US PATENT SUBCLASS 307 / 73
.~.~ Differing frequencies

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307 /   HD   ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS

43  DF  PLURAL SUPPLY CIRCUITS OR SOURCES {14}
72  DF  .~ Diverse or unlike electrical characteristics {3}
73.~.~ Differing frequencies

DEFINITION

Classification: 307/73

(under subclass 72) Subject matter in which the diverse

sources are different frequencies.

SEE OR SEARCH CLASS

318, Electricity: Motive Power Systems,

807+, for electric motor systems having sources of different frequency of electric power, for regulating the speed of the motor.

388, Electricity: Motor Control Systems,

805, 814 and 820 for running-speed control systems in which the frequency of a feedback signal is compared to the frequency of an input signal.