US PATENT SUBCLASS 335 / 94
.~.~.~ Tuned or resonant at a particular frequency

Current as of: June, 1999
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335 /   HD   ELECTRICITY: MAGNETICALLY OPERATED SWITCHES, MAGNETS, AND ELECTROMAGNETS

2  DF  ELECTROMAGNETICALLY ACTUATED SWITCHES {30}
87  DF  .~ Periodic (e.g., vibrators) {6}
93  DF  .~.~ Vibratory reed or other periodic contact actuator {1}
94.~.~.~ Tuned or resonant at a particular frequency

DEFINITION

Classification: 335/94

(under subclass 93) Subject matter wherein the vibratory reed or other contact actuating means is pretuned or inherently resonant at a particular predetermined frequency or band of frequencies.

(1) Note. Tuned mechanical resonators such as reed or piezo crystal devices when used as means for measuring the frequency of a cyclic current will be found in Class 324, especially subclass 76.49, and electrical wave filters of the electro mechanical transducer type will be found in Class 333, subclasses 186+.

SEE OR SEARCH THIS CLASS, SUBCLASS:

101, below, the alternating current responsive switches which are responsive to a predetermined or synchronous frequency.