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:
Feb. 02, 1982
Filed:
Apr. 21, 1980
Frank X McNally, Venetia, PA (US);
National Mine Corporation, Pittsburgh, PA (US);
Abstract
An improvement is provided in apparatus used to detect combustible gases, which embodies a Wheatstone bridge circuit including a refractory-coated detector element having thereon a catalyst for promoting oxidation of the combustible gas to be detected constituting one leg of the bridge and a refractory-coated reference element constituting a second leg of the bridge. The improvement, in its broadest aspect, consists in using a mixture of palladium, palladium oxide and nickel oxide as the catalyst on the detector element. In addition, an improved reference element is provided which has a coating of either sodium metasilicate or lead borate deposited thereon.