US PATENT SUBCLASS 340 / 388.2
.~.~ Alternating current

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

384.1  DF  AUDIBLE INDICATION {11}
388.1  DF  .~ Diaphragm (e.g., horn or buzzer) {7}
388.2.~.~ Alternating current

DEFINITION

Classification: 340/388.2

Alternating current:

(under subclass 388.1) Subject matter wherein the vibration of the diaphragm is caused by a current that changes the polarity with time in such a manner that the current reaches maximum in one direction, decreases to zero, reverses itself, and reaches minimum in the opposite direction.

SEE OR SEARCH THIS CLASS, SUBCLASS:

401.1, for alternating current used in percussion type sound producers.