US PATENT SUBCLASS 73 / 31.01
.~ Ambient air

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

23.2  DF  GAS ANALYSIS {15}
31.01.~ Ambient air {1}
31.02  DF  .~.~> Impurity

DEFINITION

Classification: 73/31.01

Ambient air:

(under subclass 23.2) Subject matter wherein the gas being tested is the naturally occurring mixture of gases surrounding the earth.

SEE OR SEARCH THIS CLASS, SUBCLASS:

28.01+, for measuring the solid content of air not originating in the outer space surrounding the Earth.