US PATENT SUBCLASS 322 / 32
.~.~ Frequency responsive devices or networks

Current as of: June, 1999
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322 /   HD   ELECTRICITY: SINGLE GENERATOR SYSTEMS

17  DF  AUTOMATIC CONTROL OF GENERATOR OR DRIVING MEANS {13}
29  DF  .~ Speed or frequency of generator {3}
32.~.~ Frequency responsive devices or networks

DEFINITION

Classification: 322/32

(under subclass 29) Subject matter wherein a frequency responsive device or network is utilized to produce a control dependent on the speed of frequency for controlling the generator or driving means.

(1) Note. The frequency responsive device or network may take such diverse forms as a synchronous motor, a frequency meter or a tuned circuit.

SEE OR SEARCH CLASS

324, Electricity: Measuring and Testing,

76.39+, for electric frequency measuring.

331, Oscillators, 1+, for electrical oscillation generating systems having a phase or frequency sensing means for automatically stabilizing the frequency of the generated oscillations.

388, Electricity: Motor Control Systems,

800+, especially 805, 814 and 820 for running-speed control systems including frequency responsive feedback devices or networks.