US PATENT SUBCLASS 318 / 293
.~.~.~ Reversing polarity of current supplied to armature circuit

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

280  DF  MOTOR-REVERSING {4}
287  DF  .~ Armature or primary circuit control {2}
291  DF  .~.~ Armature or primary current reversal {2}
293.~.~.~ Reversing polarity of current supplied to armature circuit {2}
294  DF  .~.~.~.~> Wheatstone bridge type
295  DF  .~.~.~.~> Potentiometer-controlled

DEFINITION

Classification: 318/293

(under subclass 291) Subject matter in which means are provided for reversing polarity of the current supplied to the armature or primary circuit of the motor.

SEE OR SEARCH THIS CLASS, SUBCLASS:

140+, for the subject matter in generator-fed motor systems.

300+, for motor reversing systems where the polarity of the field circuit current is reversed.

373+, for motor braking by "plugging" wherein the armature current polarity is reversed.

SEE OR SEARCH CLASS 307, Electrical Transmission or Interconnection Systems,

138, for polarity reversing systems for electrical switch contacts.