US Patent Class 307
ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS



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Current as of: June, 1999
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  DF  CLASS NOTES
1  DF  SUPERIMPOSED UNLIKE CURRENTS
2  DF  .~ AC and DC sources
3  DF  .~ Different frequencies or phase
4  DF  .~ Different voltages
5  DF  .~.~ Series-connected
6  DF  .~.~.~ Plural converters
7  DF  .~.~.~.~ Induction transformer
8  DF  .~.~.~ Plural generators
9.1  DF  VEHICLE MOUNTED SYSTEMS
10.1  DF  .~ Automobile
10.2  DF  .~.~ Antitheft
10.3  DF  .~.~.~ Ignition or starting circuit lock
10.4  DF  .~.~.~.~ Manual code input (e.g., push button)
10.5  DF  .~.~.~.~ Coded record input (e.g., IC card)
10.6  DF  .~.~ Ignition or starter circuits
10.7  DF  .~.~ Battery protection
10.8  DF  .~.~ Lighting circuits
11  DF  PLURAL LOAD CIRCUIT SYSTEMS
12  DF  .~ Common conductor or return type
13  DF  .~.~ Polyphase
14  DF  .~.~.~ Phase balancing
15  DF  .~.~ Voltage divider type
16  DF  .~.~ Plural output generators
17  DF  .~ Transformer connections
18  DF  .~ Plural sources of supply
19  DF  .~.~ Interconnected for energy transfer
20  DF  .~.~.~ With control of magnitude of energy transfer
21  DF  .~.~.~ Diverse sources
22  DF  .~.~.~.~ AC and DC
23  DF  .~.~ Substitute or alternate source
24  DF  .~.~ With control of magnitude of current or power
25  DF  .~.~ Diverse sources
26  DF  .~.~.~ AC and DC
27  DF  .~.~.~ Different frequencies
28  DF  .~.~.~ Different voltages
29  DF  .~.~ Selectively connected loads and/or sources
30  DF  .~ Anticoupling of load circuits through same source
31  DF  .~ Control of current or power
32  DF  .~.~ Load current proportioning or dividing
33  DF  .~.~ Constant magnitude control
34  DF  .~.~.~ By control of one or more load circuits
35  DF  .~.~ Limit control
36  DF  .~ Serially connected load circuits
37  DF  .~.~ Selective series-parallel connections
38  DF  .~ Selectively connected or controlled load circuits
39  DF  .~.~ Condition responsive
40  DF  .~.~ Code-controlled
41  DF  .~.~ Sequential or alternating
42  DF  .~ Circuit arrangements or layouts
43  DF  PLURAL SUPPLY CIRCUITS OR SOURCES
44  DF  .~ One source floats across or compensates for other source
45  DF  .~.~ With intervening converter
46  DF  .~.~.~ Storage battery or accumulator-type source
47  DF  .~.~ Dynamoelectric-type source
48  DF  .~.~ Storage battery or accumulator-type source
49  DF  .~.~.~ With series-connected auxiliary source
50  DF  .~.~.~ Tap-changing or variable number of cells
51  DF  .~ Circulating- or inter-current control or prevention
52  DF  .~ Load current control
53  DF  .~.~ Load current division
54  DF  .~.~.~ Serially connected sources
55  DF  .~.~.~ Fixed or predetermined ratio
56  DF  .~.~.~.~ Diverse-or unlike-type sources
57  DF  .~.~.~.~ Plural generators
58  DF  .~.~.~.~ Plural converters
59  DF  .~.~.~ Peak or excess load
60  DF  .~.~ Constant load or current
61  DF  .~.~.~ Serially connected sources
62  DF  .~.~ Load-limiting
63  DF  .~.~ Serially connected sources
64  DF  .~ Substitute or emergency source
65  DF  .~.~ Plural substitute sources
66  DF  .~.~ Storage battery or accumulator
67  DF  .~.~.~ With intervening dynamoelectric machine
68  DF  .~.~ Dynamoelectric
69  DF  .~ Sources distributed along load circuit
70  DF  .~ Load transfer without paralleling sources
71  DF  .~ Series-parallel connection of sources
72  DF  .~ Diverse or unlike electrical characteristics
73  DF  .~.~ Differing frequencies
74  DF  .~.~ Differing capacities
75  DF  .~.~ Differing voltages
76  DF  .~.~.~ Generator sources
77  DF  .~ Series-connected sources
78  DF  .~.~ Generator sources
80  DF  .~ Selective or optional sources
81  DF  .~.~ Predetermined sequence
82  DF  .~ Plural converters
83  DF  .~ Plural transformers
84  DF  .~ Plural generators
85  DF  .~ Connecting or disconnecting
86  DF  .~.~ Condition responsive
87  DF  .~.~.~ Attainment of voltage, frequency or phase relationship
400  DF  ELECTRETS
401  DF  NONLINEAR REACTOR SYSTEMS (E.G., SATURABLE)
402  DF  .~ Parametrons
403  DF  .~.~ Thin film parametrons
404  DF  .~.~ Using logic circuits
405  DF  .~.~ Using pump energizer
406  DF  .~ Magnetic flip-flops
407  DF  .~ Logic circuits
408  DF  .~.~ Multiaperture
409  DF  .~.~ Clocking, delay or transmission line
410  DF  .~.~ Nor, Not logic circuit
411  DF  .~.~ Exclusive Or, And logic circuit
412  DF  .~ Driver circuits
413  DF  .~ Signal sensor (e.g., current or frequency)
414  DF  .~ Magnetic trigger devices
415  DF  .~ Magnetic switching circuits
416  DF  .~ Amplifiers using nonlinear reactors (i.e., magnetic amplifiers)
417  DF  .~.~ With transistors
418  DF  .~.~ With feedback
419  DF  .~ Magnetic pulse generator
420  DF  .~.~ Using multivibrator
421  DF  .~.~ With specified output waveform
422  DF  .~ Multiaperture
423  DF  .~.~ Three apertures or ladder
424  DF  .~ Parametric frequency converter
326  DF  PERSONNEL SAFETY OR LIMIT CONTROL FEATURES
327  DF  .~ Parasitic current suppression
328  DF  .~ Interlock
89  DF  ANTI-INDUCTION OR COUPLING TO OTHER SYSTEMS
90  DF  .~ Inducing current control
91  DF  .~ Magnetic or electrostatic field control (e.g., shielding)
95  DF  ANTI-ELECTROLYSIS
96  DF  INTERMITTENT REGULATORY INTERRUPTION OF SYSTEM
97  DF  .~ Condition responsive
98  DF  COMBINED IMPEDANCE AND SWITCH SYSTEMS
99  DF  .~ Condition responsive switch
100  DF  SHUNTING OR SHORT CIRCUITING SYSTEMS
101  DF  RESIDUAL OR REMANENT MAGNETISM CONTROL
102  DF  STABILIZED, ANTI-HUNTING OR ANTIOSCILLATION SYSTEMS
103  DF  WITH LINE DROP COMPENSATION
104  DF  ELECTROMAGNET OR HIGHLY INDUCTIVE SYSTEMS
105  DF  WITH HARMONIC FILTER OR NEUTRALIZER
106  DF  WAVE FORM OR WAVE SHAPE DETERMINATIVE OR PULSE-PRODUCING SYSTEMS
107  DF  .~ With rectification or derectification
108  DF  .~ With capacitor
109  DF  CAPACITOR
110  DF  .~ Parallel-charge, series-discharge (e.g., voltage doublers)
111  DF  NONRESPONSIVE-TO-FREQUENCY-CHANGE SYSTEMS
650  DF  WITH NONSWITCHING MEANS RESPONSIVE TO EXTERNAL NONELECTRICAL CONDITION
651  DF  .~ Temperature responsive
652  DF  .~ Responsive to approach or passage of an object
653  DF  .~ Flame responsive (e.g., flame acts as a rectifier in circuit)
112  DF  SWITCHING SYSTEMS
113  DF  .~ Plural switches
114  DF  .~.~ Lazy-man switch type
115  DF  .~.~ Selectively actuated
116  DF  .~ Condition responsive
117  DF  .~.~ Light, heat, vibratory or radiant energy
118  DF  .~.~ Fluid pressure, density, level, velocity or humidity
119  DF  .~.~ Mechanical force
120  DF  .~.~.~ Speed, centrifugal or kinetic force
121  DF  .~.~.~.~ Inertia or acceleration
122  DF  .~.~.~.~ Direction of rotation
123  DF  .~.~.~.~ Differential speed between two bodies
124  DF  .~.~.~.~ Torque
125  DF  .~.~ Electrical
126  DF  .~.~.~ Power or energy
127  DF  .~.~.~ Polarity, phase sequence or reverse flow
128  DF  .~.~.~ AC or DC discriminating
129  DF  .~.~.~ Frequency
130  DF  .~.~.~ Voltage
131  DF  .~.~.~ Current
132 R  DF  .~ Repetitive make and break
132 E  DF  .~.~ Electronically controlled relay
132 EA  DF  .~.~.~ Responsive to physical condition
132 T  DF  .~.~ Thermal relay
132 V  DF  .~.~ Vibrating relay
132 M  DF  .~.~ Miscellaneous
134  DF  .~ With operation facilitating feature
135  DF  .~.~ Preliminary reduction in current or voltage of system
137  DF  .~.~ Switch contact conditioning
138  DF  .~.~.~ Polarity reversing
139  DF  .~ Switch actuation
140  DF  .~.~ Power circuit controlled
141  DF  .~.~ With time delay or retardation means
141.4  DF  .~.~.~ Electrically initiated
141.8  DF  .~.~.~ Series connected switches
142  DF  .~.~ With locking, holding or braking means
143  DF  .~.~ Electrical actuator
144  DF  .~.~ Fluid-pressure actuator
145  DF  WITH CURRENT COLLECTION OR TRANSFER
146  DF  UNIDIRECTIONAL CONDUCTOR SYSTEMS
147  DF  CONDUCTOR ARRANGEMENTS OR STRUCTURE
148  DF  .~ Multipart-conductor current equalization
149  DF  MISCELLANEOUS SYSTEMS
150  DF  .~ Power packs
151  DF  .~ Conversion systems
152  DF  .~ Rate of change responsive systems
153  DF  .~ Generator control systems
154  DF  .~ For particular load device
155  DF  .~.~ Plural diverse load devices
156  DF  .~.~.~ Structural load device combinations
157  DF  .~.~ Lamp or discharge device