US PATENT SUBCLASS 175 / 48
.~ Measuring or indicating drilling fluid (1) pressure, or (2) rate of flow


Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

40  DF  WITH SIGNALING, INDICATING, TESTING OR MEASURING {8}
48.~ Measuring or indicating drilling fluid (1) pressure, or (2) rate of flow


DEFINITION

Classification: 175/48

(under subclass 40) Subject matter relating to a drilling fluid system forming a part of the boring means and a step or means to (1) measure or indicate the pressure of the drilling fluid or (2) measure or indicate the rate of flow of said drilling fluid at a specified location in said system.

SEE OR SEARCH CLASS

73, Measuring and Testing,

290+, 700+ and 861+ for volume or rate of flow meters, liquid level or depth gauges, and fluid pressure gauges, respectively.

340, Communications: Electrical,

603+, for electrical automatic fluent material responsive indicating systems.