US PATENT SUBCLASS 73 / 747
.~ U-tube liquid column


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

700  DF  FLUID PRESSURE GAUGE {20}
747.~ U-tube liquid column {2}
748  DF  .~.~> Sphygmomanometer
749  DF  .~.~> With electrical readout {1}


DEFINITION

Classification: 73/747

U-tube liquid column:

(under subclass 700) Subject matter comprising a column of liquid wherein the liquid is subjected to a pressure to be measured and the difference in the levels of the columns or the height of a column from a datum is read directly as an index of the pressure.