US PATENT SUBCLASS 73 / 53.05
.~ Lubricant testing

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}
53.05.~ Lubricant testing {2}
53.06  DF  .~.~> By analyzing a characteristic of a measuring surface
53.07  DF  .~.~> By solid content

DEFINITION

Classification: 73/53.05

Lubricant testing:

(under subclass 53.01) Subject matter wherein the determination is made by measuring the capability of a substance to reduce friction, heat, and wear when it is introduced as a film between two relatively movable solid surfaces.

SEE OR SEARCH THIS CLASS, SUBCLASS:

10, for an apparatus or a process for determining the effect of a lubricant upon the frictional drag between two relatively movable solid surfaces.

SEE OR SEARCH CLASS

250, Radiant Energy,

301, for an apparatus or method for utilizing invisible radiant energy in testing for the presence of, the concentration of or contamination in oil.

356, Optics: Measuring and Testing,

70, for determining the contamination of oil by measuring a characteristic of electromagnetic wave energy in the visible range.