US PATENT SUBCLASS 73 / 23.26
.~.~.~.~ Gradient

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

23.2  DF  GAS ANALYSIS {15}
23.21  DF  .~ With compensation detail (for error or drift correction, etc.) {2}
23.22  DF  .~.~ For gas chromatography {4}
23.25  DF  .~.~.~ Temperature {1}
23.26.~.~.~.~ Gradient

DEFINITION

Classification: 73/23.26

Gradient:

(under subclass 23.25) Subject matter wherein the condition being corrected or adjusted is the temperature variations along the column or columns of the chromatography.