US PATENT SUBCLASS 73 / 439
.~.~ Bubble tube

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  DF  .~ Hydrostatic pressure type {1}
439.~.~ Bubble tube

DEFINITION

Classification: 73/439

(under subclass 438) Devices having a submerged tube from which escape gas bubbles, the resistance to which is a measure of the specific gravity of the submerging liquid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

302, for similar devices for measuring liquid level.