US PATENT SUBCLASS 318 / 300
.~.~ Field-circuit current reversed

Current as of: June, 1999
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318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

280  DF  MOTOR-REVERSING {4}
296  DF  .~ Field circuit control {2}
300.~.~ Field-circuit current reversed

DEFINITION

Classification: 318/300

(under subclass 296) Subject matter in which means are provided for reversing the flow of current in the motor field producing winding.

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293+, for motor systems having means for reversing the motor by reversing the current in the armature or primary circuit thereof.

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307, Electrical Transmission or Interconnection Systems,

127, for switching systems responsive to polarity or reverse current.

322, Electricity: Single Generator Systems, 6, for generator systems having means to control the polarity by controlling the generator excitation.