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:
Apr. 17, 1990
Filed:
Jan. 23, 1989
Applicant:
Inventors:
Robert L Novack, Evans City, PA (US);
John E Tozier, Wexford, PA (US);
Assignee:
Bacharach, Inc., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
73 2 / ; 338 34 ; 422 98 ;
Abstract
The present invention is directed towards a low power, solid state gas sensor and method of making the same. The sensor comprises a heating element formed from a wire coiled about an axis, a sensing whisker placed inside the heating coil substantially in plane with said axis, and a metal oxide semiconductor material whose resistance varies with the object gas concentration. The gas sensors of this type operate at less than 150 mA. In addition, gas sensors of the present invention exhibit a substantially linear response over a significant concentration of the object gas.