Manual of U.S. Patent Classification
as of June 30, 2000

Class
307
ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS

Class definitions may be accessed by clicking on the class title, above.
Subclass definitions may be accessed by clicking on the subclass number, below.

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Subclass		Title
ClassTitle		===> ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS
1		SUPERIMPOSED UNLIKE CURRENTS
2		. AC and DC sources
3		. Different frequencies or phase
4		. Different voltages
5		. . Series-connected
6		. . . Plural converters
7		. . . . Induction transformer
8		. . . Plural generators
9.1		VEHICLE MOUNTED SYSTEMS
10.1		. Automobile
10.2		. . Antitheft
10.3		. . . Ignition or starting circuit lock
10.4		. . . . Manual code input (e.g., push button)
10.5		. . . . Coded record input (e.g., IC card)
10.6		. . Ignition or starter circuits
10.7		. . Battery protection
10.8		. . Lighting circuits
11		PLURAL LOAD CIRCUIT SYSTEMS
12		. Common conductor or return type
13		. . Polyphase
14		. . . Phase balancing
15		. . Voltage divider type
16		. . Plural output generators
17		. Transformer connections
18		. Plural sources of supply
19		. . Interconnected for energy transfer
20		. . . With control of magnitude of energy transfer
21		. . . Diverse sources
22		. . . . AC and DC
23		. . Substitute or alternate source
24		. . With control of magnitude of current or power
25		. . Diverse sources
26		. . . AC and DC
27		. . . Different frequencies
28		. . . Different voltages
29		. . Selectively connected loads and/or sources
30		. Anticoupling of load circuits through same source
31		. Control of current or power
32		. . Load current proportioning or dividing
33		. . Constant magnitude control
34		. . . By control of one or more load circuits
35		. . Limit control
36		. Serially connected load circuits
37		. . Selective series-parallel connections
38		. Selectively connected or controlled load circuits
39		. . Condition responsive
40		. . Code-controlled
41		. . Sequential or alternating
42		. Circuit arrangements or layouts
43		PLURAL SUPPLY CIRCUITS OR SOURCES
44		. One source floats across or compensates for other source
45		. . With intervening converter
46		. . . Storage battery or accumulator-type source
47		. . Dynamoelectric-type source
48		. . Storage battery or accumulator-type source
49		. . . With series-connected auxiliary source
50		. . . Tap-changing or variable number of cells
51		. Circulating- or inter-current control or prevention
52		. Load current control
53		. . Load current division
54		. . . Serially connected sources
55		. . . Fixed or predetermined ratio
56		. . . . Diverse-or unlike-type sources
57		. . . . Plural generators
58		. . . . Plural converters
59		. . . Peak or excess load
60		. . Constant load or current
61		. . . Serially connected sources
62		. . Load-limiting
63		. . Serially connected sources
64		. Substitute or emergency source
65		. . Plural substitute sources
66		. . Storage battery or accumulator
67		. . . With intervening dynamoelectric machine
68		. . Dynamoelectric
69		. Sources distributed along load circuit
70		. Load transfer without paralleling sources
71		. Series-parallel connection of sources
72		. Diverse or unlike electrical characteristics
73		. . Differing frequencies
74		. . Differing capacities
75		. . Differing voltages
76		. . . Generator sources
77		. Series-connected sources
78		. . Generator sources
80		. Selective or optional sources
81		. . Predetermined sequence
82		. Plural converters
83		. Plural transformers
84		. Plural generators
85		. Connecting or disconnecting
86		. . Condition responsive
87		. . . Attainment of voltage, frequency or phase relationship
400		ELECTRETS
401		NONLINEAR REACTOR SYSTEMS (E.G., SATURABLE)
402		. Parametrons
403		. . Thin film parametrons
404		. . Using logic circuits
405		. . Using pump energizer
406		. Magnetic flip-flops
407		. Logic circuits
408		. . Multiaperture
409		. . Clocking, delay or transmission line
410		. . Nor, Not logic circuit
411		. . Exclusive Or, And logic circuit
412		. Driver circuits
413		. Signal sensor (e.g., current or frequency)
414		. Magnetic trigger devices
415		. Magnetic switching circuits
416		. Amplifiers using nonlinear reactors (i.e., magnetic amplifiers)
417		. . With transistors
418		. . With feedback
419		. Magnetic pulse generator
420		. . Using multivibrator
421		. . With specified output waveform
422		. Multiaperture
423		. . Three apertures or ladder
424		. Parametric frequency converter
326		PERSONNEL SAFETY OR LIMIT CONTROL FEATURES
327		. Parasitic current suppression
328		. Interlock
89		ANTI-INDUCTION OR COUPLING TO OTHER SYSTEMS
90		. Inducing current control
91		. Magnetic or electrostatic field control (e.g., shielding)
95		ANTI-ELECTROLYSIS
96		INTERMITTENT REGULATORY INTERRUPTION OF SYSTEM
97		. Condition responsive
98		COMBINED IMPEDANCE AND SWITCH SYSTEMS
99		. Condition responsive switch
100		SHUNTING OR SHORT CIRCUITING SYSTEMS
101		RESIDUAL OR REMANENT MAGNETISM CONTROL
102		STABILIZED, ANTI-HUNTING OR ANTIOSCILLATION SYSTEMS
103		WITH LINE DROP COMPENSATION
104		ELECTROMAGNET OR HIGHLY INDUCTIVE SYSTEMS
105		WITH HARMONIC FILTER OR NEUTRALIZER
106		WAVE FORM OR WAVE SHAPE DETERMINATIVE OR PULSE-PRODUCING SYSTEMS
107		. With rectification or derectification
108		. With capacitor
109		CAPACITOR
110		. Parallel-charge, series-discharge (e.g., voltage doublers)
111		NONRESPONSIVE-TO-FREQUENCY-CHANGE SYSTEMS
650		WITH NONSWITCHING MEANS RESPONSIVE TO EXTERNAL NONELECTRICAL CONDITION
651		. Temperature responsive
652		. Responsive to approach or passage of an object
653		. Flame responsive (e.g., flame acts as a rectifier in circuit)
112		SWITCHING SYSTEMS
113		. Plural switches
114		. . Lazy-man switch type
115		. . Selectively actuated
116		. Condition responsive
117		. . Light, heat, vibratory or radiant energy
118		. . Fluid pressure, density, level, velocity or humidity
119		. . Mechanical force
120		. . . Speed, centrifugal or kinetic force
121		. . . . Inertia or acceleration
122		. . . . Direction of rotation
123		. . . . Differential speed between two bodies
124		. . . . Torque
125		. . Electrical
126		. . . Power or energy
127		. . . Polarity, phase sequence or reverse flow
128		. . . AC or DC discriminating
129		. . . Frequency
130		. . . Voltage
131		. . . Current
132R		. Repetitive make and break
132E		. . Electronically controlled relay
132EA		. . . Responsive to physical condition
132T		. . Thermal relay
132V		. . Vibrating relay
132M		. . Miscellaneous
134		. With operation facilitating feature
135		. . Preliminary reduction in current or voltage of system
137		. . Switch contact conditioning
138		. . . Polarity reversing
139		. Switch actuation
140		. . Power circuit controlled
141		. . With time delay or retardation means
141.4		. . . Electrically initiated
141.8		. . . Series connected switches
142		. . With locking, holding or braking means
143		. . Electrical actuator
144		. . Fluid-pressure actuator
145		WITH CURRENT COLLECTION OR TRANSFER
146		UNIDIRECTIONAL CONDUCTOR SYSTEMS
147		CONDUCTOR ARRANGEMENTS OR STRUCTURE
148		. Multipart-conductor current equalization
149		MISCELLANEOUS SYSTEMS
150		. Power packs
151		. Conversion systems
152		. Rate of change responsive systems
153		. Generator control systems
154		. For particular load device
155		. . Plural diverse load devices
156		. . . Structural load device combinations
157		. . Lamp or discharge device

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Last Modified: 6 October 2000