US PATENT SUBCLASS 73 / 299
.~ Hydrostatic pressure type

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

290 R  DF  LIQUID LEVEL OR DEPTH GAUGE {13}
299.~ Hydrostatic pressure type {3}
300  DF  .~.~> Bathometer type
301  DF  .~.~> With electrically controlled indicator
302  DF  .~.~> With fluid displacement or replenishment {1}

DEFINITION

Classification: 73/299

(under subclass 290) Gauges wherein variations in depth are determined by measuring variations in static head at some point normally below the surface of the liquid. These devices usually comprise a pressure gauge with connections to said point below the surface of the liquid in the reservoir.

SEE OR SEARCH THIS CLASS, SUBCLASS:

32+, for gauges of this type combined with means for indicating the specific gravity of the liquid.

323+, for mere sight glasses.

700+, for pressure gauges, per se.