US Patent Class 290
PRIME-MOVER DYNAMO PLANTS



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Current as of: June, 1999
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  DF  CLASS NOTES
1 R  DF  MISCELLANEOUS
1 A  DF  .~ Unitary plant
1 B  DF  .~ Air-cooled generator
1 C  DF  .~ Drive gearing
1 D  DF  .~ Chain drive
1 E  DF  .~ Spring motor
2  DF  HEATING PLANTS
3  DF  TRAIN
4 R  DF  PLURAL PRIME MOVER
4 A  DF  .~ Tie with another generator
4 B  DF  .~ Induction generator
4 C  DF  .~ Plural with combined drive
4 D  DF  .~ Plural prime movers with fluid interconnection
5  DF  ALTERNATING CURRENT, ROTARY FIELD AND ARMATURE
6  DF  MULTIPLE-ARMATURE DYNAMO
7  DF  ELECTRIC CONTROL
8  DF  .~ Excitation dynamo
*  DD  .~ Traction
9  DF  .~.~ Electric traction motor
10  DF  .~.~.~ With starting and generating dynamo
11  DF  .~.~.~.~ With generator
12  DF  .~.~.~.~ Rotary field and armature
13  DF  .~.~.~.~ Ignition
14  DF  .~.~.~ With generator
15  DF  .~.~.~.~ Rotary field and armature
16  DF  .~.~.~.~ Battery
17  DF  .~.~.~.~ Engine control
18  DF  .~.~.~ As starter
19  DF  .~.~.~.~ As generator
20  DF  .~.~.~.~.~ Rotary field and armature
21  DF  .~.~.~.~ Engine control
22  DF  .~.~ Starting and generating dynamo
23  DF  .~.~.~ Rotary field and armature
24  DF  .~.~.~.~ Engine control
25  DF  .~.~.~ Engine control
26  DF  .~.~.~.~ Ignition
27  DF  .~.~ Electric-starting motor with generator
28  DF  .~.~ Electric-starting motor
29  DF  .~.~ Rotary field and armature
30 R  DF  .~ Demand starters
30 A  DF  .~.~ Standby source
30 B  DF  .~.~ Standby service
31  DF  .~ Starting and generating dynamo
32  DF  .~.~ With generator
33  DF  .~.~.~ Ignition
34  DF  .~.~ Engine control
35  DF  .~.~.~ Ignition
36 R  DF  .~ Electric-starting motor with generator
37 R  DF  .~.~ Ignition
37 A  DF  .~.~.~ Stop cranking responsive to generator output
36 A  DF  .~.~ Automatic starters including centrifugally operated contactors
38 R  DF  .~ Electric-starting motor
38 A  DF  .~.~ Axially movable armatures
38 B  DF  .~.~ Inertia starters
38 C  DF  .~.~ Miscellaneous collection of automatic engine starters
38 D  DF  .~.~ Stop cranking responsive to manifold conditions
38 E  DF  .~.~ Automatic starter including pedal control
39  DF  .~ Rotary field and armature
40 R  DF  .~ Engine control
41  DF  .~.~ Ignition
40 A  DF  .~.~ Control in response to engine speed
40 B  DF  .~.~ Control in response to generator line conditions
40 C  DF  .~.~ Control in response to generator and prime mover conditions
40 D  DF  .~.~ Control in response to a time standard
40 E  DF  .~.~ Circuit resonant at given frequency
40 F  DF  .~.~ Control in response to D. C. generator output
42  DF  .~ Tide and wave motors
43  DF  .~ Fluid-current motors
44  DF  .~.~ Wind
45  DF  TRACTION
46  DF  STARTING AND GENERATING DYNAMO
47  DF  ELECTRIC-STARTING MOTOR WITH GENERATOR
48  DF  ELECTRIC-STARTING MOTOR
49  DF  ROTARY FIELD AND ARMATURE
50  DF  BATTERY
51  DF  ENGINE CONTROL
52  DF  TURBOGENERATORS
53  DF  TIDE AND WAVE MOTORS
54  DF  FLUID-CURRENT MOTORS
55  DF  .~ Wind