US PATENT SUBCLASS 73 / 78
HARDNESS

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

78HARDNESS {2}
79  DF  .~> Scleroscope or rebound
81  DF  .~> By penetrator or indentor {4}

DEFINITION

Classification: 73/78

(under the class definition) Subject matter for direct measurement of the hardness of materials.

SEE OR SEARCH THIS CLASS, SUBCLASS:

7, where abrasive or milling characteristic is employed as an index of hardness.

12.01+, for other tests in which the specimen is subjected to one or more sudden blows.

104, for durability of cutting edges as an index of hardness.

821, for tests of the crushing point of material, sometimes erroneously designated as "hardness".

SEE OR SEARCH CLASS 100, Presses, appropriate subclasses for presses not elsewhere provided for.