Class Definition for Class 361 - ELECTRICITY: ELECTRICAL SYSTEMS AND DEVICES

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CLASS 361,	ELECTRICITY: ELECTRICAL SYSTEMS AND DEVICES
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SECTION I - CLASS DEFINITION

STATEMENT OF GENERAL SUBJECT MATTER OF CLASS

This is the residual class for:

A. Systems or devices which provide safety and protection for other systems and devices.

B. Control circuits for electromagnetic devices.

C. Control circuits for nonelectromagnetic-type relays.

D. Systems or devices which discharge, or prevent the accumulation of electrical charge on or in an object or material.

E. Circuits for charging objects or materials.

F. Systems for generating or conducting an electric charge.

G. Systems which process electrical speed signals.

H. Circuits for reversing the polarity of an electric circuit.

I. Systems which cause the ignition of a fuel or an explosive charge.

J. Systems and processes for demagnetizing a magnetic field.

K. Transformers and inductors with integral switch, capacitor or lock.

L. Electrostatic capacitors, per se.

M. Housings and mounting assemblies with plural diverse electrical components.

N. Electrolytic systems and devices.

O. Miscellaneous electrical systems and devices, which are not generic to any other class and are not provided for in any other subclass of this class.

SECTION II - LINES WITH OTHER CLASSES AND WITHIN THIS CLASS

Many other electrical and mechanical classes provide for systems or machines which include the electrical systems and devices provided for in this class (361). The combination of the subject matter of this class (361) and an art environment is generally classified with the art environment where that environment is significant, either by virtue of a significant disclosed relationship or by virtue of a claimed relationship. Where the art environment is recited by name only (e.g., motor protective circuit), the combination may be classified, in some instances, with the art environment, and in others, in this class (361).

Whereas housings for electronic devices and components are also provided for elsewhere, Class 361 provides for housings and mounting assemblies having more than one different type of electrical component, the electrical components normally do not recite significant art limitations. (See Subclass References to the Current Class and References to Other Classes, below.)

Housings wherein (1) the housing is for an active solid state device, details of which are positively recited in the claims, or (2) where the recited housing is necessary to make a usable active solid state device whether or not the active solid state device is recited nominally or in detail are provided for elsewhere. (See References to Other Classes, below.)

However, if a housing with nominally recited active solid state devices recites different types of (active or passive) devices, then original (OR) classification is in Class 361.

Claims that recite housings with only nominal recitation of active solid state devices of only one type should be classified as originals (ORs) in neither Class 257 or Class 361, but rather in Class 174.

SECTION III - SUBCLASS REFERENCES TO THE CURRENT CLASS

SEE OR SEARCH THIS CLASS, SUBCLASS:

331+,	for housings and mounting assemblies having more than one different type of electrical component; the electrical components normally do not recite significant art limitations. These subclasses also provide for combinations of housings and mounting assembles with different types of art wherein the combination is not provided for where the different art is classified.
335+,	for housings and switch gear.
364+,	for housings and meter structure.
381+,	for housings with cooling means.

SECTION IV - REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:

29,	Metal Working, appropriate subclasses for miscellaneous methods of manufacturing or mounting electrical or magnetic devices.
36,	Boots, Shoes, and Leggings, for necessary shoe structure.
43,	Fishing, Trapping, and Vermin Destroying, subclasses 98+ for electrocuting-type animal traps, and subclasses 112 for devices for electrocuting insects.
47,	Plant Husbandry, subclass 1.3 for the growing of plants as affected by electricity, as, for example, to stimulate the growth or to kill the plants.
70,	Locks, for locking means, per se. Note, especially subclasses 174+ for locking means for control and machine elements; subclasses 237+ for locking means for automobile vehicles.
73,	Measuring and Testing, subclasses 304+ for capacitive liquid level gauges; subclasses 718 and 724 for capacitive fluid pressure gauge; subclasses 488+ for speed or accelerating measuring.
74,	Machine Element or Mechanism, subclasses 10+ for the combination of a capacitor and a dial shaft operator; subclasses 395+ for systems for synchronizing the rotary motion of a plurality of shafts where adjustable gearing is utilized to control the rotation of at least one of the shafts.
84,	Music, subclasses 723+ for electrical musical instruments, such as electric organs and conventional musical instruments with electrical pick-up, amplifying and reproducing means.
89,	Ordnance, appropriate subclasses for explosive device projecting or dropping means having igniting means as a part thereof.
91,	Motors: Expansible Chamber Type, appropriate subclasses and especially subclass 171 for synchronizing plural expansible chamber motors.
96,	Gas Separation: Apparatus, subclasses 15+ for electrostatic-type precipitators.
102,	Ammunition and Explosives, appropriate subclasses for explosive devices having igniting means as a portion thereof.
106,	Compositions: Coating or Plastic, subclasses 1.05+ for metalizing compositions, per se.
114,	Ships, subclass 240 for degaussing of ships.
116,	Signals and Indicators, subclass 38 for vehicular governors indicating speed and direction; subclasses 241+ and 284+ for miscellaneous indicators for indicating the position of a variable capacitor.
118,	Coating Apparatus, subclasses 621+ for electrostatic spray devices.
119,	Animal Husbandry, subclass 145 for electrified station shields.
123,	Internal-Combustion Engines, subclasses 143+ for igniting systems utilized with internal combustion engines; subclasses 319+ for speed regulators.
126,	Stoves and Furnaces, appropriate subclasses for solid fuel burners having igniting means.
136,	Batteries: Thermoelectric and Photoelectric, for electrochemical and electrothermal sources of electricity.
165,	Heat Exchange, appropriate subclasses for a heat exchange structure of a general nature.
174,	Electricity: Conductors and Insulators, for electric conductor and insulator structure, including conduits, boxes and housings.
177,	Weighing Scales, subclasses 210+ for capacitor gauges.
178,	Telegraphy, for the reproduction of pictures by a scanning procedure, as in television, facsimile and photomechanical engraving and for telegraphy, as in telautograph and teletypewriting.
180,	Motor Vehicles, appropriate subclasses and see Class 361, subclass 51 , search notes.
200,	Electricity: Circuit Makers and Breakers, for switches and circuit breakers.
204,	Chemistry: Electrical and Wave Energy, for the producing of chemical change by means of electricity, as in electrosputtering.
205,	Electrolysis: Processes, Compositions Used Therein, and Methods of Preparing the Compositions, for the producing of chemical change by means of electricity, as in electrolytic coating.
209,	Classifying, Separating, and Assorting Solids, for electrical classifying, separating and assorting of materials and objects.
211,	Supports: Racks, subclasses 41.1+ for frame structure designed to support plates or plate-like articles.
219,	Electric Heating, for miscellaneous electrical heating, including welding. Note, subclass 384 for perforating sheet material by means of an electric spark.
221,	Article Dispensing, subclasses 143+ for article dispensers having electrical igniting means.
222,	Dispensing, for dispensing devices utilizing electromagnetic actuators.
231,	Whips and Whip Apparatus, subclass 7 for a device consisting of a handle and an electrified goad for causing an electric shock to be produced in an animal to control the movement or behavior of the animal.
235,	Registers, subclasses 61+ for calculators having relay-type counting chains.
236,	Automatic Temperature and Humidity Regulation, appropriate subclasses for automatic temperature control systems; appropriate subclasses for complete heating systems having igniters as a portion thereof.
239,	Fluid Sprinkling, Spraying, and Diffusing, subclasses 2.1 , 3, and 690+ respectively, for methods and apparatus for projecting a liquid into the air and including a provision for imparting an electrostatic charge to the projected liquid. See the notes to these subclasses for a statement of the line.
244,	Aeronautics and Astronautics, subclass 1 for aircraft lightning arresters and static eliminators.
246,	Railway Switches and Signals, appropriate subclasses for electrical control of railway switches and signals.
250,	Radiant Energy, for radio and microwave absorption meters, the detection of the nuclear or electromagnetic energy, the testing of materials by nuclear or electromagnetic energy, mass spectroscopy, fluorescent and phosphorescent applications, electron or ion beam deflection or focusing ion generation, supports for fluent material or objects, the irradiation of material or objects, nuclear and electromagnetic radiation detectors, radiant energy generators and sources, radiation controlling means, and radiation source and detector supports.
252,	Compositions, subclasses 512+ for electrically conductive metal-containing compositions; subclass 567 for a web or sheet impregnated with a defined dielectric liquid; and subclasses 570+ for a fluent dielectric, per se.
256,	Fences, subclass 10 for electric fences.
257,	Active Solid-State Devices (e.g., Transistors, Solid-State Diodes), appropriate subclasses for active solid-state semiconductor devices, per se. Class 257 provides for housings wherein (1) the housing is for an active solid state device, details of which are positively recited in the claims, or (2) where the recited housing is necessary to make a usable active solid state device whether or not the active solid state device is recited nominally or in detail. (Lines With Other Classes and Within This Class, above.)
290,	Prime-Mover Dynamo Plants, for electric generating plants.
303,	Fluid-Pressure and Analogous Brake System, subclasses 113.1+ for antiskid systems where brakes are operated.
307,	Electrical Transmission or Interconnection Systems, for systems of distributing electricity or interconnection. The line between Class 307 and this class (361) can be determined only by consulting the art to be found in these two classes.
310,	Electrical Generator or Motor Structure, subclass 90.5 for magnetic supports.
312,	Supports: Cabinet Structure, subclasses 294+ for supports and cabinets with movable components.
313,	Electric Lamp and Discharge Devices, for electric lamps, vacuum tubes, gas discharge tubes and spark gaps.
314,	Electric Lamp and Discharge Devices: Consumable Electrodes, for arc lamps.
315,	Electric Lamp and Discharge Devices: Systems, for cathode-ray tube circuits, gas tube circuits, electric lamp circuits, and circuits which are integral with a discharge device or lamp.
318,	Electricity: Motive Power Systems, for electric motor systems, including servo-motor systems.
320,	Electricity: Battery or Capacitor Charging or Discharging, for a method or apparatus for charging or discharging a battery or capacitor.
322,	Electricity: Single Generator Systems, for systems for controlling a single generator and its prime mover.
323,	Electricity: Power Supply or Regulation Systems, for systems for controlling the voltage of electricity and the phase of alternating currents.
324,	Electricity: Measuring and Testing, for electrical measuring, testing and sensing, such as, for example, the determination of moisture in material by measuring its resistivity and the measuring of power in an electric circuit.
327,	Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems, appropriate subclasses for miscellaneous active device circuits.
329,	Demodulators, subclasses 311+ for pulse demodulators which may include radiation reduction.
330,	Amplifiers, appropriate subclasses for amplifier systems.
331,	Oscillators, appropriate subclasses for self-sustaining electric wave generators of the nondynamoelectric type.
332,	Modulators, for systems for modulating an intelligence upon a repetitious wave.
333,	Wave Transmission Lines and Networks, appropriate subclasses for the subject matter of that class.
334,	Tuners, appropriate subclasses for tuned networks used in wave energy apparatus, tuners with shielding means, and switch operated tuners.
335,	Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, for electromagnets with armatures, switches or magnetic chuck structure.
336,	Inductor Devices, for transformers and inductances.
337,	Electricity: Electrothermally or Thermally Actuated Switches, appropriate subclasses for thermal-type circuit breakers, per se.
338,	Electrical Resistors, appropriate subclasses for electrical resistors both of the linear and nonlinear types.
340,	Communications: Electrical, appropriate subclasses for miscellaneous electrical signalling.
343,	Communications: Radio Wave, for radar and directive radio systems and antennas.
352,	Optics: Motion Pictures, for motion picture apparatus combined with sound recording or reproducing apparatus, including means for synchronizing the two.
362,	Illumination, for electric lights and photographic illumination devices including ignition means.
363,	Electric Power Conversion Systems, in which electricity is converted from one form to another as from direct current to alternating.
368,	Horology: Time Measuring Systems or Devices, subclass 293 for antimagnetic devices used in horology.
369,	Dynamic Information Storage or Retrieval, subclasses 72+ for storage medium electrostatic charge neutralization; and subclass 126 for information storage by dynamic electrostatic charge.
375,	Pulse or Digital Communications, for pulse communication equipment.
376,	Induced Nuclear Reactions: Processes, Systems, and Elements, subclasses 100+ for processes and devices for electrically and/or magnetically confining and controlling a plasma to yield nuclear fusion reactions.
378,	X-Ray or Gamma Ray Systems or Devices, for X-ray or gamma ray systems or devices.
379,	Telephonic Communications, for telephone systems and subcombinations.
396,	Photography, subclasses 155+ for photoflash devices combined with camera structure which may include ignition means.
399,	Electrophotography, subclass 37 for diagnostics of power supplied to an electrophotographic device, subclasses 88+ for machine operations with power supply, and subclasses 168+ for charging a photoconductive member.
416,	Fluid Reaction Surfaces (i.e., Impellers), appropriate subclasses for centrifugal or impeller rotation speed responsive systems.
420,	Alloys or Metallic Compositions, for alloys, per se.
422,	Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, subclasses 21 , 22+, and 186 for process and apparatus provided by the class using electrical energy.
427,	Coating Processes, subclasses 458+ for processes of coating, per se, utilizing an electrostatic charge; subclasses 79+ for processes of coating utilized in making capacitors.
431,	Combustion, subclass 128 for hand manipulatable electric igniters for igniting fuel.
439,	Electrical Connectors, for electrical connectors.
454,	Ventilation, appropriate subclasses for ventilating devices.
455,	Telecommunications, for receivers, transmitters and miscellaneous apparatus.
463,	Amusement Devices: Games, subclass 47.3 for a striking type of weapon for use on a human being which includes an electric shock feature (e.g., an electric prod used by police, etc.).
505,	Superconductor Technology: Apparatus, Material, Process, subclasses 150+ for high temperature (T_c 30 K) superconducting systems or devices, and subclasses 800+ for cross-reference art collections on superconductive systems or devices.
600,	Surgery, subclasses 9+ for application of a magnetic field to a body for therapy.
602,	Surgery: Splint, Brace, or Bandage, subclass 2, for a bandage including electrical application to a body.
606,	Surgery, especially subclasses 32+ , for electrical application to a body for surgical purposes.
607,	Surgery: Light, Thermal, and Electrical Application, subclasses 1+ for devices for applying electricity to the human body.

SUBCLASSES

[List of Patents for class 361 subclass 1]

SAFETY AND PROTECTION OF SYSTEMS AND DEVICES:

This subclass is indented under the class definition. Subject matter relating to the safety and protection of electrical systems and devices which include either fault sensing means which activate a protective means to remove a fault condition or a protective means which detects and removes the fault condition.

(1) Note. This and indented subclasses do not include, as a portion thereof, the protection and safety of human beings in the vicinity of electrical apparatus. Generally, the excluded protection and safety systems are classified in the subclass which relates to the environment in which the protected human being may be found. Thus, for example, electrical conductors having grounded guarding means to protect human personnel are classified as electric conductors.

SEE OR SEARCH THIS CLASS, SUBCLASS:

600+,

for switchboards and analogous devices, such as housings, some of which act as protective means.

SEE OR SEARCH CLASS:

174,	Electricity: Conductors and Insulators, subclasses 2+ for lightning protection systems consisting only of conductors and insulators, subclass 5 for electric shock hazard protective devices for protecting personnel, subclass 6 for earth ground, per se, and subclass 11 for electric conductor structure having means automatically responsive to the condition of the fluid which is associated with the electric conductors.
178,	Telegraphy, subclass 69 for telegraph line clearing and circuit maintenance systems.
307,	Electrical Transmission or Interconnection Systems, subclasses 326+ for safety or limit control features.
314,	Electric Lamp and Discharge Devices: Consumable Electrodes, subclasses 10+ for arc lamp systems having an automatic shunt or cutout.
315,	Electric Lamp and Discharge Devices: Systems, subclasses 88+ , especially subclass 91 for lamp and space discharge device systems having means to automatically substitute another lamp, space discharge devices, or electrode for the previous one under certain conditions of operation, subclasses 119+ for lamp and space discharge systems having an automatic shunt or cutout, and subclass 209 for lamp and space discharge device systems having periodic switch means in the supply circuit.
318,	Electricity: Motive Power Systems, subclass 434 for electric motor systems where the motor is significantly claimed having means to limit the motor load current, torque or force, as for the purpose of limiting an overload.
323,	Electricity: Power Supply or Regulation Systems, subclass 267 for condition sensing regulators with protection.
324,	Electricity: Measuring and Testing, subclass 110 for electric meter protection against electrical hazards and against the hazard of fraud.
330,	Amplifiers, subclasses 250+ for semiconductor amplifiers.
331,	Oscillators, subclass 62 for oscillators provided with oscillator circuit protective means, and subclass 63 for oscillator systems provided with protection or safety devices for personnel.
340,	Communications: Electrical, subclasses 635+ for electrical apparatus condition responsive signalling devices, particularly subclasses 649, 650, and 652 for grounding circuit, undesired circuit ground, and open circuit, condition responsive signalling devices, respectively.
363,	Electric Power Conversion Systems, subclasses 50+ for conversion systems having protective means.
379,	Telephonic Communications, subclass 437 for telephone systems having protective means.

[List of Patents for class 361 subclass 2]

Arc suppression at switching point (i.e., includes solid-state switch):

This subclass is indented under subclass 1. Subject matter for preventing or extinguishing arcs at the main switching points of the switching device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

159,	for arc suppression in control circuits for electromagnetic devices.

SEE OR SEARCH CLASS:

218,	High-Voltage Switches With Arc Preventing and Extinguishing Devices, subclasses 1+ for switches having arc preventing and extinguishing features.
333,	Wave Transmission Lines and Networks, subclasses 19 and 20 for differentiating, integrating and wave shaping networks, some of which can be used to prevent a rapid rise of voltage when a switching contact is opened.
363,	Electric Power Conversion Systems, subclasses 106+ and 177 for circuit-interrupter-type conversion systems which are usually provided with arc suppression or reducing means.

[List of Patents for class 361 subclass 3]

Synchronized or sequential opening or closing:

This subclass is indented under subclass 2. Subject matter with means to open or close the switch at a predetermined time or in a predetermined sequence.

SEE OR SEARCH CLASS:

323,	Electricity: Power Supply or Regulation Systems, subclasses 238 and 321.

4	Counter electromotive force:
	This subclass is indented under subclass 3. Subject matter with means for inserting an opposing voltage or current across the switching points to effectively cancel the arc producing surge.

[List of Patents for class 361 subclass 5]

With current sensitive control circuit:

This subclass is indented under subclass 3. Subject matter wherein the opening or closing control circuit is responsive to the in-line current. The in-line current is that which is switched at the main switching point.

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31,	and 32, for current responsive control circuitry in motor shunting circuits.
57,	for current responsive control circuitry in load shunting circuits.
63+,	for current responsive control circuitry in feeder distribution networks.
87,	for current responsive control circuitry in quantity comparison circuits.
93.1+,	for current responsive fault sensors.

SEE OR SEARCH CLASS:

307,	Electrical Transmission or Interconnection Systems, subclass 131 for current responsive switching systems.
340,	Communications: Electrical, subclass 664 for current characteristic actuated (e.g., line fault).

[List of Patents for class 361 subclass 6]

With voltage sensitive control circuit:

This subclass is indented under subclass 3. Subject matter wherein the opening or closing control circuit is responsive to the line voltage. The line voltage is that which is switched at the main switching points.

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21,	for voltage responsive control circuits in generator protective systems.
33+,	for voltage responsive control circuits in motor protective systems.
56,	for voltage responsive control circuits in load shunting systems.
86,	for voltage responsive control circuits in quantity comparison circuits.
88+,	for voltage responsive fault sensors.

SEE OR SEARCH CLASS:

307,	Electrical Transmission or Interconnection Systems, subclass 130 for voltage responsive switching circuits.
340,	Communications: Electrical, subclasses 660+ for voltage responsive signalling means.

[List of Patents for class 361 subclass 7]

With combined voltage and current sensitive control circuit:

This subclass is indented under subclass 3. Subject matter wherein the opening or closing control circuit is responsive to both the in-line current and the line voltage.

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30,	for combined voltage and current sensitive control circuits in motor protection circuits.
65+,	for combined voltage and current sensitive control circuits in feeder distribution networks.
79+,	for combined voltage and current sensitive control circuits in quantity comparison circuits.

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322,	Electricity: Single Generator Systems, subclass 25 for voltage and current responsive means for generator control circuits.

[List of Patents for class 361 subclass 8]

Shunt bypass:

This subclass is indented under subclass 3. Subject matter including a circuit in parallel with the main line switching points to drain away the arc causing surge.

SEE OR SEARCH THIS CLASS, SUBCLASS:

9,	for shunt bypass of main switch with sequentially inserted impedance.
13,	for nonsynchronized shunt bypass.

9	With sequentially inserted impedance:
	This subclass is indented under subclass 8. Subject matter which includes means to increase the shunt impedance in a predetermined manner.

[List of Patents for class 361 subclass 10]

By inserting series impedance:

This subclass is indented under subclass 2. Subject matter with means to place an impedance in-line with the main switching points to suppress the arc causing surge.

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58,	for impedance insertion in general.

SEE OR SEARCH CLASS:

218,	High-Voltage Switches With Arc Preventing and Extinguishing Devices, subclasses 1+ and 143+ for switches having arc preventing and extinguishing features with resistance insertion.

11	Nonlinear impedance:
	This subclass is indented under subclass 10. Subject matter with means to insert a nonlinear impedance (inductors, capacitors, thermistors, etc.) in series with the main switching points to suppress the arc causing surge.

[List of Patents for class 361 subclass 12]

By arc stretching (e.g., horn gap):

This subclass is indented under subclass 10. Subject matter wherein the lengthening of the arc effectively inserts an increasing amount of impedance in series with the switching points.

SEE OR SEARCH THIS CLASS, SUBCLASS:

137+,

for this subject matter in high voltage applications.

[List of Patents for class 361 subclass 13]

Shunt bypass of main switch:

This subclass is indented under subclass 2. Subject matter with a current path around the main line switching points to drain away the arc causing surge.

SEE OR SEARCH THIS CLASS, SUBCLASS:

8,	for synchronized shunt bypass circuits.
54+,	for load shunting where the load is not a switch.

SEE OR SEARCH CLASS:

218,	High-Voltage Switches With Arc Preventing and Extinguishing Devices, subclasses 8+ for arc preventing and extinguishing with auxiliary shunt.

[List of Patents for class 361 subclass 14]

Arc blowout for main breaker contact (e.g., electromagnet, gas, fluid, etc.):

This subclass is indented under subclass 2. Subject matter with means to extinguish the arc in a dynamic manner effectively increasing the length of the path of the arc.

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123,	133, 134, 135, and 137+, for this subject matter in high voltage applications.

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218,	High-Voltage Switches With Arc Preventing and Extinguishing Devices, subclasses 22+ for arc preventing and extinguishing with magnetic blowout.

[List of Patents for class 361 subclass 15]

Capacitor protection:

This subclass is indented under subclass 1. Subject matter for protecting capacitors from damage caused by excess heat and voltage or current surges.

(1) Note. The protective systems and devices included in this subclass are external to the capacitor housing and details to the capacitor structure are not included.

SEE OR SEARCH THIS CLASS, SUBCLASS:

272+,

for capacitors, per se, wherein the protective device is an integral part of the capacitor structure and details to the capacitor structure are included.

16	Series connected capacitors:
	This subclass is indented under subclass 15. Subject matter for preventing damage to in-line capacitors.

[List of Patents for class 361 subclass 17]

Shunt connected capacitors:

This subclass is indented under subclass 15. Subject matter for preventing damage to capacitors connected in parallel with the source or load.

SEE OR SEARCH THIS CLASS, SUBCLASS:

272+,

for electrostatic capacitors with protection or compensating means.

[List of Patents for class 361 subclass 18]

Voltage regulator protective circuits:

This subclass is indented under subclass 1. Subject matter wherein the fault sensing means for a voltage regulator system activates a protective means which interrupts the power to the load.

SEE OR SEARCH CLASS:

323,	Electricity: Power Supply or Regulation Systems, subclass 276 for voltage regulator systems wherein the current flow to the load is limited (not interrupted).

[List of Patents for class 361 subclass 19]

Superconductor protective circuits:

This subclass is indented under subclass 1. Subject matter comprising means for electrically preventing damage to a superconductor circuit or device.

SEE OR SEARCH CLASS:

327,	Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems, subclasses 366+ for superconductor gating circuits and subclasses 527+ for miscellaneous superconductor circuits.
505,	Superconductor Technology: Apparatus, Material, Process, particularly subclasses 150+ for high temperature (T_c 30 K) superconducting systems or devices, subclass 192 for capacitors having high temperature superconducting materials, and cross-reference art collections in subclass 850 for protective circuits for electromagnetic devices that are superconductive.

[List of Patents for class 361 subclass 20]

Generator protective circuits:

This subclass is indented under subclass 1. Subject matter comprising means for electrically preventing damage to a generator.

SEE OR SEARCH CLASS:

322,	Electricity: Single Generator Systems, for generator control circuits when the generator is significantly claimed.

[List of Patents for class 361 subclass 21]