US PATENT SUBCLASS 73 / 54.04
.~.~ Friction tube (e.g., capillary)

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

53.01  DF  LIQUID ANALYSIS OR ANALYSIS OF THE SUSPENSION OF SOLIDS IN A LIQUID {15}
54.01  DF  .~ Viscosity {11}
54.04.~.~ Friction tube (e.g., capillary) {3}
54.05  DF  .~.~.~> Plural tubes {1}
54.07  DF  .~.~.~> By time interval of travel or flow rate measuring {1}
54.09  DF  .~.~.~> By pressure measuring

DEFINITION

Classification: 73/54.04

Friction tube (e.g., capillary):

(under subclass 54.01) Subject matter wherein the determination is made by using a small slender tubular conduit wherein the surface of the liquid in contact with the conduit forms an elevation or a depression due to either the

molecular attraction of the molecules of the liquid to each other or the attraction of the molecules of the liquid to the molecules of the surface of the tube.