US PATENT SUBCLASS 73 / 1.89-- .~ Roughness or hardness

US PATENT SUBCLASS 73 / 1.89
.~ Roughness or hardness

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

1.01	DF	INSTRUMENT PROVING OR CALIBRATING {13}
1.89		.~ Roughness or hardness

DEFINITION

Classification: 73/1.89

Roughness or hardness:

(under subclass 1.01) Subject matter wherein the device being proven or calibrated produces an output signal in response to a condition being sensed and wherein the proving, the calibrating, the testing or the adjustment of the device measures (a) the amount of unevenness of a surface or (b) the amount of resistance of a surface to penetration of an indentor into the surface or the amount of resistance of a surface to scratching.

SEE OR SEARCH THIS CLASS, SUBCLASS:

84+, for measuring or testing hardness, per se.