US PATENT SUBCLASS 73 / 54.39
.~.~ Shearing torque between parallel surfaces

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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}
54.39.~.~ Shearing torque between parallel surfaces

DEFINITION

Classification: 73/54.39

Shearing torque between parallel surfaces:

(under subclass 54.01) Subject matter wherein the determination is made by measuring the force which is necessary to shear a film of liquid disposed between closely adjacent relatively slidable surfaces.

SEE OR SEARCH THIS CLASS, SUBCLASS:

54.24+, for similar subject matter wherein a reaction force is measured.