole pieces or pole shoes positioned at both axial ends of the permanent magnet.
  
[List of Patents for class 310 subclass 156.65]    156.65Laminated pole shoes:
 This subclass is indented under subclass 156.64.  Subject matter wherein the pole pieces or pole shoes are laminated.
  
[List of Patents for class 310 subclass 156.66]    156.66Claw poles/interfitting poles/lundel:
 This subclass is indented under subclass 156.01.  Subject matter wherein at least one permanent magnet of the dynamoelectric machine includes interfitting/claw-pole/lundel type pole pieces or pole shoes.
  
[List of Patents for class 310 subclass 156.67]    156.67Laminated pole shoes:
 This subclass is indented under subclass 156.66.  Subject matter wherein the pole pieces or pole shoes are laminated.
  
[List of Patents for class 310 subclass 156.68]    156.68Poles formed by magnets:
 This subclass is indented under subclass 156.66.  Subject matter wherein at least one permanent magnet forms the interfitting/claw-pole/lundel poles.
  
[List of Patents for class 310 subclass 156.69]    156.69Plural sets of claw poles:
 This subclass is indented under subclass 156.66.  Subject matter wherein the rotor includes multiple sets of interfitting/claw-pole/lundel poles arranged in the axial direction.
  
[List of Patents for class 310 subclass 156.71]    156.71Claw poles extend in the same axial direction:
 This subclass is indented under subclass 156.66.  Subject matter wherein the interfitting/claw-pole/lundel poles extend in the same axial direction with respect to the rotor.
  
[List of Patents for class 310 subclass 156.72]    156.72Additional support for magnet:
 This subclass is indented under subclass 156.66.  Subject matter wherein the rotor includes additional support for at least one permanent magnet, such as a support ring radially positioned between at least one permanent magnet and the interfitting/claw-pole/lundel poles.
  
[List of Patents for class 310 subclass 156.73]    156.73Additional support for claw pole tips:
 This subclass is indented under subclass 156.66.  Subject matter wherein the rotor includes additional support for the tips of the claw-poles/interfitting/lundel poles.
(1) Note. The term "claw pole" refers to magnetic poles formed on the rotor with interfitting poles which extend axially from a central structure.
  
[List of Patents for class 310 subclass 156.74]    156.74Damping features:
 This subclass is indented under subclass 156.01.  Subject matter including an electrical conductor to protect against demagnetization of at least one permanent magnet of the rotor.
  
[List of Patents for class 310 subclass 156.75]    156.75Damper plate on magnetic face:
 This subclass is indented under subclass 156.74.  Subject matter wherein the electrical conductor to protect against demagnetization of the permanent magnets of the rotor is a plate means provided on the face of the permanent magnet.
  
[List of Patents for class 310 subclass 156.76]    156.76Damper in pole pieces:
 This subclass is indented under subclass 156.74.  Subject matter wherein the electrical conductor is a damper winding positioned in pole shoes/pole pieces on the face of at least one permanent magnet.
  
[List of Patents for class 310 subclass 156.77]    156.77Damper cage around magnet:
 This subclass is indented under subclass 156.74.  Subject matter wherein the electrical conductor is a damper cage around the periphery of at least one permanent magnet.
  
[List of Patents for class 310 subclass 156.78]    156.78Squirrel cage:
 This subclass is indented under subclass 156.01.  Subject matter including a squirrel cage type winding on the rotor in addition to at least one permanent magnet.
  
[List of Patents for class 310 subclass 156.79]    156.79Including laminated ring:
 This subclass is indented under subclass 156.78.  Subject matter wherein the squirrel cage winding is formed in a laminated ring of magnetic material.
  
[List of Patents for class 310 subclass 156.81]    156.81Magnet positioned between squirrel cage and stator:
 This subclass is indented under subclass 156.78.  Subject matter wherein at least one permanent magnet of the rotor is positioned between the squirrel cage winding and a stator of the dynamoelectric machine.
  
[List of Patents for class 310 subclass 156.82]    156.82Axially positioned magnets:
 This subclass is indented under subclass 156.78.  Subject matter wherein at least one permanent magnet of the rotor of the dynamoelectric machine are axially positioned with respect to a magnetic core of the rotor.
  
[List of Patents for class 310 subclass 156.83]    156.83Including a flux barrier:
 This subclass is indented under subclass 156.78.  Subject matter wherein the squirrel cage type winding includes a feature to block or guide the magnetic flux in the rotor.
  
[List of Patents for class 310 subclass 156.84]    156.84Flux barrier is a magnet:
 This subclass is indented under subclass 156.83.  Subject matter wherein the flux barrier is an additional permanent magnet which is different from at least one permanent magnet of the rotor.
  
[List of Patents for class 310 subclass 157]    157
 This subclass is indented under subclass 40.  Subject matter which is vertically disposed.
  
[List of Patents for class 310 subclass 158]    158
 This subclass is indented under subclass 40.  Subject matter relating to universal motors which will operate with either alternating current or direct current sources.

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318Electricity: Motive Power Systems,   subclass 245 and 246+ for universal motor systems.
  
[List of Patents for class 310 subclass 159]    159
 This subclass is indented under subclass 40.  Subject matter relating to alternating current rotary dynamoelectric devices.
  
[List of Patents for class 310 subclass 160]    160
 This subclass is indented under subclass 159.  Subject matter relating to frequency converters.

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127+,for this subject matter having plural collectors.

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84Music,   subclasses 725+ for this subject matter in an electrical musical instrument, such as an electric organ.
191Electricity: Transmission to Vehicles,   subclass 7 for this subject matter in a distribution system utilized for transmitting electricity to a moving vehicle from a stationary point.
363Electric Power Conversion Systems,   subclasses 157+ , especially subclasses 174+ for this subject matter in a conversion system.
  
[List of Patents for class 310 subclass 161]    161
 This subclass is indented under subclass 159.  Subject matter relating to dynamoelectric machinery for shifting the phase of the alternating current.

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323Electricity: Power Supply or Regulation Systems,   subclasses 201 through 204for this subclass matter in a phase control system.
  
[List of Patents for class 310 subclass 162]    162
 This subclass is indented under subclass 159.  Subject matter relating to synchronous dynamoelectric machinery.

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318Electricity: Motive Power Systems,   subclasses 700+ for this subject matter in a synchronous motor system.
  
[List of Patents for class 310 subclass 163]    163
 This subclass is indented under subclass 162.  Subject matter of the reaction type.
  
[List of Patents for class 310 subclass 164]    164
 This subclass is indented under subclass 163.  Subject matter having a toroidal coil.
  
[List of Patents for class 310 subclass 165]    165
 This subclass is indented under subclass 162.  Subject matter having an electromagnetic coil which is adapted to be energized by direct current.
  
[List of Patents for class 310 subclass 166]    166
 This subclass is indented under subclass 159.  Subject matter of the induction motor or induction generator type.

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318Electricity: Motive Power Systems,   subclasses 727+ for induction motor systems.
322Electricity: Single Generator Systems,   subclass 47 for induction generator systems.
  
[List of Patents for class 310 subclass 167]    167
 This subclass is indented under subclass 166.  Subject matter having means to start a dynamoelectric machine, which is utilized as a motor, by the use of repulsion starting.

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318Electricity: Motive Power Systems,   subclasses 725+ for repulsion motor systems; and subclass 728 for repulsion start induction motor systems.
  
[List of Patents for class 310 subclass 168]    168
 This subclass is indented under subclass 166.  Subject matter relating to inductor type generators wherein the magnetic circuit is varied by varying the reluctance of said magnetic circuit.

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155,for this subject matter having a permanent magnet in the magnetic circuit.

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322Electricity: Single Generator Systems,   subclass 47 for induction type generator systems.
  
[List of Patents for class 310 subclass 169]    169
 This subclass is indented under subclass 168.  Subject matter relating to high frequency generators.
(1) Note. The high frequency is obtained, for example, by the use of saw tooth reluctance type rotor, which is rotated at a high rate of speed.
  
[List of Patents for class 310 subclass 170]    170
 This subclass is indented under subclass 169.  Subject matter relating to multi-frequency generators.
  
[List of Patents for class 310 subclass 171]    171
 This subclass is indented under subclass 166.  Subject matter relating to induction generators.
(1) Note. An induction generator is a synchronous motor which is either self excited by connecting a large condenser in its output circuit or by driving it above synchronous speed while connected to an energized circuit.
  
[List of Patents for class 310 subclass 172]    172
 This subclass is indented under subclass 166.  Subject matter relating to shifting field type induction motors.
(1) Note. This subclass relates, for example, to the shaded pole type of induction motor in which, although only a single phase of current is connected to the motor, a true rotating field is obtained by the use of pole faces which are partly free and partly surrounded by a short circuited coil.

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318Electricity: Motive Power Systems,   subclass 750 for reversing shaded pole induction motor systems; and subclasses 781+ for shaded pole induction motor systems.
  
[List of Patents for class 310 subclass 173]    173
 This subclass is indented under subclass 159.  Subject matter having a commutator.

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127+,for this subject matter having plural commutators.
167,for this subject matter in an induction motor.

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318Electricity: Motive Power Systems,   subclasses 725+ for repulsion motor systems and subclasses 244+ for other alternating current motor systems in which the motor has a commutator.
  
[List of Patents for class 310 subclass 174]    174
 This subclass is indented under subclass 173.  Subject matter for use with a single phase of alternating current.
  
[List of Patents for class 310 subclass 175]    175
 This subclass is indented under subclass 174.  Subject matter in which the armature windings are conductively connected to the source of energy.
  
[List of Patents for class 310 subclass 176]    176
 This subclass is indented under subclass 174.  Subject matter in which the armature winding is connected to the source of energy by means of transformer action.
  
[List of Patents for class 310 subclass 177]    177
 This subclass is indented under subclass 40.  Subject matter relating to direct current dynamoelectric machines.
  
[List of Patents for class 310 subclass 178]    178
 This subclass is indented under subclass 177.  Subject matter relating to homopolar dynamoelectric machines.
(1) Note. A homopolar dynamoelectric machine is one in which the moving armature conductor is not in the form of a coil, but is rather in the form of one half of a single turn. Generally, this is achieved by utilizing a disk or a cylinder as the coil with pairs of brushes to conduct the current from and to the conductor at spaced points.

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318Electricity: Motive Power Systems,   subclass 253 for homopolar motor systems.
322Electricity: Single Generator Systems,   subclass 48 for this subject matter utilized in a generator system.
  
[List of Patents for class 310 subclass 179]    179
 This subclass is indented under subclass 40.  Subject matter relating to windings and core structure.

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324Electricity: Measuring and Testing,   subclasses 76.11+ for the structure of integrating electric meters having a rotary portion which operates in the manner of an electric motor.
335Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,   subclasses 220+ for the structure of electromagnets.
336Inductor Devices,   appropriate subclasses for the structure of inductor and inductive reactors.
  
[List of Patents for class 310 subclass 180]    180
 This subclass is indented under subclass 179.  Subject matter relating to field or excitation windings or core structure.

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318Electricity: Motive Power Systems,   subclasses 521+ for electric motor systems having means to control the field.
  
[List of Patents for class 310 subclass 181]    181
 This subclass is indented under subclass 180.  Subject matter having a combined permanent and electromagnet.

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152+,for permanent magnet machines.

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322Electricity: Single Generator Systems,   subclass 46 for generator control systems in which the generator has a combined permanent and wound field structure.
335Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,   subclasses 229+ for devices with electromagnets combined with permanent magnets having an armature.
  
[List of Patents for class 310 subclass 182]    182
 This subclass is indented under subclass 180.  Subject matter having a short circuited winding or conductor.

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336Inductor Devices,   subclasses 73+ for inductive devices having closed coils or single conductor members (e.g., rings, bands, discs, etc., of conductive material).
  
[List of Patents for class 310 subclass 183]    183
 This subclass is indented under subclass 182.  Subject matter having a damper type winding.
(1) Note. A damper winding is a winding which acts to absorb higher frequencies of magnetic flux by ohmic dissipation or by the generation of induced currents which oppose the higher frequencies of flux.
  
[List of Patents for class 310 subclass 184]    184
 This subclass is indented under subclass 180.  Subject matter having plural field windings.

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322Electricity: Single Generator Systems,   subclasses 63+ for this subject matter in a single generator system.
363Electric Power Conversion Systems,   subclass 104 for this subject matter in combination with a significant electric conversion circuit.
  
[List of Patents for class 310 subclass 185]    185
 This subclass is indented under subclass 184.  Subject matter having plural sets of poles.
  
[List of Patents for class 310 subclass 186]    186
 This subclass is indented under subclass 184.  Subject matter in which one of the plural field windings is an interpole, compensating or neutralizing pole.

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185,for this subject matter when associated with plural independent sets of poles.

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318Electricity: Motive Power Systems,   subclasses 521+ for this subject matter in an electric motor system.
322Electricity: Single Generator Systems,   subclasses 64 through 66for this subject matter in a single generator system.
  
[List of Patents for class 310 subclass 187]    187
 This subclass is indented under subclass 184.  Subject matter having a slotted or divided pole.

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172,for split phase induction motors having a divided pole, one half of which is surrounded by a short circuiting conductor.
182+,for field structure having short circuited windings or conductors, some of which are set into slots in the pole faces.
  
[List of Patents for class 310 subclass 188]    188
 This subclass is indented under subclass 184.  Subject matter relating to differentially related field windings.
  
[List of Patents for class 310 subclass 189]    189
 This subclass is indented under subclass 180.  Subject matter in which the field coil has a variable length or a tapped winding.

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322Electricity: Single Generator Systems,   subclass 71 for this subject matter in a single generator system.
336Inductor Devices,   subclass 150 for inductor tap changing means.
388Electricity: Motor Control Systems,   subclasses 835+ for running-speed control systems in which the length of the field winding may be varied.
  
[List of Patents for class 310 subclass 190]    190
 This subclass is indented under subclass 180.  Subject matter having a magnetic shunt for shifting the field flux.

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335Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,   subclasses 220+ for miscellaneous magneto-mechanical devices which may utilize flux shunting means, see especially subclasses 236+.
336Inductor Devices,   subclass 133 and 160+ for inductive devices with adjustable magnetic shunts and inductive regulators with magnetic shunts, respectively.
  
[List of Patents for class 310 subclass 191]    191
 This subclass is indented under subclass 180.  Subject matter having adjustable magnetic structure.

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190,for the subject matter where the adjustable structure is a magnetic shunt.

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318Electricity: Motive Power Systems,   subclasses 538+ for electric motor systems in which the motor structure is controlled or adjusted. Consult the search notes to these classes for related art.
322Electricity: Single Generator Systems,   subclasses 49+ for a single generator system in which the magnetic structure of a generator is controlled or adjusted.
336Inductor Devices,   subclasses 132+ for inductive devices having plural core parts which are relatively adjustable.
  
[List of Patents for class 310 subclass 192]    192
 This subclass is indented under subclass 180.  Subject matter having nonmagnetic inserts or air gaps in the field or winding structure.

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336Inductor Devices,   subclasses 135+ , 165 and 178 for core structure with adjustable air gap, an air gap in the magnetic shunt of an inductive regulator and inductive devices having closed cores with air gaps, respectively.
  
[List of Patents for class 310 subclass 193]    193
 This subclass is indented under subclass 180.  Subject matter having a nonuniform core cross section.

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336Inductor Devices,   subclasses 155+ for inductive regulators of the saturable type having nonuniform core cross sections, where a part of the core, having a small cross section, saturates before other parts of the core, having larger cross sections, saturate.
  
[List of Patents for class 310 subclass 194]    194
 This subclass is indented under subclass 180.  Subject matter relating to coil supports and spools.

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336Inductor Devices,   subclass 185 and 208 for coil supports for plural coil windings and coils on preformed supports or mounts (for single coil windings), respectively.
  
[List of Patents for class 310 subclass 195]    195
 This subclass is indented under subclass 179.  Subject matter relating to armature or primary windings or core structure.

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324Electricity: Measuring and Testing,   subclasses 134+ for the structure of armatures utilized in integrating type electric meters.
  
[List of Patents for class 310 subclass 196]    196
 This subclass is indented under subclass 195.  Subject matter relating to the prevention of corona discharges.

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174Electricity: Conductors and Insulators,   subclasses 140+ for insulators having means to distribute a voltage stress along the insulator.
336Inductor Devices,   subclass 70 for coil capacitance modifying surge potential gradient modifying means.
361Electricity: Electrical Systems and Devices,   subclasses 212+ for the discharging of static electricity.
  
[List of Patents for class 310 subclass 197]    197
 This subclass is indented under subclass 195.  Subject matter having a short circuited winding or conductor.

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166+,for complete induction motors.

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336Inductor Devices,   subclasses 73+ for inductive devices having closed coils or single conductor members (e.g., rings, bands, discs, etc., of conductive material).
  
[List of Patents for class 310 subclass 198]    198
 This subclass is indented under subclass 195.  Subject matter having plural windings.

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318Electricity: Motive Power Systems,   subclasses 495+ for this subject matter in an electric motor system.
322Electricity: Single Generator Systems,   subclass 90 for this subject matter in a single generator system.
  
[List of Patents for class 310 subclass 199]    199
 This subclass is indented under subclass 198.  Subject matter relating to combined stationary and rotary windings.
  
[List of Patents for class 310 subclass 200]    200
 This subclass is indented under subclass 195.  Subject matter having a variable length or a tapped winding.

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322Electricity: Single Generator Systems,   subclass 93 for this subject matter in a single generator system.
336Inductor Devices,   subclasses 137+ for adjustable inductor having means to change the coil length or connections. Note especially indented subclass 150 for that subject matter having tap changing means. Also see subclass 15 for inductive devices with variable length coils, whose length varies through winding and/or unwinding of the coil.
  
[List of Patents for class 310 subclass 201]    201
 This subclass is indented under subclass 195.  Subject matter in which the winding conductors are in the form of bars.
  
[List of Patents for class 310 subclass 202]    202
 This subclass is indented under subclass 195.  Subject matter in which the winding conductors are in the form of open windings.
(1) Note. An open winding is a winding of the type in which, starting from a given point, it is not possible to reach that given point again by continuously going along the winding in only one direction.
  
[List of Patents for class 310 subclass 203]    203
 This subclass is indented under subclass 195.  Subject matter relating to closed windings.
(1) Note. A closed winding is a winding of such type that it is possible to arrive at any point by leaving that point and traversing the winding continuously in only one direction.
  
[List of Patents for class 310 subclass 204]    204
 This subclass is indented under subclass 203.  Subject matter relating to equalizers or equalizer windings.
  
[List of Patents for class 310 subclass 205]    205
 This subclass is indented under subclass 203.  Subject matter relating to multiplex windings.
  
[List of Patents for class 310 subclass 206]    206
 This subclass is indented under subclass 203.  Subject matter relating to lap windings.
  
[List of Patents for class 310 subclass 207]    207
 This subclass is indented under subclass 203.  Subject matter relating wave windings.
  
[List of Patents for class 310 subclass 208]    208
 This subclass is indented under subclass 195.  Subject matter relating to coils.

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194,for similar subject matter.
  
[List of Patents for class 310 subclass 209]    209
 This subclass is indented under subclass 195.  Subject matter relating to adjustable magnetic structure.

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318Electricity: Motive Power Systems,   subclasses 538+ for the subject matter in electric motor systems.
322Electricity: Single Generator Systems,   subclasses 49+ for this subject matter in a single generator system.
336Inductor Devices,   subclasses 132+ for inductive devices having plural core parts which are relatively adjustable.
  
[List of Patents for class 310 subclass 210]    210
 This subclass is indented under subclass 179.  Subject matter relating to secondary windings or conductors.
(1) Note. A secondary winding or conductor is one in which current is induced by transformer action.
  
[List of Patents for class 310 subclass 211]    211
 This subclass is indented under subclass 210.  Subject matter relating to squirrel cage type secondary windings.
  
[List of Patents for class 310 subclass 212]    212
 This subclass is indented under subclass 211.  Subject matter having inherently variable impedance at variable frequencies.
(1) Note. This subclass relates, for example, to squirrel cage rotors in which the rotor bars are in the form of ribbons, set in deep slots so that the inductive reactance of the different portions of a ribbon are different. This subclass also relates, for example, to double squirrel cage type rotors.
  
[List of Patents for class 310 subclass 213]    213
 This subclass is indented under subclass 179.  Subject matter relating to antiparasitic conductors.
(1) Note. This subclass relates, for example, to the elimination of skin current effects in dynamoelectric machine windings; in which, due to the action of different inherent reactances in different parts of a common conductor the current is caused to concentrate in one part of the conductor with resulting excess heating. Such current concentration and excess heating can be avoided, for example, by dividing these conductors into a plurality of parallel members which are twisted about each other and insulated from each other everywhere except by their ends, where they are conductively joined.

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174Electricity: Conductors and Insulators,   subclass 114 for split or imbricated conductors, per se.
  
[List of Patents for class 310 subclass 214]    214
 This subclass is indented under subclass 179.  Subject matter relating to coil retainers or slot closers.

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216.099through 216.103, for a magnetic element for bridging adjacent pole ends.

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428Stock Material or Miscellaneous Articles,   subclasses 544+ for stock materials, e.g., of indefinite length, which are all metal or have adjacent metal components.
  
[List of Patents for class 310 subclass 215]    215
 This subclass is indented under subclass 179.  Subject matter relating to slot liners.

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336Inductor Devices,   subclasses 196+ for inductor devices (e.g., transformers and inductive reactors) having supporting or spacing means between coil and core.
  
[List of Patents for class 310 subclass 216.001]    216.001Core:
 This subclass is indented under subclass 179.  Subject matter including specific structural detail of an element comprising a ferromagnetic material for concentrating magnetic flux along a low-reluctance flux path.
(1) Note. The core is commonly inductively coupled with a source of magnetic energy, and directs the flux from the source along a predetermined path in a motor or generator where the energy interacts with other elements of the machine to produce motion or electrical energy.

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336Inductor Devices,   subclasses 210 through 213, 216-219, 233, and 234 for magnetic core structure for use in an inductor, of which subclasses 233 and 234 is the general subclass for a core not elsewhere classified.
  
[List of Patents for class 310 subclass 216.002]    216.002Pole-less core (i.e., slotless, toothless):
 This subclass is indented under subclass 216.001.  Subject matter including a magnetic core accommodating a winding thereon, the core lacking any pole extending therefrom.
(1) Note. The winding is commonly placed against a smooth-surfaced core instead of wound around a core extension or tooth.
  
[List of Patents for class 310 subclass 216.003]    216.003Wire core:
 This subclass is indented under subclass 216.001.  Subject matter including a core comprised of an elongated slender rod or filament of magnetic material that is wound or coiled in plural turns, or bunched together in a manner sufficient to build the desired core cross-section.

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216.004through 216.066, for laminated core structure.
  
[List of Patents for class 310 subclass 216.004]    216.004Laminated core:
 This subclass is indented under subclass 216.001. Subject matter including a core constructed of a plurality of superposed, thin layers (i.e., sheets) of magnetic material joined together into a unitary structure.
(1) Note. The plurality of layers may be formed from plural sheets of material superposed on one another, or a single sheet of material folded or wound on itself to form plural superposed layers.

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216.03,for a wire core.
216.057through 216.063, for a laminated pole.
216.064,for a laminated pole tip.

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336Inductor Devices,   subclass 210 for an inductor core structure with means for fastening plural parts of the core or the core laminations into a single integral core; and subclass 213, for an inductor core structure formed of a continuous, wound strip or filament of magnetic material.
  
[List of Patents for class 310 subclass 216.005]    216.005Having winding lead accommodation structure:
 This subclass is indented under subclass 216.004.  Subject matter including a laminated core with a means in the form of a recess, slot, channel or other passage on or through a portion of the core, for the specific purpose of containing an electrical conductor (i.e., lead) extending from a winding associated with the core.
  
[List of Patents for class 310 subclass 216.006]    216.006Having particular grain orientation:
 This subclass is indented under subclass 216.004.  Subject matter including a laminated core having a lamination comprised of a sheet of ferromagnetic material having magnetic crystals (i.e., grains) aligned in generally the same direction or in a predetermined directional pattern, or a specified relationship of a crystal orientation of one lamination with respect to that of another lamination.
  
[List of Patents for class 310 subclass 216.007]    216.007Plural laminated segments radially united:
 This subclass is indented under subclass 216.004.  Subject matter including at least two distinct sets of laminated core sections combined to form the core, wherein one section is positioned at a greater distance from the rotor axis than the other core section.
(1) Note. The core sections are commonly comprised of, for example, annular shaped sections of increasing diameter, wherein the sections are joined together generally along a circumferential border of each section having a common radius with the other section.
  
[List of Patents for class 310 subclass 216.008]    216.008Plural axially laminated segments circumferentially united:
 This subclass is indented under subclass 216.004.  Subject matter including at least two distinct sets of laminated core sections combined to form the core, each section having laminations stacked in a direction parallel to the rotor axis, wherein one section is generally positioned at a similar distance from the rotor axis as the other core section, and joined to the other core section along a boundary in common with a radial line directed away from the rotor axis.
(1) Note. This subclass includes, for example, two axially-laminated C-core sections united face-to-face at their respective open ends; but it is not so limited to only two such arcuate sections joined together to form the core.
  
[List of Patents for class 310 subclass 216.009]    216.009Having particular mating joint structure:
 This subclass is indented under subclass 216.008.  Subject matter including a core having a plurality of axially laminated sections circumferentially united, wherein there is a recited structural detail of the connection between the two sections.
  
[List of Patents for class 310 subclass 216.011]    216.011Circumferentially offset laminations:
 This subclass is indented under subclass 216.004.  Subject matter including a laminated core having a plurality of laminations having a common structural feature, wherein the laminations are stacked in such a way that the feature in one of the laminations is not axially aligned with the like feature in the other lamination.
(1) Note. A laminated structure in this subclass commonly has similar laminations, where each lamination is rotated in the plane of the lamination with respect to the like feature of a mating lamination. However, it is not required that the laminations be identical.
  
[List of Patents for class 310 subclass 216.012]    216.012Offset pole teeth:
 This subclass is indented under subclass 216.011.  Subject matter including a laminated core including a lamination having a radially extending pole tooth as the common structural feature that is circumferentially offset from a corresponding pole tooth in a mating lamination.
  
[List of Patents for class 310 subclass 216.013]    216.013Having axially extended spirally-laminated core:
 This subclass is indented under subclass 216.011.  Subject matter including a laminated core wherein a lamina is helically wound both around and along an axis along a path similar to a screw thread, so that laminations formed by each turn are stacked in the axial direction of the axis.
(1) Note. The common structural feature is commonly formed at a plurality of positions on the lamina, wherein the distance between common features is such that the common features of adjacent turns do not axially align with one another after the lamina is wound into a core.

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216.041,through 216.044, for an axially extending spiral lamination.
216.046,and 216.047, for having radially stacked laminations by spiral winding.
  
[List of Patents for class 310 subclass 216.014]    216.014Offset cooling fins:
 This subclass is indented under subclass 216.011.  Subject matter including a laminated core including a lamination including a portion with a ventilation passage there through as the common structural feature that is circumferentially offset from a corresponding ventilation passage in a mating lamination.

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12.29,for cooling of a linear motor or generator.
16,for cooling of a reciprocating motor or generator.
52through 65, for of a rotary dynamoelectric machine, especially subclass 64, for a heat exchange structure in a dynamoelectric machine.
58+,for general cooling in a dynamoelectric machine by circulation of a cooling fluid, especially subclass 64, for a heat exchange structure in a dynamoelectric machine.
216.056,for a cooling fin defining an outer peripheral shape of a laminated core.
216.119,for a cooling channel in the end ring of a core of a rotary dynamoelectric machine.
227,for current collector cooling in a rotary dynamoelectric machine.
417,for a rotary dynamoelectric machine end shield having ventilation holes.

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165Heat Exchange,   subclass 185 for a heat exchanger fin, per se.
  
[List of Patents for class 310 subclass 216.015]    216.015Plural diverse elements:
 This subclass is indented under subclass 216.004. Subject matter including a laminated core constructed of more than one element or section of distinct or unlike form or qualities.
(1) Note. The unlike form or qualities may be among differences in shape, size, or material, etc., but is not so limited; and/or may include a core section that is not laminated, for example.
  
[List of Patents for class 310 subclass 216.016]    216.016Diverse laminations:
 This subclass is indented under subclass 216.015.  Subject matter including a laminated core in which the diverse elements are dissimilar laminations.
(1) Note. The plural different laminations may be diverse in their shapes, size or material.

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216.017,for a laminated core having both magnetic and nonmagnetic laminations.
  
[List of Patents for class 310 subclass 216.017]    216.017Magnetic and nonmagnetic laminations:
 This subclass is indented under subclass 216.016. Subject matter including a laminated core in which the diverse elements are a lamination of magnetic material and a lamination of non-magnetic material.
(1) Note. The magnetic and nonmagnetic laminated sheets may be stacked in an alternating sequence, or a portion of the laminated core may be formed by a group of laminated sheets of material that differs from the material in a different portion of the core.

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216.016,for a laminated core having diverse laminations other than magnetic/nonmagnetic differences.
  
[List of Patents for class 310 subclass 216.018]    216.018Different thicknesses:
 This subclass is indented under subclass 216.016.  Subject matter including a laminated core having a plurality of laminations that include a lamination of a first thickness and a lamination of a second thickness different from the first thickness.
  
[List of Patents for class 310 subclass 216.019]    216.019Having diverse shapes to accommodate coil contour:
 This subclass is indented under subclass 216.016.  Subject matter including a laminated core formed with a plurality of laminations, wherein at least one of the laminations is shaped differently than at least one of the other laminations in an area where a winding is positioned, to provide a winding engaging surface that is variously shaped to mirror that of a varying surface shape of, or any bends in, the winding.
  
[List of Patents for class 310 subclass 216.021]    216.021E-shaped:
 This subclass is indented under subclass 216.004.  Subject matter including a core formed of stacked laminations, wherein the peripheral shape of the lamination sheets, and that of the resulting core formed therefrom, resembles the letter "E" of the alphabet.

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216.023through 216.039 , for a C- or U-shaped laminated core.
216.055,and 216.056, for a laminated core having a particular outer peripheral shape.
  
[List of Patents for class 310 subclass 216.022]    216.022Having winding on center leg and magnetically coupled poles:
 This subclass is indented under subclass 216.021.  Subject matter including a laminated E-shaped core having a winding wound around the center extension, wherein the two outer extensions are magnetically connected.
(1) Note. The core may be comprised, for example, of two E-type cores arranged face-to-face in a mirror image arrangement where the two outer extensions are mechanically or magnetically connected to one another, with a winding around each respective center extension.
  
[List of Patents for class 310 subclass 216.023]    216.023C- or U-shaped core:
 This subclass is indented under subclass 216.  004. Subject matter including a core formed of stacked laminations, wherein the peripheral shape of the laminations, and that of the resulting core formed therefrom, resembles the letter "C" or "U" of the alphabet, or having two side legs extending from each end of an arcuate section or "middle bend."
(1) Note. Each lamination may include plural sections, so long as the sections combined in each lamination layer resembles the letter "C" or "U", such as found in a split core that, when unified, resembles said letters.

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216.021,and 216.022, for an E-shaped laminated core.
216.055,and 216.056, for a laminated core having a particular outer peripheral shape.
  
[List of Patents for class 310 subclass 216.024]    216.024Plural cores unified by magnetic coupling between poles, with a winding around the middle bend of each core:
 This subclass is indented under subclass 216.023.  Subject matter including more than one C- or U-shaped core, where the poles of each core are magnetically coupled to the poles of the other core to connect the cores together into a unitary core, and a winding is located around the middle bend portion of each core.

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216.026,for two unified C- or U-shaped cores magnetically coupled together.
216.027,for similar structure in which structural coupling between poles is performed by a non-magnetic material.
216.032,for two unified C- or U-shaped cores coupled at the poles via a spring.
  
[List of Patents for class 310 subclass 216.025]    216.025Two cores:
 This subclass is indented under subclass 216.024.  Subject matter wherein the number of plural cores is two.

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216.026,for two unified C- or U-shaped cores magnetically coupled together.
216.027,for similar structure in which structural coupling between poles is performed by a non-magnetic material.
216.032,for two unified C- or U-shaped cores coupled at the poles via a spring.
  
[List of Patents for class 310 subclass 216.026]    216.026Two cores unified by magnetic coupling between poles, with a winding on each side leg of each core:
 This subclass is indented under subclass 216.23.  Subject matter including two C- or U-shaped cores, where the poles of each core are magnetically coupled to the poles of the other core to connect the cores together into a unitary core, and a winding is located around on each side leg of each core.

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216.025,for two unified C- or U-shaped cores magnetically coupled together.
216.027,for similar structure in which structural coupling between poles is performed by a non-magnetic material.
216.032,for two unified C- or U-shaped cores coupled at the poles via a spring.
  
[List of Patents for class 310 subclass 216.027]    216.027Two cores unified by structurally coupled poles, with a winding around the middle bend of each core:
 This subclass is indented under subclass 216.023.  Subject matter including two C- or U-shaped cores, where the poles of each core are structurally coupled to the poles of the other core to connect the cores together into a unitary core, and a winding is located around the middle bend portion of each core.

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216.025,for two unified C- or U-shaped cores magnetically coupled together.
216.026,for two unified C- or U-shaped cores magnetically coupled together.
216.032,for two unified C- or U-shaped cores coupled at the poles via a spring.
  
[List of Patents for class 310 subclass 216.028]    216.028Having centrally-supported arcuate pole and a winding around each end of pole:
 This subclass is indented under subclass 216.023.  Subject matter including a C- or U-shaped core having a pole having a curved shape, and is supported from the core at a point between the two ends of the curve such that the pole has two portions extending from said point, and a winding is placed on each extension.

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216.029,for a core having plural unified C- or U-shaped cores and a pole winding.
  
[List of Patents for class 310 subclass 216.029]    216.029Plural unified cores having a pole winding:
 This subclass is indented under subclass 216.023.  Subject matter including more than one C- or U-shaped core combined into a single core structure, having at least one pole with a winding located thereon.

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216.028,for a C- or U-shaped core having a centrally supported arcuate pole, and a winding around each end of pole.
  
[List of Patents for class 310 subclass 216.031]    216.031Two cores:
 This subclass is indented under subclass 216.029.  Subject matter wherein the number of plural cores is two.
  
[List of Patents for class 310 subclass 216.032]    216.032Two cores unified by a joint spring coupling between poles:
 This subclass is indented under subclass 216.023.  Subject matter including two C- or U-shaped cores, where the poles of each core are structurally coupled to the poles of the other core to connect the cores together into a unitary core, wherein the means for structurally coupling is a resilient or elastic member.

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216.025,for two unified C- or U-shaped cores magnetically coupled together.
216.026,for two unified C- or U-shaped cores magnetically coupled together.
216.027,for similar structure in which structural coupling between poles is performed by a non-magnetic material.
  
[List of Patents for class 310 subclass 216.033]    216.033Having winding around middle bend of core:
 This subclass is indented under subclass 216.023.  Subject matter including a single C- or U-shaped core having a winding placed around the middle bend of the core.
  
[List of Patents for class 310 subclass 216.034]    216.034Having magnetically coupled poles:
 This subclass is indented under subclass 216.033.  Subject matter including a single C- or U-shaped laminated magnetic core having a winding wound around the center portion thereof, and magnetic material connected between the "open" ends of the C or U shape.
(1) Note. The "open" end of the C or U shape commonly defines two poles facing one another. The magnetic material connected between the "open" ends may be fastened to the "open" ends, or integrally formed with the C- or U-shaped core.
  
[List of Patents for class 310 subclass 216.035]    216.035Double-section core:
 This subclass is indented under subclass 216.033.  Subject matter including a single C- or U-shaped core having a winding placed around the middle bend of the core, where the core comprises two sections joined together into a unitary core.
  
[List of Patents for class 310 subclass 216.036]    216.036Having winding around core side leg:
 This subclass is indented under subclass 216.023.  Subject matter including a single C- or U-shaped core having a winding placed around a side leg of the core.
  
[List of Patents for class 310 subclass 216.037]    216.037Winding around each side leg:
 This subclass is indented under subclass 216.036.  Subject matter including a single C- or U-shaped core having a winding placed around each side leg of the core.
  
[List of Patents for class 310 subclass 216.038]    216.038Core side legs extend along rotor axis:
 This subclass is indented under subclass 216.023.  Subject matter including a C- or U-shaped core positioned in relation to a rotor such that the legs are arranged to extend in the same general direction as the rotary axis of the rotor.
  
[List of Patents for class 310 subclass 216.039]    216.039Core middle bend extends along rotor axis:
 This subclass is indented under subclass 216.023.  Subject matter including a C- or U-shaped core positioned in relation to a rotor such that the middle bend of the core is arranged to extend in the same general direction as the rotary axis of the rotor.
(1) Note. The middle bend of the core may be "stretched" or elongated to extend the distance of the rotor s length, with the core side legs positioned at respective axial ends of the rotor.
  
[List of Patents for class 310 subclass 216.041]    216.041Having axially extended spiral lamination:
 This subclass is indented under subclass 216.004.  Subject matter including a laminated core wherein a lamina is helically wound both around and along an axis along a path similar to a screw thread, so that laminations formed by each turn are stacked in the axial direction of the axis.

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216.013,for an axially extending spirally-wound core with offset laminations.
216.047,for a radially-stacked, spirally-wound core having an axially-extended spiral-wound pole.
  
[List of Patents for class 310 subclass 216.042]    216.042Having machined poles:
 This subclass is indented under subclass 216.041.  Subject matter including an axially extending spiral wound core, wherein poles are cut, ground, or otherwise machined into the laminated core.
  
[List of Patents for class 310 subclass 216.043]    216.043Having bending notch:
 This subclass is indented under subclass 216.041.  Subject matter including a cut or nick in the edge of the lamina arranged to relieve stress in the lamina and allow it to more easily adapt to its desired axially extending spiral shape.
  
[List of Patents for class 310 subclass 216.044]    216.044Having inter-layer mating projection and recess:
 This subclass is indented under subclass 216.041.  Subject matter including an axially extended spiral lamination that includes at least one depression, groove or other form of recessed area (i.e., recess) constructed and arranged to matingly receive a protruding element (i.e., projection) located on another area of the lamination, the recess and projection being further located with respect to one another along the lamination such that, when the lamination is wound, the adjacent laminations are secured in their wound position.

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216.048,for a radially laminated core with mating interfitting structure on the face of a lamination.
216.065,for a core having laminations secured by a bonding agent.
  
[List of Patents for class 310 subclass 216.045]    216.045Radially stacked:
 This subclass is indented under subclass 216.004.  Subject matter including a laminated core in which the laminations are built up in a radial direction with respect to the axial direction of the core.
(1) Note. When stacked in this manner, the edges of the laminations are substantially parallel to one another, with each edge generally extending along parallel paths of different radiuses from one another.

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216.062,for a radially laminated pole.
  
[List of Patents for class 310 subclass 216.046]    216.046Spirally wound:
 This subclass is indented under subclass 216.045.  Subject matter including a radially stacked laminated core in which the stacking in the radial direction comprises a thin magnetic sheet coiled about an axis in continuous layers of increasing distance away from the axis.

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216.054,for a non-planer core lamination.
  
[List of Patents for class 310 subclass 216.047]    216.047Having axially-extended spiral-wound pole:
 This subclass is indented under subclass 216.046.  Subject matter including a spiral-wound core having at least one spiral-wound pole projecting away from the core in a direction parallel to the rotor axis.
(1) Note. The spiral-wound pole may be separately spirally wound from and attached to the core, or it may be formed by slots cut into an axial end face of a spirally wound core.

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216.013,for a laminated core having circumferentially offset laminations using an axially-extended spirally-wound lamination.
216.041,for a laminated core having an axially-extended spiral lamination.
  
[List of Patents for class 310 subclass 216.048]    216.048Having interlamina mating structure on lamina face:
 This subclass is indented under subclass 216.004.  Subject matter including a projection or recess on a broad surface of a lamination (i.e., face) constructed and arranged to engage with a corresponding recess or projection, respectively, on an adjacent lamination to secure the laminations together into a unitary core.

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216.044,for a mating projection and recess for securing laminations in an axially-extending spirally wound core.
216.049through 216.052, for a laminated core having a lamination with a mounting ear.
216.065,for a core having structure for binding the core together into a unified core.
  
[List of Patents for class 310 subclass 216.049]    216.049Having a lamination including a radially extending mounting projection (e.g., mounting ear):
 This subclass is indented under subclass 216.004.  Subject matter including a laminated core having at least one lamination having an integral structural extension that extends perpendicularly away from the rotor axis, for securing the laminated core to a core-supporting structure.

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216.113,for a core having a supporting means.
433,for a frame having an axial tie-bar dovetailed to a core for supporting the core.
  
[List of Patents for class 310 subclass 216.051]    216.051Dovetail projection:
 This subclass is indented under subclass 216.049.  Subject matter including a laminated core having at least one lamination having a radially extending projection having a flared shape (e.g., dovetail) serving as a tenon that mates and interlocks with a corresponding mortise in the core-supporting structure.

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433,for a frame having an axial tie-bar dovetailed to a core for supporting the core.
  
[List of Patents for class 310 subclass 216.052]    216.052Provided only on partial number of laminations:
 This subclass is indented under subclass 216.049.  Subject matter including a laminated core having a plurality of laminations with less than the full set of the laminations having a radially extending mounting projection; i.e., at least one lamination of the plurality lacks a radial projection.
  
[List of Patents for class 310 subclass 216.053]    216.053Having integral spider (e.g., spokes):
 This subclass is indented under subclass 216.004.  Subject matter including a laminated core having a lamination including a main body portion having structurally unified radially-directed spokes extending therefrom for supporting the main body portion from a shaft.

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216.121,for a structure for supporting a core from a shaft.
420,for a frame having a spider mounted to a shaft.
  
[List of Patents for class 310 subclass 216.054]    216.054Non-planar lamination (e.g., wavy):
 This subclass is indented under subclass 216.004.  Subject matter including lamination sheets stacked into a unitary core, wherein the surface of each sheet is a shape other than significantly flat.
(1) Note. Significantly flat refers to the general overall shape of the surface, which may include, for example, projections or recesses on the surface for interlocking with adjacent laminations, etc., and still be considered significantly flat.

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216.013,for a spirally wound laminated core with circumferentially offset laminations.
216.046,and 216.047, for a radially-stacked spirally wound laminated core.
  
[List of Patents for class 310 subclass 216.055]    216.055Having a particular outer peripheral shape:
 This subclass is indented under subclass 216.004.  Subject matter including a laminated core having a specifically recited geometrical form or contour associated with its external perimeter.

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12.26,for a linear motor having a magnet or pole structure have a particular shape.
49.16,for a stepping motor with interfitting poles of a particular shape.
216.021,and 216.022, for an E-shaped laminated core.
216.023through 216.039, for a C-or U-shaped laminated core.
216.069through 216.073, for a core having a slot of a particular shape or with plural diverse pole shapes.
216.097,for a pole tip having a particular dimension.
216.111,and 216.112, for a core having a particular dimension.
  
[List of Patents for class 310 subclass 216.056]    216.056Cooling fin:
 This subclass is indented under subclass 216.055.  Subject matter including wherein the outer peripheral shape includes a shape having a high surface-area to volume ratio for the purpose of efficiently dissipating heat from the core to a surrounding medium.

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16,for cooling of a reciprocating motor or generator.
12.29,for cooling of a linear dynamoelectric machine.
52through 65, for cooling of a rotary dynamoelectric machine, especially subclass 64 for a heat exchange structure in a dynamoelectric machine.
216.014,for a cooling fin on a laminated core having cumferentially offset laminations.
216.119,for a cooling channel in the end ring of a core of a rotary dynamoelectric machine.
227,for current collector cooling in a rotary dynamoelectric machine.
417,for a rotary dynamoelectric machine end shield having ventilation holes.

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165Heat Exchange,   subclass 185 for a heat exchanger fin, per se.
  
[List of Patents for class 310 subclass 216.057]    216.057Laminated pole:
 This subclass is indented under subclass 216.004.  Subject matter including a pole, per se, constructed of a plurality of superposed, thin layers of magnetic material joined together into a unitary structure.
(1) Note. The plurality of layers may be formed from plural sheets of material superposed on one another, or a single sheet of material folded or wound on itself to form plural superposed layers.
(2) Note. The laminated pole may be attached or attachable to a core body that is either laminated or non-laminated.

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216.064,for a laminated pole tip.
216.074through 216.105, for non-laminated pole structure.
  
[List of Patents for class 310 subclass 216.058]    216.058Securing means:
 This subclass is indented under subclass 216.057.  Subject matter including a specific recitation of an element or structure for holding the superposed sheets together into a unified or integral structure.

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216.065,for a laminated core having a bonding agent between laminations.
216.113through 216.137, for core securing means for supporting a core, or holding it together into an integral unit.
  
[List of Patents for class 310 subclass 216.059]    216.059Alternating laminations:
 This subclass is indented under subclass 216.057.  Subject matter including a laminated pole constructed of a plurality of groups of laminations that are superposed on each other in alternating layers.
  
[List of Patents for class 310 subclass 216.061]    216.061Circumferentially stacked:
 This subclass is indented under subclass 216.057.  Subject matter including a laminated pole in which the laminations are built up (i.e., stacked) along a generally radial arc or portion of a circle having the axis of rotor rotation at the center.
(1) Note. When stacked in this manner, the edges of the laminations are substantially parallel to one another, with each edge generally extending along a radial line extending from the axis of rotation.
  
[List of Patents for class 310 subclass 216.062]    216.062Radially stacked:
 This subclass is indented under subclass 216.057.  Subject matter including a laminated pole in which the laminations are built up in a radial direction with respect to the intended axis of rotation of the motor or generator containing the core.
(1) Note. When stacked in this manner, the edges of the laminations are substantially parallel to one another, with each edge extending along generally parallel paths of different radiuses from the axis of rotation.

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216.045,for a radially stacked core.
  
[List of Patents for class 310 subclass 216.063]    216.063Wound lamination:
 This subclass is indented under subclass 216.057.  Subject matter including a laminated pole wherein the plurality of superposed layers are formed by a thin sheet of material turned or coiled about itself so that each turn is superposed on a previous turn.
  
[List of Patents for class 310 subclass 216.064]    216.064Laminated pole tip (e.g., shoe):
 This subclass is indented under subclass 216.057.  Subject matter including a laminated core having a particularly recited detail of a pole end face structure, or having a member (e.g. shoe) added to an end of a pole, wherein the added member is constructed of a plurality of superposed, thin layers of magnetic material joined together into a unitary structure.

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216.091,for non-laminated pole tip structure.
  
[List of Patents for class 310 subclass 216.065]    216.065Adhesively bonded laminations:
 This subclass is indented under subclass 216.004.  Subject matter wherein the core laminations are secured together as an integral body via a sticking or adhering material placed between the laminations.

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216.044,for an axially-extended spirally wound core having an inter-layer mating projection and recess.
216.048,for a radially stacked laminated core having inter-layer mating structure on the face of a lamination.
216.137,for a bonding agent used to fix a core to a support structure or for fixing a core together as an integral body.
  
[List of Patents for class 310 subclass 216.066]    216.066Homogeneous core or yoke (e.g., solid core):
 This subclass is indented under subclass 216.001.  Subject matter including a core or yoke formed from a ferromagnetic material having a substantially uniform structure or composition throughout the core.

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216.004through 216.013, for a laminated core.
  
[List of Patents for class 310 subclass 216.067]    216.067Molded magnetic powder resin:
 This subclass is indented under subclass 216.066.  Subject matter including a homogenous core or yoke constructed of a mass of magnetic particles dispersed in a resin binder, and formed into a single, solid mass of desired shape.
  
[List of Patents for class 310 subclass 216.068]    216.068Reshaped magnetic element (e.g., bent sheet):
 This subclass is indented under subclass 216.066.  Subjected matter including a homogenous core or yoke constructed from a volume of ferromagnetic material that is bent, twisted, or otherwise forcibly rearranged from an initial shape into a final core shape.
  
[List of Patents for class 310 subclass 216.069]    216.069Having slot of particular shape:
 This subclass is indented under subclass 216.001.  Subject matter including a core have a groove or channel (i.e., slot) for accommodating a winding therein, wherein there is recited a specific detail of the slot s geometrical or spatial form or contour.
(1) Note. The slot commonly houses or provides a location to accommodate a winding.

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216.111,for a core having a particular dimension.
216.096,for a pole tip having an asymmetric shape.
216.097,for a pole tip having a particular dimension.
  
[List of Patents for class 310 subclass 216.071]    216.071Plural diverse slot shapes:
 This subclass is indented under subclass 216.069.  Subject matter including a core having more than one slot, wherein at least one slot has a different shape than at least one other slot.
  
[List of Patents for class 310 subclass 216.072]    216.072With plural diverse pole widths:
 This subclass is indented under subclass 216.071.  Subject matter including a core having plural diverse slot shapes, and further includes more than one pole, wherein at least one pole has a different width than at least one other pole.
  
[List of Patents for class 310 subclass 216.073]    216.073With plural diverse pole shapes:
 This subclass is indented under subclass 216.069.  Subject matter including a core having a slot with a particular shape, and further includes more than one pole, wherein at least one pole has a different geometrical or spatial form or contour than at least one other pole.
  
[List of Patents for class 310 subclass 216.074]    216.074Pole structure:
 This subclass is indented under subclass 216.001.  Subject matter including a specifically recited detail of a core’s pole structure.

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216.057through 216.064 , for laminated pole structure.
216.112,for a core having a particular pole pitch.
  
[List of Patents for class 310 subclass 216.075]    216.075Particular to switch reluctant machine:
 This subclass is indented under subclass 216.074.  Subject matter including a pole having a particular structural feature specifically adapted for use in a stator or rotor core of a switch reluctant type dynamoelectric machine.
  
[List of Patents for class 310 subclass 216.076]    216.076Having integral flux shunt:
 This subclass is indented under subclass 216.074.  Subject matter including a core pole having a means included therein for diverting flux from a direct path between the opposite ends of the pole.
(1) Note. The shunt is commonly a means of establishing a higher reluctance area than the surrounding pole material.
  
[List of Patents for class 310 subclass 216.077]    216.077Via hole:
 This subclass is indented under subclass 216.076.  Subject matter including a pole with an integral flux shunt comprised of an opening in the pole material that defines a higher reluctance flux path than the core material.
  
[List of Patents for class 310 subclass 216.078]    216.078Pivotally mounted (e.g., hinged):
 This subclass is indented under subclass 216.074.  Subject matter including a core with a pole that is mounted on the core in such a manner that is can be turned or swiveled from one position to another, as by a hinge, or the pole is mounted on a core section adapted for similar movement with respect to another core section.
  
[List of Patents for class 310 subclass 216.079]    216.079Removable pole:
 This subclass is indented under subclass 216.074.  Subject matter including a pole constructed and arranged to be separable from the remainder of the core.

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216.098,for a pole tip that is removable from the remainder of the pole.
  
[List of Patents for class 310 subclass 216.081]    216.081Having intermediate spacer:
 This subclass is indented under subclass 216.079.  Subject matter including an element mounted between the removable pole and core that positions the pole out of direct abutment with the core when fixed to the core.
  
[List of Patents for class 310 subclass 216.082]    216.082Having wedge between pole and core:
 This subclass is indented under subclass 216.079.  Subject matter including a core having at least one removable pole that includes a tapered element forcibly inserted between the removable pole and the core.
  
[List of Patents for class 310 subclass 216.083]    216.083Having threaded fastener (e.g., screw):
 This subclass is indented under subclass 216.079.  Subject matter including a means for removably fixing the pole to the core that comprises an elongated element including a spiral groove around the circumference of the element, wherein the elongated element bridges a portion of the pole and a portion of the core.

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216.127,for a core secured by a threaded fastener.
  
[List of Patents for class 310 subclass 216.084]    216.084With mating female threaded fastener element (e.g., bolt):
 This subclass is indented under subclass 216.083.  Subject matter including a threaded fastener for attaching a removable pole, wherein the threaded fastener includes a male-threaded fastener that is threadable into a female-threaded fastener separate and distinct from the pole or core.
  
[List of Patents for class 310 subclass 216.085]    216.085Fastened through pole flange:
 This subclass is indented under subclass 216.083.  Subject matter including a removable pole having a projecting rim or extension (i.e., flange) through which a threaded fastener is positioned and utilized to removably fix the pole to the core.
  
[List of Patents for class 310 subclass 216.086]    216.086Dovetail connection:
 This subclass is indented under subclass 216.079.  Subject matter including a removable pole having a flared tenon extending therefrom that is mateable with a mortise or other means on the core for removably holding the pole via engagement between the mortise and the tenon.
  
[List of Patents for class 310 subclass 216.087]    216.087Having auxiliary bias force element:
 This subclass is indented under subclass 216.086.  Subject matter including a dovetailed removable pole, wherein the means for removably fastening the pole to the core includes means for applying pressure against the dovetail to aid in holding or maintaining the dovetail connection to the core.
  
[List of Patents for class 310 subclass 216.088]    216.088Split pole:
 This subclass is indented under subclass 216.086.  Subject matter including a dovetailed removable pole, wherein the pole is comprised of plural sections.
  
[List of Patents for class 310 subclass 216.089]    216.089Crimped connection:
 This subclass is indented under subclass 216.079.  Subject matter including a core with a removable pole that includes a portion that is deformably pressed, twisted or pinched together into fixed engagement with a portion of the core.
  
[List of Patents for class 310 subclass 216.091]    216.091Pole tip (e.g., shoe):
 This subclass is indented under subclass 216.074.  Subject matter including a recitation of a structural detail of a pole end or face.

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216.064,for a laminated pole tip, or structural details of the end face of a laminated pole.
  
[List of Patents for class 310 subclass 216.092]    216.092Defining non-uniform air gap:
 This subclass is indented under subclass 216.091.  Subject matter including a pole having an end or face constructed and arranged to define one boundary end of a space (i.e., air gap) between the pole tip and another element defining an opposite air gap boundary face, wherein the distance between all points on the pole end or face and the opposite boundary face of the air gap are not the same distance.

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216.096,for an asymmetrically shaped pole tip.
  
[List of Patents for class 310 subclass 216.093]    216.093Tapered tip:
 This subclass is indented under subclass 216.092.  Subject matter including a pole tip that has a cross-sectional area perpendicular to the direction between the boundary faces of the gap, wherein the cross-sectional area varies with distance away from the air-gap boundary end of the pole.
  
[List of Patents for class 310 subclass 216.094]    216.094Via tip slot:
 This subclass is indented under subclass 216.092.  Subject matter including a pole tip that includes a grooved channel (i.e., slot) that defines the non-uniform air gap.
  
[List of Patents for class 310 subclass 216.095]    216.095With electrical conductor in slot (i.e., winding):
 This subclass is indented under subclass 216.094.  Subject matter including an electrical conductor positioned in the slot in the pole tip.
  
[List of Patents for class 310 subclass 216.096]    216.096Asymmetrically shaped:
 This subclass is indented under subclass 216.091.  Subject matter including a pole tip having a shape that is dissimilar on opposite sides of the center of the pole tip.

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216.092,for a pole tip that defines a non-uniform air gap.
  
[List of Patents for class 310 subclass 216.097]    216.097Having a particular dimension:
 This subclass is indented under subclass 216.091.  Subject matter including a pole tip having a specifically recited spatial extent, e.g., length, width, height, etc.
(1) Note. The dimension may be expressed as a ratio of, for example, length to width, etc., for placement in this subclass.

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216.111,for a core having a particular dimension.
  
[List of Patents for class 310 subclass 216.098]    216.098Removable tip:
 This subclass is indented under subclass 216.091.  Subject matter including a pole tip that is capable of being separated from the remainder of the pole.

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216.079through 216.089, for a removable pole.
  
[List of Patents for class 310 subclass 216.099]    216.099Magnetic inter-pole bridging structure:
 This subclass is indented under subclass 216.091.  Subject matter including a core having a plurality of poles, wherein at least two adjacent poles have ends that have a structural member formed of ferromagnetic material connected between the adjacent pole ends.
(1) Note. The bridging element may itself define a pole tip, or it can be an element separate from, or integral with, distinct pole tips or shoes on adjacent pole ends. The bridging element should be distinguished from magnetic material forming a core body from which the poles extend.

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214,for a coil retainer that bridges poles to hold a coil in a slot between poles.
216.104,for a nonmagnetic element positioned between two adjacent poles for holding a pole tip on a pole body.
  
[List of Patents for class 310 subclass 216.101]    216.101Cylindrical bridging structure:
 This subclass is indented under subclass 216.099.  Subject matter including a core having a plurality of radially-inward extending poles having a bridging element or elements magnetically bridging the poles together at their inner radial ends, wherein the bridging element or elements together form a cylindrically shaped structure.
(1) Note. The cylindrically shaped structure can be a single cylindrical element connected to or integral with the pole ends, or a series of individual arcuate bridging members connected between adjacent poles that collectively form a cylindrically shaped structure in combination with the pole inner ends.

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216.103,for an arcuate shaped magnetic bridging member connecting two adjacent pole inner ends, where the member defines a pole tip common to two pole members.
  
[List of Patents for class 310 subclass 216.102]    216.102Integral with radially extending poles:
 This subclass is indented under subclass 216.101.  Subject matter wherein the cylindrical inter-pole bridging structure and the radially extending poles are constructed together as a unified structural unit.
  
[List of Patents for class 310 subclass 216.103]    216.103Bridge defines distinct pole tip common to two adjacent poles:
 This subclass is indented under subclass 216.099.  Subject matter including a bridging structure that includes a bridge element that bridges only two adjacent poles, and functions as a single pole tip shared by the two adjacent poles.
  
[List of Patents for class 310 subclass 216.104]    216.104With nonmagnetic inter-pole tip support:
 This subclass is indented under subclass 216.091.  Subject matter including a non-ferromagnetic element positioned between two adjacent poles for holding or fixing a pole tip against, or in a positional relationship to, a pole body.

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214,for a coil retainer that bridges poles to hold a coil in a slot between poles.
216.099through 216.0103 for a magnetic element for bridging adjacent poles ends.
216.113,for subject matter to attach a core to a support.
  
[List of Patents for class 310 subclass 216.105]    216.105Insulated:
 This subclass is indented under subclass 216.104.  Subject matter including an inter-pole tip support that is electrically non-conductive or highly resistant to the passage of electric current.
  
[List of Patents for class 310 subclass 216.106]    216.106Having flux guide:
 This subclass is indented under subclass 216.001.  Subject matter wherein the core includes a means for directing the flux within the core in a particular path.
(1) Note. The flux guiding means may include, for example, a slit or slot in the core that creates a localized higher reluctance path within the core.

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216.076,for a pole structure having an integral flux shunt.
216.108,for a flux shield that reduces flux penetration in a particular portion of the core.
  
[List of Patents for class 310 subclass 216.107]    216.107For reluctant rotor core:
 This subclass is indented under subclass 216.106.  Subject matter wherein the core is specifically designed for use in the moving element (i.e., rotor) of a machine of the reluctance type.
  
[List of Patents for class 310 subclass 216.108]    216.108Having flux shield:
 This subclass is indented under subclass 216.001.  Subject matter including a means for reducing penetration of flux into a particular portion of the core.

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216.076,for a pole structure having an integral flux shunt.
216.106,for a flux guide that directs flux in a particular path.
  
[List of Patents for class 310 subclass 216.109]    216.109Spaced-segment core:
 This subclass is indented under subclass 216.001.  Subject matter including a core comprising a plurality of individual core sections, wherein two adjacent core sections are mounted with respect to one another such that an air space is provided between the two adjacent sections.
  
[List of Patents for class 310 subclass 216.111]    216.111Core having a particular dimension:
 This subclass is indented under subclass 216.001.  Subject matter including a core in which a specified measure of spatial extent of at least a portion of the core is recited.
(1) Note. Dimensions may include, for example, various radii at various portions of the core, the depth of a slot, the distance between poles, etc., but are not so limited to these examples.

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12.26,for a linear motor having a magnet or pole structure have a particular shape.
49.16,for a stepping motor with interfitting poles of a particular shape.
216.021,and 216.022, for an E-shaped laminated core.
216.023through 216.039, for a C-or U-shaped laminated core.
216.069through 216.073, for a core having a slot of a particular shape.
216.097,for a pole tip having a particular dimension.
  
[List of Patents for class 310 subclass 216.112]    216.112Specific pole pitch:
 This subclass is indented under subclass 216.111.  Subject matter wherein the particularly recited dimension is pole pitch.

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216.074through 216.105, for pole structure, per se.
  
[List of Patents for class 310 subclass 216.113]    216.113Having a particular binding or supporting means:
 This subclass is indented under subclass 216.001.  Subject matter including a specifically recited means for either securing the core together as an integral body, or securing the core to a support structure.
(1) Note. Subject matter including significant core structure adapted for supporting the core via the core structure itself, a detailed structural relationship between a separate fixing means and the core, or a particular structure of the fixing means, per se, are classified in this and indented subclasses; whereas a core support (e.g., frame) having a means for supporting a nominal core is classified elsewhere. See Search Notes, below.

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216.004through 216.014 , for laminated core structure, particularly subclass 216. 044, for a projection /recess for securing laminations in an axially spirally wound core; subclass 216.048, for a radially laminated core with mating interfitting structure on the face of a lamination; subclasses 216.049-216.052, for a laminated core having a lamination with a mounting ear.
216.058,for a laminated pole having means for securing the laminations into a unitary body.
216.079,for a means for supporting a removable pole to a core.
216.104,for a nonmagnetic pole tip support positioned between adjacent poles.
422,for a frame having a means for securing a core to the frame.

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336Inductor Devices,   subclasses 65 through 68for mounting or support structure for an inductor.
  
[List of Patents for class 310 subclass 216.114]    216.114End ring or plate:
 This subclass is indented under subclass 216.113.  Subject matter wherein the securing means comprises a band generally mounted along the periphery of an axial end face of a core, or a generally flat or planar member attached to an axial end face of a core, for securing core elements together as an integral body.
(1) Note. A ring or plate for this subclass is for the purpose of securing, for example, by bridging across core laminations or core sections to bind them together as a unit, as opposed to a mere enclosure, support or stator end shield, classified elsewhere.

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216.135,for a core secured by a circumferential clip.
400through 417, for an end shield.
  
[List of Patents for class 310 subclass 216.115]    216.115Insulated:
 This subclass is indented under subclass 216.114.  Subject matter including an end ring or end plate comprised of a material that is highly resistant or non-conductive to electrical current.
(1) Note. The insulation is commonly used to provide electrical insulation between the core and a coil or winding supported on the coil. The ring or plate may be comprised of insulating material, or include a layer of insulating material placed on the surface of the ring or plate.
  
[List of Patents for class 310 subclass 216.116]    216.116Secured to shaft:
 This subclass is indented under subclass 216.114.  Subject matter wherein the end ring or end plate is fixedly attached to an elongated element (i.e., shaft) having an axis about which the core and elongated element rotate.

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216.119,for a core secured to a shaft by means other than an end ring or end plate.
420through 424, for a frame secured to a shaft via a spider.
  
[List of Patents for class 310 subclass 216.117]    216.117With balancing weight:
 This subclass is indented under subclass 216.116.  Subject matter including an element having a particular mass positioned on the end ring or end plate and shaft combination such that the center of mass of the combination is located on the axis of the shaft.
  
[List of Patents for class 310 subclass 216.118]    216.118Secured to frame:
 This subclass is indented under subclass 216.114.  Subject matter wherein the end ring or end plate is fixedly attached to the machines frame or enclosure.

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418through 433, for frame structure having means for supporting a core.
  
[List of Patents for class 310 subclass 216.119]    216.119Having a cooling channel:
 This subclass is indented under subclass 216.114.  Subject matter including an end ring or end plate having a ventilation passage therein to permit heat to be dissipated from the core.

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16,for cooling of a reciprocating motor or generator.
12.29,for cooling of a linear dynamoelectric machine.
52through 65, for cooling of a rotary dynamoelectric machine, especially subclass 60, for circulation via hollow passages.
216.014,for a cooling fin on a core having cumferentially offset laminations in a rotary dynamoelectric machine.
216.056,for a cooling fin on a laminated core of a rotary dynamoelectric machine.
227,for current collector cooling in a rotary dynamoelectric machine.
417,for a rotary dynamoelectric machine end shield having ventilation holes.
  
[List of Patents for class 310 subclass 216.121]    216.121Secured to shaft:
 This subclass is indented under subclass 216.113.  Subject matter wherein the support structure from which the core is supported is an elongated element (i.e., shaft) having an axis about which the core and elongated element rotate.

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216.053,for a laminated core having a lamination with an integral spider to support the core on a shaft.
216.116,for a core secured to a shaft via an end ring or end plate.
216.129,for a core is secured by an axially extending bar to hold the core together.
  
[List of Patents for class 310 subclass 216.122]    216.122Two axial end shafts:
 This subclass is indented under subclass 216.121.  Subject matter wherein the shaft comprises two shafts, wherein each shaft is fixed to respective opposite axial ends of the core, without passing through the core.
  
[List of Patents for class 310 subclass 216.123]    216.123Keyed to shaft:
 This subclass is indented under subclass 216.121.  Subject matter including a core secured to a shaft that further includes an element (i.e., key) for locking the core and shaft together to prevent relative movement between the core and shaft.
(1) Note. The key can be an element separate and distinct from the core and shaft, or an integral extension of one of the core and shaft.
  
[List of Patents for class 310 subclass 216.124]    216.124Resilient securing means:
 This subclass is indented under subclass 216.113.  Subject matter wherein the means to secure the core to a support includes a material or structure that is capable of withstanding shock without permanent deformation or rupture (e.g., by a spring or elastic material, etc.).

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423,for a frame supported from a shaft-mounted spider with a resilient core supporting means.
431,for a frame having a resilient core supporting means.
  
[List of Patents for class 310 subclass 216.125]    216.125Secured by wedge:
 This subclass is indented under subclass 216.113.  Subject matter wherein the means for fixing the core to a support includes a tapered element press fit in a narrow space between the core and the support.
  
[List of Patents for class 310 subclass 216.126]    216.126Fastened wedge:
 This subclass is indented under subclass 216.125.  Subject matter including a wedge having means to fixedly attach the wedge in its wedging position to prevent it from slipping out of the wedging position.
  
[List of Patents for class 310 subclass 216.127]    216.127Secured by threaded fastener (e.g., screw):
 This subclass is indented under subclass 216.113.  Subject matter wherein the means for fixing the core to a support includes an elongated element having an exterior helical projection (i.e., screw thread), wherein the elongated element passes through a bore in either one of the support or the core, and is engagable with mating threads on the other one of the support or core for holding the support and core in a fixed relationship.

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216.083,for a pole removably secured to a core by a threaded fastener.
  
[List of Patents for class 310 subclass 216.128]    216.128Insulated fastener:
 This subclass is indented under subclass 216.127.  Subject matter wherein the threaded fastener is constructed of an electrically resistive or non-conductive material.
  
[List of Patents for class 310 subclass 216.129]    216.129Secured by axially extending bar:
 This subclass is indented under subclass 216.113.  Subject matter including a core fixing means comprising a rigid elongated element that extends generally parallel to the axis of rotation of a machine in which the core is associated, and is attached to the core at one or more points to secure the core.
(1) Note. The axially extending bar may also serve as a means to secure the core to a supporting element.

SEE OR SEARCH THIS CLASS, SUBCLASS:

216.116,for a core supported on a shaft via an end ring or end plate.
216.121,for a core supported on a shaft.
432,and 433, for a frame having an axial tie bar for supporting a core.
  
[List of Patents for class 310 subclass 216.131]    216.131Secured by axially directed clamping means (e.g., spring clip):
 This subclass is indented under subclass 216.113.  Subject matter including means for providing axially directed pressure at both axial ends of a core to bind elements or laminations of a core together into a unitary body.
(1) Note. The means for clamping commonly consists of a clip that spans the length of the core, with, for example, spring tensioned arms at the axial ends of the clip to provide axially directed pressure to squeeze core laminations together into a binding relationship.
(2) Note. The means for clamping the core into a unitary body may also serve to secure the core to a supporting element.
  
[List of Patents for class 310 subclass 216.132]    216.132Positioned in core slot:
 This subclass is indented under subclass 216.131.  Subject matter wherein the core includes an axially extending depression or slot in its surface, and the clamping means is positioned in the depression or slot.
  
[List of Patents for class 310 subclass 216.133]    216.133Positioned in axial through hole:
 This subclass is indented under subclass 216.131.  Subject matter wherein the core includes an axially extending bore from one axial end of the core to the other and the clamping means is located in the bore.
  
[List of Patents for class 310 subclass 216.134]    216.134Integral with supporting element:
 This subclass is indented under subclass 216.131.  Subject matter wherein the clamping means comprises an element structurally united with a supporting means for the core.
  
[List of Patents for class 310 subclass 216.135]    216.135Secured by circumferential clip:
 This subclass is indented under subclass 216.113.  Subject matter including core securing means comprising an element that extends at least partially around the outer periphery of the core and grips the core.
  
[List of Patents for class 310 subclass 216.136]    216.136Secured by weld:
 This subclass is indented under subclass 216.113.  Subject matter wherein the particular means for fixing the core to a support structure or fixing the core as an integral body includes a fusion bond created by heating.
  
[List of Patents for class 310 subclass 216.137]    216.137Secured by bonding agent:
 This subclass is indented under subclass 216.113.  Subject matter wherein the particular means for fixing the core to a support structure or fixing the core as an integral body includes an attachment established via an adhesive material.

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216.065,for a bonding agent uses to secure laminations of a laminated core together.
  
[List of Patents for class 310 subclass 219]    219
 This subclass is indented under subclass 40.  Subject matter relating to current collectors.

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191Electricity: Transmission to Vehicles,   subclasses 45+ for similar subject matter where current is collected from an extended conductor by a traveling brush.
318Electricity: Motive Power Systems,   subclasses 541+ for electric motor systems having current collector control means, such as brush shifting means.
322Electricity: Single Generator Systems,   subclass 53 and 54+ for single generator systems having brush control means for shifting the generator brush.
388Electricity: Motor Control Systems,   subclass 836 for running-speed control systems in which the position or number of brushes may be varied.
439Electrical Connectors,   subclasses 1+ for a pair of relatively movable electrical connectors.
  
[List of Patents for class 310 subclass 220]    220
 This subclass is indented under subclass 219.  Subject matter relating to the reduction of sparking at the current collector.

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318Electricity: Motive Power Systems,   subclasses 400.1 through 400.42for electric motor systems having means to control the commutation.
  
[List of Patents for class 310 subclass 221]    221
 This subclass is indented under subclass 220.  Subject matter having arc extinguishing means.
(1) Note. This subclass relates, for example, to dynamoelectric devices having means to extinguish arcs that result when the commutator flashes over.

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361Electricity: Electrical Systems and Devices,   subclasses 1+ for safety and protection of systems and devices, indented subclasses 2+ for arc control, subclasses 20+ for generator protective circuits, and subclasses 23+ for motor protective circuits.
  
[List of Patents for class 310 subclass 222]    222
 This subclass is indented under subclass 220.  Subject matter for providing a spark neutralizing current.
  
[List of Patents for class 310 subclass 223]    223
 This subclass is indented under subclass 220.  Subject matter having flux compensating means.
  
[List of Patents for class 310 subclass 224]    224
 This subclass is indented under subclass 223.  Subject matter in which the flux compensating means is a compensating pole or winding.
  
[List of Patents for class 310 subclass 225]    225
 This subclass is indented under subclass 223.  Subject matter in which the flux compensating means is a short circuited coil circuit.
  
[List of Patents for class 310 subclass 226]    226
 This subclass is indented under subclass 223.  Subject matter in which the flux compensating means is a means to introduce a distortion of the magnetic field.
  
[List of Patents for class 310 subclass 227]    227
 This subclass is indented under subclass 219.  Subject matter having cooling means.

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16,for cooling of a reciprocating motor or generator.
12.29,for cooling of a linear dynamoelectric machine.
52through 65, for cooling of a rotary dynamoelectric machine.
216.014,for a cooling fin on a core having cumferentially offset laminations in a rotary dynamoelectric machine.
216.056,for a cooling fin on a laminated core of a rotary dynamoelectric machine.
216.119,for a cooling channel in the end ring of a core of a rotary dynamoelectric machine.
417,for a rotary dynamoelectric machine end shield having ventilation holes.
  
[List of Patents for class 310 subclass 228]    228
 This subclass is indented under subclass 219.  Subject matter having cleaning, lubricating, resurfacing or repairing means as part thereof.

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29Metal Working,   subclass 597 for miscellaneous methods of manufacturing and repairing commutators.
  
[List of Patents for class 310 subclass 229]    229
 This subclass is indented under subclass 219.  Subject matter having means to cause a brush to traverse along a path which is parallel to the axis of rotation of the dynamoelectric device.
(1) Note. The brush traverse may, for example, be an adjustment to regulate the position of the brush or it may be, for example, a means to cause the brush to traverse back and forth continuously so as to distribute wear.

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318Electricity: Motive Power Systems,   subclasses 541+ for this subject matter in an electric motor system.
  
[List of Patents for class 310 subclass 230]    230
 This subclass is indented under subclass 219.  Subject matter having means for circumferentially shifting the position of the brush in order to effect reversal of the direction of rotation.

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318Electricity: Motive Power Systems,   subclass 292 for this subject matter in an electric motor system.
322Electricity: Single Generator Systems,   subclass 53 and 54+ for this subject matter in a single generator system.
323Electricity: Power Supply or Regulation Systems,   subclass 203 for this subject matter in a voltage magnitude control system.
  
[List of Patents for class 310 subclass 231]    231
 This subclass is indented under subclass 219.  Subject matter relating to rotary structure.

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428Stock Material or Miscellaneous Articles,   subclass 569 for stock materials or intermediate articles which comprise continuous interengaged phases of plural metals, at least one of which contains molybdenum or tungsten.
  
[List of Patents for class 310 subclass 232]    232
 This subclass is indented under subclass 231.  Subject matter relating to slip rings.
  
[List of Patents for class 310 subclass 233]    233
 This subclass is indented under subclass 231.  Subject matter relating to commutators.

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29Metal Working,   subclass 507 for miscellaneous methods of manufacturing commutators.
174Electricity: Conductors and Insulators,   subclass 138 for commutator segment insulators, per se.
361Electricity: Electrical Systems and Devices,   subclasses 245+ for polarity reversing systems some of which have commutated type reversing switches.
  
[List of Patents for class 310 subclass 234]    234
 This subclass is indented under subclass 233.  Subject matter relating to winding connectors for connecting the winding to the commutator segments.
  
[List of Patents for class 310 subclass 235]    235
 This subclass is indented under subclass 233.  Subject matter relating to molded supports for supporting the commutator segments.
  
[List of Patents for class 310 subclass 236]    236
 This subclass is indented under subclass 233.  Subject matter relating to cylindrical or drum type commutators.
  
[List of Patents for class 310 subclass 237]    237
 This subclass is indented under subclass 233.  Subject matter relating to disk type commutators.

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370Multiplex Communications,   subclasses 303+ for a multiplexing system having a rotary distributor.
  
[List of Patents for class 310 subclass 238]    238
 This subclass is indented under subclass 219.  Subject matter relating to fixed collector structure.

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314Electric Lamp and Discharge Devices: Consumable Electrodes,   subclasses 130+ for electrode holders for arc lamps and similar devices.
  
[List of Patents for class 310 subclass 239]    239
 This subclass is indented under subclass 238.  Subject matter relating to brush holders or rigging.
  
[List of Patents for class 310 subclass 240]    240
 This subclass is indented under subclass 239.  Subject matter relating to means for lifting the brushes.

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318Electricity: Motive Power Systems,   subclass 728 for induction motor systems in which the induction motor starts as a repulsion motor.
322Electricity: Single Generator Systems,   subclasses 54+ for this subject matter in a single generator system.
  
[List of Patents for class 310 subclass 241]    241
 This subclass is indented under subclass 239.  Subject matter having means for circumferentially adjusting the position of the brushes.
  
[List of Patents for class 310 subclass 242]    242
 This subclass is indented under subclass 239.  Subject matter relating to means for holding or guiding the brushes.
  
[List of Patents for class 310 subclass 243]    243
 This subclass is indented under subclass 239.  Subject matter having means for operating the brush rigging or holders by means of fluid pressure.
(1) Note. This subclass relates, for example, to brush rigging in which the pressure of the brush against the commutator is determined by fluid pressure.
  
[List of Patents for class 310 subclass 244]    244
 This subclass is indented under subclass 239.  Subject matter in which the brush is affixed to a pivoted arm.
  
[List of Patents for class 310 subclass 245]    245
 This subclass is indented under subclass 239.  Subject matter in which the brush is slidably positioned in its holder.
  
[List of Patents for class 310 subclass 246]    246
 This subclass is indented under subclass 245.  Subject matter having an arm which presses against the brush to exert pressure between the brush and the commutator or slip ring.
  
[List of Patents for class 310 subclass 247]    247
 This subclass is indented under subclass 245.  Subject matter having an axial spring to press upon the brush so as to exert pressure between the brush and the commutator or slip ring.
  
[List of Patents for class 310 subclass 248]    248
 This subclass is indented under subclass 238.  Subject matter relating to brushes, per se.

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373Industrial Electric Heating Furnaces,   appropriate subclasses for electric arc furnaces some of which utilize electrodes which are analogous to the brushes of this and indented subclasses.
313Electric Lamp and Discharge Devices,   subclasses 326+ (note particularly indented subclass 357) for electrodes for electric lamp and discharge devices, some of which are analogous to the brushes of this and the indented subclasses.
314Electric Lamp and Discharge Devices: Consumable Electrodes,   subclass 60 for arc lamp electrodes, some of which are analogous to this and indented subclasses.
  
[List of Patents for class 310 subclass 249]    249
 This subclass is indented under subclass 248.  Subject matter having an electrical connector.
(1) Note. The electrical connector, for example, may be a copper pigtail which is integral with a carbon brush.

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439Electrical Connectors,   appropriate subclasses for an electrical connector, generally.
  
[List of Patents for class 310 subclass 251]    251
 This subclass is indented under subclass 250.  Subject matter in which the structure is made of composite materials.

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428Stock Material or Miscellaneous Articles,   subclasses 615+ for composite stock materials, such as, for example, plural metallic layers with interleaved nonmetallic layers.
  
[List of Patents for class 310 subclass 252]    252
 This subclass is indented under subclass 248.  Subject matter relating to the composition of the brush.
(1) Note. The search should, in all instances, continue in the class which relates to the composition, per se.

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106Compositions: Coating or Plastic,   appropriate subclasses for coating or plastic compositions in general.
252Compositions,   subclasses 500+ for electrically conductive compositions and for brushes defined solely in terms of the composition of which they are composed.
  
[List of Patents for class 310 subclass 253]    253
 This subclass is indented under subclass 252.  Subject matter relating to carbonaceous compositions.
  
[List of Patents for class 310 subclass 254.1]    254.1Miscellaneous stator structure:
 This subclass is indented under subclass 40.  Subject matter related to stator structure, per se, not otherwise provided for.
(1) Note. This is the residual locus for miscellaneous stator structure for an electrical generator or motor that is not provided for elsewhere. Mere intended use as a stator is insufficient for original placement in this subclass if particular recited structure is provided for in earlier subclasses. Similarly, discretion should be exercised in placement in this subclass as a cross reference merely due to disclosed use as a stator.

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336Inductor Devices,   subclasses 210 through 213,216-219, 233, and 234 for various features of magnetic core structure of inductive devices, of which subclass 233 is the general subclass for inductor device cores not elsewhere classified.
  
[List of Patents for class 310 subclass 255]    255
 This subclass is indented under subclass 254.1.  Subject matter relating to railway type machines.

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105Railway Rolling Stock,   subclasses 49+ for electric locomotives.
  
[List of Patents for class 310 subclass 256]    256
 This subclass is indented under subclass 254.1.  Subject matter relating to the prevention of flux loss due to stray fields.

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336Inductor Devices,   subclasses 84+ for inductor devices with electric and magnetic shielding means.
  
[List of Patents for class 310 subclass 257]    257
 This subclass is indented under subclass 254.1.  Subject matter relating to interfitting or claw tooth stators.

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263,for interfitting or claw tooth rotors.
  
[List of Patents for class 310 subclass 260]    260
 This subclass is indented under subclass 254.1.  Subject matter relating to end turn supports.

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270,for end turn supports for rotors.

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336Inductor Devices,   subclass 197 for inductor devices having coil clamps or wedges to secure or space coil and core.
  
[List of Patents for class 310 subclass 261.1]    261.1Miscellaneous rotor structure:
 This subclass is indented under subclass 40.  Subject matter relating to rotor structure, per se, not otherwise provided for.
(1) Note. This is the residual locus for miscellaneous rotor structure for an electrical generator or motor that is not provided for elsewhere. Mere intended use as a rotor is insufficient for original placement in this subclass if particular recited structure is provided for in earlier subclasses. Similarly, discretion should be exercised in placement in this subclass as a cross reference merely due to disclosed use as a rotor.

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336Inductor Devices,   subclasses 210 through 213,216-219, 233, and 234 for various features of magnetic core structure of inductive devices, of which subclass 233 in the general subclass for inductor device cores not elsewhere classified.
  
[List of Patents for class 310 subclass 262]    262
 This subclass is indented under subclass 261.1.  Subject matter relating to high speed rotors.

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168+,especially 169+, for induction type generators utilizing high speed rotors.
  
[List of Patents for class 310 subclass 263]    263
 This subclass is indented under subclass 261.1.  Subject matter relating to interfitting or claw tooth rotors.

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257,for interfitting or claw tooth stators.
  
[List of Patents for class 310 subclass 264]    264
 This subclass is indented under subclass 261.1.  Subject matter relating to armatures, per se.
  
[List of Patents for class 310 subclass 265]    265
 This subclass is indented under subclass 264.  Subject matter relating to drum type armatures.
  
[List of Patents for class 310 subclass 266]    266
 This subclass is indented under subclass 264.  Subject matter relating to hollow armatures.
(1) Note. This subclass relates, for example, to armatures having a double air gap.
  
[List of Patents for class 310 subclass 267]    267
 This subclass is indented under subclass 264.  Subject matter relating to ring type armatures.
  
[List of Patents for class 310 subclass 268]    268
 This subclass is indented under subclass 264.  Subject matter relating to disc type armatures.
  
[List of Patents for class 310 subclass 269]    269
 This subclass is indented under subclass 264.  Subject matter relating to salient pole armatures.
  
[List of Patents for class 310 subclass 270]    270
 This subclass is indented under subclass 261.1.  Subject matter relating to end turn supports.

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260,for end turn supports for stator windings.

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336Inductor Devices,   subclass 197 for inductor devices having coil clamps or wedges to secure or space core and coil.
  
[List of Patents for class 310 subclass 271]    271
 This subclass is indented under subclass 261.1.  Subject matter relating to banding.

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262,for high speed type rotors.
  
[List of Patents for class 310 subclass 272]    272
 This subclass is indented under subclass 40.  Subject matter relating to elements.

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74Machine Element or Mechanism,   subclasses 567 through 617for mechanical elements, per se.
  
[List of Patents for class 310 subclass 273]    273
 This subclass is indented under subclass 40.  Subject matter relating to miscellaneous features not set forth in the indented subclasses under subclass 40.
  
[List of Patents for class 310 subclass 300]    300NONDYNAMOELECTRIC:
 This subclass is indented under the class definition.  Subject matter which is not related to the conversion of energy between the electrical and mechanical state by electromagnetic action.
(1) Note. Consult the classes referred to in the search notes to the class definition of this class for other classes having similar subject matter.

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10+,for subject matter under the class definition related to the conversion of energy between the electrical and the mechanical state by means of electromagnetic action.

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318Electricity: Motive Power Systems,   subclasses 116+ for the subject matter of this subclass in combination with an electrical system.
322Electricity: Single Generator Systems,   subclass 2 for subject matter of this subclass in an electric generator system.
  
[List of Patents for class 310 subclass 301]    301Nuclear reaction:
 This subclass is indented under subclass 300.  Subject matter relating to the obtaining of energy in the electrical state from the internal energy of the atom.
(1) Note. This subclass relates, for example, to electric generators consisting of radioactive sources which acquire a charge due to the emission of electrons or other ionized particles at such a high speed as to go through a considerable adverse electric gradient before being collected.

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331Oscillators,   subclass 94 for electrical oscillators of the molecular or particle resonant type (e.g., Maser).
376Induced Nuclear Reactions: Processes, Systems, and Elements,   subclasses 100+ for fusion reactors; and subclasses 347+ for fission reactors.
  
[List of Patents for class 310 subclass 302]    302Contact potential difference:
 This subclass is indented under subclass 301.  Subject matter comprising at least a pair of metal electrodes having dissimilar work functions and a material (e.g., gas) ionized by a radioactive source, the electrodes and the material so arranged relative to each other that the ions of the material, under the influence of the field established between the electrodes are collected by the electrodes to provide a source of current for an external load.
  
[List of Patents for class 310 subclass 303]    303P-N semiconductor:
 This subclass is indented under subclass 301.  Subject matter comprising two intimately united semiconductor materials, one of the N type and one of the P type, and a radioactive source which irradiates the semiconductor materials to liberate charge carriers (electrons and holes) therein which flow under the influence of the field across the junction of the semiconductor materials to be collected on opposite sides of the junction and thus, provide a source of current for an external load.
  
[List of Patents for class 310 subclass 304]    304Secondary electron emission:
 This subclass is indented under subclass 301.