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US 5,290,704 AGranted
Method of detecting organic solvent vapors
AssigneeValence Technology, Inc.
InventorOn-Kok Chang
Life of this patent
Estimating the term…
Abstract
A photometric detector is used to detect the presence of organic solvent vapors in the air. The detector need only be exposed to the air in the area to be tested. The optical density, i.e. darkness of the color of the detector determines the cumulative amount of solvent vapor exposure and the rate at which the dark color develops determines the concentration of solvent vapors in the air. This method can be used to quickly and easily test for harmful levels of toxic organic solvent vapors in the workplace or elsewhere.
Claims9
A method of detecting organic solvent vapor comprises the steps of:
- (a) exposing a solvent vapor detector to solvent vapor;
- and
- (b) photometrically measuring the optical density of said detector;
- wherein said detector comprises:
- a substrate;
- a binder means which is substantially soluble to said solvent vapor;
- an electron donating chromogenic composition dispersed on said substrate in connection with said binder means;
- and
- an electron accepting composition, which forms a color with said chromogenic composition, dispersed on said substrate in connection with said binder means.
6 more elements
Dependencies are inferred from the claim text.