US PATENT SUBCLASS 349 / 53
.~.~.~.~ Varistor

Current as of: June, 1999
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349 /   HD   LIQUID CRYSTAL CELLS, ELEMENTS AND SYSTEMS

19  DF  PARTICULAR EXCITATION OF LIQUID CRYSTAL {6}
33  DF  .~ Electrical excitation of liquid crystal (i.e., particular voltage pulses, AC vs. DC, threshold voltages, etc.) {8}
41  DF  .~.~ With particular switching device {2}
49  DF  .~.~.~ Two terminal nonlinear switching device (e.g., N-I-N, S-I-S, Ferroelectric, etc.) {3}
53.~.~.~.~ Varistor

DEFINITION

Classification: 349/53

Varistor:

(under subclass 49) Subject matter wherein the switching device has a two-electrode semiconductor device with a voltage-dependent nonlinear resistance that drops markedly as the applied voltage is increased.

SEE OR SEARCH CLASS

345, Computer Graphics Processing, Operator Interface Processing, and Selective Visual Display Systems,

91, for using varistor in a liquid crystal device.