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:
Nov. 16, 1982
Filed:
Feb. 17, 1981
Applicant:
Inventor:
Shih-Chia Chang, Troy, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
73 23 ;
Abstract
In a preferred embodiment, the concentration of hydrogen or other reducing species in a gaseous sample is determined by measuring the electrical resistance of a zinc oxide thin film semiconductor having a gas-sensing surface exposed to the sample and carrying a thin spotted coating of a palladium-gold alloy. The palladium-gold alloy substantially improves the sensitivity of the resistance of the zinc oxide film to the presence of the reducing species.