US PATENT SUBCLASS 310 / 323.21
.~.~.~.~ Detector (e.g., sensor)

Current as of: June, 1999
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310 /   HD   ELECTRICAL GENERATOR OR MOTOR STRUCTURE

300  DF  NON-DYNAMOELECTRIC {4}
311  DF  .~ Piezoelectric elements and devices {17}
321  DF  .~.~ Combined with resonant structure {4}
323.01  DF  .~.~.~ Direct mechanical coupling {5}
323.21.~.~.~.~ Detector (e.g., sensor)

DEFINITION

Classification: 310/323.21

Detector (e.g. sensor):

(under subclass 323.01) Subject matter wherein the piezoelectric element has a characteristic which changes in response to a change in a physical parameter or condition, and assessment is made of the physical parameter or condition.

SEE OR SEARCH CLASS

73, Measuring and Testing,

35.11, for a piezoelectric vibration sensor, for detecting engine knock. Subclasses 290, 721, 727, 763+, and 861.18+ for various force or pressure measuring and indicating devices or systems which may utilize a piezoelectric transducing element. Subclasses 763+ for strain sensors which may use a piezoelectric element, subclasses 861.18 for flow meters which may use a piezoelectric element, subclass 290 for depth or liquid level gases which may utilize a piezoelectric element, and Digest 4 for various piezoelectric measuring and testing devices.