What follows are the subclasses from one class of the Manual of Classification for US patents. As you scroll through the list and encounter a class/subclass of interest, you can jump back to the top and retrieve patent titles by entering the class/subclass in the box below.
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Class Number: 290 Class Title: PRIME-MOVER DYNAMO PLANTS Subclass Subclass Number Title 1 R MISCELLANEOUS 1 A .Unitary plant 1 B .Air-cooled generator 1 C .Drive gearing 1 D .Chain drive 1 E .Spring motor 2 HEATING PLANTS 3 TRAIN 4 R PLURAL PRIME MOVER 4 A .Tie with another generator 4 B .Induction generator 4 C .Plural with combined drive 4 D .Plural prime movers with fluid interconnection 5 ALTERNATING CURRENT, ROTARY FIELD AND ARMATURE 6 MULTIPLE-ARMATURE DYNAMO 7 ELECTRIC CONTROL 8 .Excitation dynamo .Traction 9 ..Electric traction motor 10 ...With starting and generating dynamo 11 ....With generator 12 ....Rotary field and armature 13 ....Ignition 14 ...With generator 15 ....Rotary field and armature 16 ....Battery 17 ....Engine control 18 ...As starter 19 ....As generator 20 .....Rotary field and armature 21 ....Engine control 22 ..Starting and generating dynamo 23 ...Rotary field and armature 24 ....Engine control 25 ...Engine control 26 ....Ignition 27 ..Electric-starting motor with generator 28 ..Electric-starting motor 29 ..Rotary field and armature 30 R .Demand starters 30 A ..Standby source 30 B ..Standby service 31 .Starting and generating dynamo 32 ..With generator 33 ...Ignition 34 ..Engine control 35 ...Ignition 36 R .Electric-starting motor with generator 37 R ..Ignition 37 A ...Stop cranking responsive to generator output 36 A ..Automatic starters including centrifugally operated contactorss 38 R .Electric-starting motor 38 A ..Axially movable armatures 38 B ..Inertia starters 38 C ..Miscellaneous collection of automatic engine starters 38 D ..Stop cranking responsive to manifold conditions 38 E ..Automatic starter including pedal control 39 .Rotary field and armature 40 R .Engine control 41 ..Ignition 40 A ..Control in response to engine speed 40 B ..Control in response to generator line conditions 40 C ..Control in response to generator and prime mover conditions 40 D ..Control in response to a time standard 40 E ..Circuit resonant at given frequency 40 F ..Control in response to D. C. generator output 42 .Tide and wave motors 43 .Fluid-current motors 44 ..Wind 45 TRACTION 46 STARTING AND GENERATING DYNAMO 47 ELECTRIC-STARTING MOTOR WITH GENERATOR 48 ELECTRIC-STARTING MOTOR 49 ROTARY FIELD AND ARMATURE 50 BATTERY 51 ENGINE CONTROL 52 TURBOGENERATORS 53 TIDE AND WAVE MOTORS 54 FLUID-CURRENT MOTORS 55 .Wind