US PATENT SUBCLASS 331 / 155
.~ With optical, piezoelectric or acoustic coupling means

Current as of: June, 1999
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331 /   HD   OSCILLATORS

154  DF  ELECTROMECHANICAL RESONATOR {4}
155.~ With optical, piezoelectric or acoustic coupling means

DEFINITION

Classification: 331/155

(under subclass 154) Subject matter wherein the mechanical resonator is coupled to the oscillator system by: (1) an electrooptical transducer, (2) a piezoelectric transducer, or (3) an electroacoustic transducer.

SEE OR SEARCH THIS CLASS, SUBCLASS:

158+, for oscillators wherein the piezoelectric crystal constitutes the frequency determining element of the oscillator.