US PATENT SUBCLASS 73 / 61.69
.~.~.~.~ By optical measurement

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


73 /   HD   MEASURING AND TESTING

53.01  DF  LIQUID ANALYSIS OR ANALYSIS OF THE SUSPENSION OF SOLIDS IN A LIQUID {15}
61.41  DF  .~ Content or effect of a constituent of a liquid mixture {8}
61.63  DF  .~.~ Settling or filtering ability {2}
61.65  DF  .~.~.~ Sedimentation rate {4}
61.69.~.~.~.~ By optical measurement

DEFINITION

Classification: 73/61.69

By optical measurement:

(under subclass 61.65) Subject matter wherein the determination is made by measuring the effect of the sediment on light.

SEE OR SEARCH CLASS

250, Radiant Energy, appropriate subclasses for a photocell, per se, and for analyzing a liquid utilizing invisible light which is modified by transmission through or emission by the liquid being tested wherein the modified light is tested.

356, Optics: Measuring and Testing,

436, for measuring visible light transmission or absorption of a liquid wherein the test involves no manipulation other than that involved in optical testing.