US PATENT SUBCLASS 73 / 721
.~.~.~.~.~.~ Piezoresistive

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

700  DF  FLUID PRESSURE GAUGE {20}
715  DF  .~ Diaphragm {6}
716  DF  .~.~ Multiple and/or differential {1}
717  DF  .~.~.~ With electrical readout {3}
719  DF  .~.~.~.~ Resistive {1}
720  DF  .~.~.~.~.~ Strain gauge {1}
721.~.~.~.~.~.~ Piezoresistive

DEFINITION

Classification: 73/721

Piezoresistive:

(under subclass 720) Subject matter wherein the element is made of a semiconductor material whose resistance to the flow of electrical current is varied by the application of pressure thereto.

SEE OR SEARCH THIS CLASS, SUBCLASS:

727, for diaphragm-type gauges involving semiconductors.

754, for electrical-type pressure gauges involving semiconductor devices.

SEE OR SEARCH CLASS

338, Electrical Resistors,

4, for strain gauge type fluid or gas pressure actuated.