US PATENT SUBCLASS 73 / 81
.~ By penetrator or indentor

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

78  DF  HARDNESS {2}
81.~ By penetrator or indentor {4}
82  DF  .~.~> Impact type
83  DF  .~.~> With successive minor and major load
84  DF  .~.~> Soil bearing capacity
85  DF  .~.~> Penetrator element

DEFINITION

Classification: 73/81

(under subclass 78) Subject matter wherein hardness is measured in terms of its resistance to a penetrator or to indentation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

78+, for resistance to drilling as index of hardness.

700+, for fluid pressure gauges, other than those which measure the hardness of the tire as an index of fluid pressure which are in this subclass (81).