US PATENT SUBCLASS 73 / 1.03
.~.~ Reference standard

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

1.01  DF  INSTRUMENT PROVING OR CALIBRATING {13}
1.02  DF  .~ Gas or liquid analyzer {2}
1.03.~.~ Reference standard {2}
1.04  DF  .~.~.~> Permeable outlet or flawed element
1.05  DF  .~.~.~> Piston, sprayer, nozzle, or orifice

DEFINITION

Classification: 73/1.03

Reference standard:

(under subclass 1.02) Subject matter including a means for providing a reference criterion and wherein the apparatus for proving or calibrating uses the reference criterion for comparison purposes for proving or calibrating the device.

SEE OR SEARCH CLASS

204, Chemistry: Electrical and Wave Energy,

427+, for an electrolytic gas sample sensor, per se, combined with a gas reference material; and subclass 435 for a standard reference electrode in an electrolytic analysis or testing apparatus.

356, Optics: Measuring and Testing,

243, for an apparatus for measuring or testing visible light including structure forming a basis for comparison with a specimen or a portion thereof under test.

436, Chemistry: Analytical and Immunological Testing, particularly

8+, for a composition for standardization, calibration, simulation, or processes of use in preparation for chemical testing.