US PATENT SUBCLASS 73 / 1.25
.~.~ Orifice or restriction

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

1.01  DF  INSTRUMENT PROVING OR CALIBRATING {13}
1.16  DF  .~ Volume of flow, speed of flow, volume rate of flow, or mass rate of flow {12}
1.25.~.~ Orifice or restriction {1}
1.26  DF  .~.~.~> Nozzle or venturi

DEFINITION

Classification: 73/1.25

Orifice or restriction:

(under subclass 1.16) Subject matter wherein either (a) the proving or calibrating apparatus or (b) the device being proven or calibrated either comprises (1) an opening sending out a controlled amount of flow of the fluent material or (2) a structure allowing a controlled amount of flow of the fluent material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

861.52+, for utilizing an apparatus for measuring a differential device having a restriction to make a volume or rate of flow determination, especially subclasses 861.61+ for utilizing an apparatus for measuring a differential device having a restriction or orifice to make a volume or rate of flow determination.