US PATENT SUBCLASS 73 / 438
.~ Hydrostatic pressure type

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

32 R  DF  SPECIFIC GRAVITY OR DENSITY OF LIQUID OR SOLID {7}
438.~ Hydrostatic pressure type {1}
439  DF  .~.~> Bubble tube

DEFINITION

Classification: 73/438

(under subclass 32) Devices operating on the principle of measurement of the hydrostatic pressure of a fixed head of test material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

299+, for similar art where the density is constant and the

hydrostatic pressure is an index of liquid level.