Class Definition for Class 307 - ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS

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CLASS 307,	ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS
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SECTION I - CLASS DEFINITION

This is the residual class for all subject matter, not elsewhere classified, relating to electrical transmission or interconnection systems.

(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 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 307 takes, under the class definition, only subject matter relating to electrical transmission or interconnection systems 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 and definitions of these classes.

(3) Note. Many mechanical classes containing electrical disclosures, as where a machine has, as part thereof, some electrical features, such as controls. Consequently, in appropriate instances, the search must extend to the class or classes which relate to the environment in which the electrical disclosure might be found.

SECTION II - REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:

84,	Music, subclasses 600+ for electric organs having interconnection and switching systems.
174,	Electricity: Conductors and Insulators, appropriate subclasses, for the physical structure of conductors. Also note subclasses 2+ for lightning rod systems and subclasses 5+ for systems for protecting people and animals from electric shock hazard.
178,	Telegraphy, appropriate subclasses, for telegraph systems.
191,	Electricity: Transmission to Vehicles, for systems for distributing electricity between a stationary point and a movable vehicle. Note particularly subclasses 2+ .
200,	Electricity: Circuit Makers and Breakers, appropriate subclasses, for electric switches and circuit breakers.
204,	Chemistry: Electrical and Wave Energy, appropriate subclasses, for electric systems utilized in electro-chemical apparatus, such as electrolytic and cathode sputtering apparatus.
219,	Electric Heating, appropriate subclasses, especially subclasses 482+ for a heating device having a power supply and voltage or current regulation or current control means.
246,	Railway Switches and Signals, appropriate subclasses, for electric circuits utilized in railway switches and signals.
250,	Radiant Energy, appropriate subclasses, for the detection of nuclear or invisible electromagnetic radiation, the testing of material by nuclear or invisible electromagnetic radiation, infrared or thermal document barriers, fluorescent and phosphorescent applications, invisible radiant energy generation controlling means and supports for tested material radiation sources and radiation detectors.
290,	Prime-Mover Dynamo Plants, appropriate subclasses, for electric circuits utilized in prime mover dynamo plants.
310,	Electrical Generator or Motor Structure, appropriate subclasses, for the physical structure of electric generators and motors and electromagnetic clutches and for the circuits that relate to electromagnetic clutches.
313,	Electric Lamp and Discharge Devices, appropriate subclasses, for the physical structure of electric lamp and discharge devices, per se.
314,	Electric Lamp and Discharge Devices: Consumable Electrodes, for arc lamp circuits.
315,	Electric Lamp and Discharge Devices: Systems, appropriate subclasses for cathode rays tube circuits and electric lamp and space discharge device circuits.
318,	Electricity: Motive Power Systems, appropriate subclasses for electric circuits utilized in electric motor systems.
320,	Electricity: Battery or Capacitor Charging or Discharging, appropriate subclass for a battery or capacitor charging or discharging circuit.
322,	Electricity: Single Generator Systems, appropriate subclasses for circuits utilized in single generator systems.
323,	Electricity: Power Supply or Regulation Systems, appropriate subclasses, for circuits utilized in voltage magnitude and phase control systems.
324,	Electricity: Measuring and Testing, appropriate subclasses for circuits utilized in electrical measuring, testing and sensing systems.
326,	Electronic Digital Logic Circuitry, appropriate subclasses for an electronic digital logic circuit.
327,	Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems, appropriate subclasses for miscellaneous active device nonlinear circuits.
332,	Modulators, appropriate subclasses for modulating systems.
333,	Wave Transmission Lines and Networks, appropriate subclasses for transmission lines and networks, utilized in communications.
335,	Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, appropriate subclasses for magnetically operated switches and circuit breakers.
340,	Communications: Electrical, appropriate subclasses for miscellaneous signaling systems.
342,	Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation), appropriate subclasses for radio wave energy communication systems and antennas.
345,	Computer Graphics Processing and Selective Visual Display Systems, subclasses 418 through 475for computer graphics processing.
346,	Recorders, appropriate subclasses, especially subclasses 33+ for systems utilized with recorders.
348,	Television, appropriate subclasses for television systems.
358,	Facsimile and Static Presentation Processing, subclasses 1.1 through 1.18for data processing for static presentation on fixed medium (e.g., printer), subclasses 500-540 for natural color facsimile, subclasses 400-498 for facsimile, and subclasses 296-304 for recording apparatus in facsimile.
361,	Electricity: Electrical Systems and Devices, appropriate subclasses for miscellaneous electrical systems. Note subclasses 1+ for safety and protective systems, and and subclasses 139+ for control circuits for electromagnetic devices.
363,	Electric Power Conversion Systems, appropriate subclasses for circuits utilized in electric conversion systems.
365,	Static Information Storage and Retrieval, subclasses 185.01+ for floating gate memory storage (e.g., flash memory), subclass 73 for recirculation of information in a storage read/write system, subclass 78 for plural shift register memory devices, subclass 80 for magnetic shift register, per se, subclasses 129+ for storage systems using a particular storage element, subclass 189.011 for read/write circuits peculiar to a storage and retrieval system, and subclass 230 for addressing circuits peculiar to a storage and retrieval system.
370,	Multiplex Communications, appropriate subclasses for multiplexing systems.
373,	Industrial Electric Heating Furnaces, subclasses 70 , 102+, 135+, and 147 for electric furnaces having significant electrical circuits.
377,	Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems, for electrical pulse counters, dividers and shift registers.
378,	X-Ray or Gamma Ray Systems or Devices, subclasses 91+ for circuits combined with X-ray devices.
379,	Telephonic Communications, appropriate subclasses, for telephone systems.
386,	Television Signal Processing for Dynamic Recording or Reproducing, appropriate subclasses for television recording systems.
445,	Electric Lamp or Space Discharge Component or Device Manufacturing, appropriate subclasses, for circuits utilized in the manufacture or repair of electric lamp or electric space discharge devices.
700,	Data Processing: Generic Control Systems or Specific Applications, subclasses 1 through 89for generic data processing control systems and subclasses 245-264 for data processing of robot control systems.
704,	Data Processing: Speech Signal Processing, Linguistics, Language Translation and Audio Compression/Decompression, subclasses 200+ for artificial intelligence systems that process speech signals.
706,	Data Processing: Intelligent Processing Systems and Methods, various subclasses for artificial intelligence systems that represent, apply, and acquire knowledge.
708,	Electrical Computers: Arithmetic Processing and Calculating, subclasses 1+ for electric hybrid computers, subclasses 100+ for electric digital calculating computers, and subclasses 800+ for electric analog computers.
712,	Electrical Computers and Digital Data Processing Systems: Processing Architectures and Instruction Processing (e.g., Processors), subclass 300 for byte level interactions.
714,	Error Detection/Correction and Fault Detection/Recovery, subclasses 1+ for reliability and availability in digital processing systems.

SUBCLASSES

[List of Patents for class 307 subclass 1]

SUPERIMPOSED UNLIKE CURRENTS

This subclass is indented under the class definition. Subject matter relating to systems having a common portion in which unlike currents flow or unlike potentials exist.

(1) Note. One of the currents, for example, may be a direct current while the other current, for example, may be a pulse current.

SEE OR SEARCH CLASS:

178,	Telegraphy, subclass 49 for telegraphy having plural different types of currents superimposed upon a common circuit.
330,	Amplifiers, subclasses 69 , 84, 124+, 147, and 295 for amplifier systems involving plural signal input signal sources which may be superimposed.
340,	Communications: Electrical, appropriate subclasses for miscellaneous communication systems having means for superimposing upon a common circuit plural types of current. Note particularly subclasses 288 , 531+, 693.1+, 870.07, 870.11+, and 870.15.
370,	Multiplex Communications, appropriate subclasses for multiplex systems.
379,	Telephonic Communications, subclasses 66 and 90+ for telephone systems having means for superimposing upon a single circuit plural types of current.

[List of Patents for class 307 subclass 2]

AC and DC sources

This subclass is indented under subclass 1. Subject matter having means for supplying alternating and direct currents.

(1) Note. The alternating and direct current, for example, may be the superimposed unlike currents.

SEE OR SEARCH THIS CLASS, SUBCLASS:

22,	and 26, for this subject matter.

[List of Patents for class 307 subclass 3]

Different frequencies or phase

This subclass is indented under subclass 1. Subject matter in which the superimposed unlike currents have different frequencies or phase.

SEE OR SEARCH THIS CLASS, SUBCLASS:

27,	for similar subject matter.

SEE OR SEARCH CLASS:

84,	Music, subclasses 600+ , especially subclasses 600+ for electric organs having means for superimposing currents of different frequency upon a common circuit.
332,	Modulators, appropriate subclasses for systems for introducing frequency components by a modulation process.
363,	Electric Power Conversion Systems, subclasses 1+ , 39+, and 157+ for electric power conversion systems having means to introduce or to eliminate certain frequency components.

[List of Patents for class 307 subclass 4]

Different voltages

This subclass is indented under subclass 1. Subject matter in which the superimposed unlike currents are currents of different voltage.

(1) Note. One current, for example, may be the current from a source of constant voltage while the other current, for example, may be a current from a source of adjustable voltage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

28,	for similar subject matter.
43+,	for this subject matter.

SEE OR SEARCH CLASS:

324,	Electricity: Measuring and Testing, subclasses 98+ for systems for measuring voltage by balancing an unknown voltage against a known voltage in a common circuit.

[List of Patents for class 307 subclass 5]

Series-connected

This subclass is indented under subclass 4. Subject matter in which the different voltages are connected in series opposition to a voltage which has undesired variations, so as to produce a resultant output which is constant.

SEE OR SEARCH CLASS:

323,	Electricity: Power Supply or Regulation Systems, subclasses 220 through 354, inclusive, for this subject matter.

[List of Patents for class 307 subclass 6]

Plural converters

This subclass is indented under subclass 5. Subject matter having plural converters.

(1) Note. The plural converters, for example, may be the plural sources of series connected voltages.

SEE OR SEARCH CLASS:

363,	Electric Power Conversion Systems, appropriate subclasses for conversion systems for converting electricity, obtained from a single source and having a single output.

[List of Patents for class 307 subclass 7]

Induction transformer

This subclass is indented under subclass 6. Subject matter having an induction transformer.

SEE OR SEARCH CLASS:

323,	Electricity: Power Supply or Regulation Systems, subclasses 247 , 301, 305, and 328 for transformer systems.
336,	Inductor Devices, appropriate subclasses for the structure of transformers and inductive reactors.

[List of Patents for class 307 subclass 8]

Plural generators

This subclass is indented under subclass 5. Subject matter having plural generators.

SEE OR SEARCH THIS CLASS, SUBCLASS:

84,	and 153, for this subject matter.

SEE OR SEARCH CLASS:

290,	Prime-Mover Dynamo Plants, appropriate subclasses for electric generator systems having significant prime mover features.
322,	Electricity: Single Generator Systems, appropriate subclasses for systems having a single generator.

[List of Patents for class 307 subclass 9.1]

9.1

VEHICLE MOUNTED SYSTEMS:

This subclass is indented under the class definition. Subject matter comprising systems of electrical distribution mounted in vehicles.

(1) Note. This subclass includes, for example, systems for distributing electric power along the length of a train made up of cars which can be coupled or uncoupled.

SEE OR SEARCH CLASS:

187,	Elevator, Industrial Lift Truck, or Stationary Lift for Vehicle, subclasses 277+ for an elevator car control having an electrical component and subclass 413 for an electrical service line connection to an elevator car or an arrangement of such an electrical service line.
191,	Electricity: Transmission to Vehicles, subclass 2 for systems having significant means for distributing electricity between a stationary supply and a moving vehicle.
213,	Railway Draft Appliances, subclasses 1.3+ for combined couplers and electrical connectors for use in railway vehicles.
246,	Railway Switches and Signals, appropriate subclasses for train mounted systems utilized in connection with signalling or track switching. Note particularly subclasses 64+ and 166.1.
315,	Electric Lamp and Discharge Devices: Systems, subclasses 77+ for miscellaneous vehicle mounted systems having lamps or space discharge devices.
320,	Electricity: Battery or Capacitor Charging or Discharging, appropriate subclass for a charging system for a vehicular battery.
340,	Communications: Electrical, subclasses 425.5+ for signalling systems utilized in vehicles.

10.1	Automobile:
	This subclass is indented under subclass 9.1. Subject matter in which the vehicle is specifically a motor vehicle (i.e., an automobile).

[List of Patents for class 307 subclass 10.2]

10.2

Antitheft:

This subclass is indented under subclass 10.1. Subject matter including systems or devices which prevent unauthorized entry or use of an automobile.

SEE OR SEARCH CLASS:

180,	Motor Vehicles, subclasses 287+ for antitheft systems which prevent unauthorized use by controlling one or more systems during operation of the vehicle, as by: (1) application of the brakes, (2) stoppage of the fuel supply, or (3) opening of the ignition circuit in response to a timer.
340,	Communications: Electrical, subclasses 426.1 through 426.36for alarms or indicators activated in response to an attempt at unauthorized entry or use of a vehicle.

10.3	Ignition or starting circuit lock:
	This subclass is indented under subclass 10.2. Subject matter in which the antitheft device prevents activation of the ignition or starting circuits of an automobile.

[List of Patents for class 307 subclass 10.4]

10.4

Manual code input (e.g., push button):

This subclass is indented under subclass 10.3. Subject matter in which a plurality of manually operable coded push buttons are provided to activate the ignition or starting circuit of an automobile.

SEE OR SEARCH CLASS:

361,	Electricity: Electrical Systems and Devices, subclass 171 for electrical systems and devices having a relay or solenoid activated by code pulses.

[List of Patents for class 307 subclass 10.5]

10.5

Coded record input (e.g., IC card):

This subclass is indented under subclass 10.3. Subject matter in which the ignition or starting system of an automobile is activated in response to the insertion of a coded record (such as a magnetic or integrated circuit card) into an appropriate reading device.

SEE OR SEARCH CLASS:

235,	Registers, appropriate subclasses for coded record responsive systems, per se.

[List of Patents for class 307 subclass 10.6]

10.6

Ignition or starter circuits:

This subclass is indented under subclass 10.1. Subject matter including circuits which supply electrical power to a starter motor or to an ignition system of an automobile.

SEE OR SEARCH CLASS:

123,	Internal-Combustion Engines, appropriate subclasses for ignition systems or starting devices which activate internal-combustion engines.

[List of Patents for class 307 subclass 10.7]

10.7

Battery protection:

This subclass is indented under subclass 10.1. Subject matter including device for protecting a battery of an automobile.

SEE OR SEARCH CLASS:

340,	Communications: Electrical, subclasses 636.1 through 636.21for battery condition responsive indicating systems.
361,	Electricity: Electrical Systems and Devices, subclasses 1+ for other means to provide for the safety and protection of electrical systems and devices.

[List of Patents for class 307 subclass 10.8]

10.8

Lighting circuits:

This subclass is indented under subclass 10.1. Subject matter including circuits for supplying electrical power to the various illuminating lamps of an automobile.

SEE OR SEARCH CLASS:

315,	Electric Lamp and Discharge Devices: Systems, appropriate subclasses for systems which supply electrical power to lamp and discharge devices and which include recitation of the actual device. Note particularly subclasses 76+ for vehicle head light systems having the lamp as a part thereof.
340,	Communications: Electrical, subclasses 425.5+ for vehicle lighting circuits used for signalling purposes.

[List of Patents for class 307 subclass 11]

PLURAL LOAD CIRCUIT SYSTEMS

This subclass is indented under the class definition. Subject matter relating to systems having plural load circuits.

SEE OR SEARCH CLASS:

174,	Electricity: Conductors and Insulators, subclass 43 for overhead wire distributing systems having means for establishing branch connections.
315,	Electric Lamp and Discharge Devices: Systems, appropriate subclasses for systems having plural cathode ray tubes, plural gas discharge devices or plural lamps.
318,	Electricity: Motive Power Systems, subclasses 34+ for systems having plural electric motors.
327,	Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems, appropriate subclasses for miscellaneous systems employing plural space discharge active elements.
330,	Amplifiers, subclasses 73 , 84, 124+, 148, and 295 for amplifier circuits having plural loads.
333,	Wave Transmission Lines and Networks, subclasses 1+ for plural channel systems utilized in communications.
378,	X-Ray or Gamma Ray Systems or Devices, subclass 92 for X-ray electrical systems having plural X-ray tubes.

[List of Patents for class 307 subclass 12]

Common conductor or return type

This subclass is indented under subclass 11. Subject matter in which the plural load circuits have a common conductor or a common return.

(1) Note. This subclass relates, for example, to three wire direct current systems.

SEE OR SEARCH CLASS:

310,	Electrical Generator or Motor Structure, subclasses 112+ and 126 for balancer sets, per se.
323,	Electricity: Power Supply or Regulation Systems, subclass 202 for balancer set systems.

[List of Patents for class 307 subclass 13]

Polyphase

This subclass is indented under subclass 12. Subject matter relating to polyphase systems.

SEE OR SEARCH CLASS:

315,	Electric Lamp and Discharge Devices: Systems, subclasses 137+ for polyphase systems for energizing space discharge devices or lamps.
323,	Electricity: Power Supply or Regulation Systems, appropriate subclasses for voltage control polyphase systems. Note section VIII, subsection B of the class definition for a statement of the line between polyphase voltage control systems to be found in Class 323 and elsewhere.
363,	Electric Power Conversion Systems, subclasses 1+ and 148+ for phase conversion systems for converting one number of phases to another number of phases.

14	Phase balancing
	This subclass is indented under subclass 13. Subject matter relating to phase balancing systems for polyphase circuits.

[List of Patents for class 307 subclass 15]

Voltage divider type

This subclass is indented under subclass 12. Subject matter having plural loads connected in series.

(1) Note. The system, for example, may be provided with means to control the voltage drop across the two loads in a certain ratio.

SEE OR SEARCH CLASS:

315,	Electric Lamp and Discharge Devices: Systems, subclasses 185+ for serially connected plural space discharge device or lamp systems, such as constant current systems.

[List of Patents for class 307 subclass 16]

Plural output generators

This subclass is indented under subclass 12. Subject matter having plural output generators.

(1) Note. A single generator, for example, may have plural windings, some of which supply one output circuit and some of which supply another output circuit.

[List of Patents for class 307 subclass 17]

Transformer connections

This subclass is indented under subclass 11. Subject matter relating to transformer connections.

(1) Note. The subclass relates, for example, to transformer systems wherein a transformer has plural outputs.

SEE OR SEARCH CLASS:

323,	Electricity: Power Supply or Regulation Systems, subclasses 215 , 247, 301, 305, 328, and 355 for transformer systems.

[List of Patents for class 307 subclass 18]

Plural sources of supply

This subclass is indented under subclass 11. Subject matter having plural sources of supply for the plural load circuits.

SEE OR SEARCH CLASS:

318,	Electricity: Motive Power Systems, subclasses 105+ for plural motor systems having plural sources of supply.

19	Interconnected for energy transfer
	This subclass is indented under subclass 18. Subject matter having means for interconnecting the plural sources of supply in such manner that energy may be transferred from one source of supply to another source of supply.

[List of Patents for class 307 subclass 20]

With control of magnitude of energy transfer

This subclass is indented under subclass 19. Subject matter having means to control the magnitude of the energy which is transferred between one source of supply and another source of supply.

SEE OR SEARCH CLASS:

323,	Electricity: Power Supply or Regulation Systems, for pertinent subclass (es) as determined by schedule rewiew.

[List of Patents for class 307 subclass 21]

Diverse sources

This subclass is indented under subclass 19. Subject matter having diverse sources of energy supply.

(1) Note. The diverse sources, for example, may be two alternating current transmission systems of different frequency which are not interconnected otherwise than by the circuits related to the subject matter of the subclass.

[List of Patents for class 307 subclass 22]

AC and DC

This subclass is indented under subclass 21. Subject matter in which the diverse sources of supply are sources of alternating current and direct current.

SEE OR SEARCH THIS CLASS, SUBCLASS:

2,	and 26, for this subject matter.

[List of Patents for class 307 subclass 23]

Substitute or alternate source

This subclass is indented under subclass 18. Subject matter having a substitute or an alternate source of energy.

(1) Note. This substitute or alternate source of energy, for example, may be a standby generator.

SEE OR SEARCH THIS CLASS, SUBCLASS:

64+,	for this subject matter.

SEE OR SEARCH CLASS:

333,	Wave Transmission Lines and Networks, subclass 3 for plural channel communication systems having means to automatically substitute one channel for another.

[List of Patents for class 307 subclass 24]

With control of magnitude of current or power

This subclass is indented under subclass 18. Subject matter having means to control the magnitude of power or current.

SEE OR SEARCH THIS CLASS, SUBCLASS:

51,	55+ and 62, for this subject matter.

SEE OR SEARCH CLASS:

323,	Electricity: Power Supply or Regulation Systems, for single source systems.

25	Diverse sources
	This subclass is indented under subclass 18. Subject matter in which the plural sources of supply are diverse.

[List of Patents for class 307 subclass 26]

AC and DC

This subclass is indented under subclass 25. Subject matter in which the two sources of supply are AC and DC sources.

SEE OR SEARCH THIS CLASS, SUBCLASS:

2,	and 22, for this subject matter.

[List of Patents for class 307 subclass 27]

Different frequencies

This subclass is indented under subclass 25. Subject matter in which the diverse sources of energy have different frequencies.

SEE OR SEARCH THIS CLASS, SUBCLASS:

3,	for this subject matter.

[List of Patents for class 307 subclass 28]

Different voltages

This subclass is indented under subclass 25. Subject matter in which the diverse source of supply have different voltages.

SEE OR SEARCH THIS CLASS, SUBCLASS:

4+,	for this subject matter.

[List of Patents for class 307 subclass 29]

Selectively connected loads and/or sources

This subclass is indented under subclass 18. Subject matter having means for selectively connecting either the plural loads or the plural sources.

(1) Note. The loads or sources, for example, may be selectively connected in accordance with the magnitude of the power being drawn.

SEE OR SEARCH THIS CLASS, SUBCLASS:

38+,	for this subject matter.
125+,	for switching systems responsive to an electric condition.

[List of Patents for class 307 subclass 30]

Anticoupling of load circuits through same source

This subclass is indented under subclass 11. Subject matter having means to prevent coupling between one load circuit and another load circuit due to the internal impedance of a common source.

(1) Note. The anticoupling means may, for example, be means for tuning the two load circuits to a certain condition of resonance to prevent coupling.

SEE OR SEARCH CLASS:

174,	Electricity: Conductors and Insulators, subclasses 32+ for electric conductors having means to prevent inductive effects between adjacent circuits. Also consult the search notes to these subclasses for related art.
333,	Wave Transmission Lines and Networks, subclasses 1+ , especially subclasses 4+ for plural channel communication systems having means to prevent couplin