US PATENT SUBCLASS 331 / 160
.~.~ With means to limit crystal current or voltage


Current as of: June, 1999
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331 /   HD   OSCILLATORS

154  DF  ELECTROMECHANICAL RESONATOR {4}
158  DF  .~ Crystal {6}
160.~.~ With means to limit crystal current or voltage


DEFINITION

Classification: 331/160

(under subclass 158) Subject matter wherein impedance means or automatic switching means are associated with the crystal to divert excessive currents away from the crystal or for sensing excessive currents through the crystal, or overvoltage across the crystal, to effectively by pass or disable the crystal circuit or to disconnect the crystal from the oscillator circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

62+, for oscillator systems combined with means to protect the oscillator from damage caused by undesired changes in load current, voltage, temperature or humidity.

183, for oscillator systems having means to automatically control the amplitude of the generated oscillations.