US PATENT SUBCLASS 340 / 621
.~.~.~.~.~ Having sonic sensor

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
540  DF  .~ Specific condition {18}
603  DF  .~.~ Fluent material {7}
612  DF  .~.~.~ Material level {6}
618  DF  .~.~.~.~ Liquid {5}
621.~.~.~.~.~ Having sonic sensor

DEFINITION

Classification: 340/621

Having sonic sensor:

(under subclass 618) Subject matter wherein the liquid level is detected by a vibration responsive element, which may include a vibration transmitting element.

SEE OR SEARCH CLASS

73, Measuring and Testing,

290, for vibratory type liquid level measuring devices.

310, Electrical Generator or Motor Structure,

311+, for piezoelectric vibration transducers, per se.

367, Communications, Electrical: Acoustic Wave Systems and Devices, 99+, for liquid level measuring means.