The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 05, 1989
Filed:
Feb. 26, 1986
Applicant:
Inventors:
Assignee:
Siemens Aktiengesellschaft, Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
422 86 ; 422 91 ; 422 52 ; 422 56 ; 422 57 ; 436169 ; 436172 ;
Abstract
The present invention is directed to a chemically sensitive component including an optical filter that reversibly changes color or transparency in response to a gas or vapor to be determined or detected. The optical filter comprises a mixture of a basic or acid color former or dye of the triphenyl methane system and a complementary acid or basic compound which may be embedded in a matrix and/or applied as a coating to a carrier. The optical filter's change in color or transparency can be measured photoelectronically, e.g., with a luminescent diode as a light source and a photodiode or a phototransistor as a light detector.