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:
Jun. 17, 1980
Filed:
Feb. 21, 1978
D Colin Phillips, Monroeville, PA (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
A protective system for electrical apparatus mounted in a vault which has an opening to the atmosphere. Overheating of the electrical apparatus is distinguished from tobacco smoke, engine exhaust fumes, and other air borne particulates, by an ion chamber monitor and a thermally activated material in the vault which decomposes at a predetermined elevated temperature indicative of overheating. The material is selected to decompose above 300.degree. C. and produce a gas which decreases the self-recombination rate of the ion in the ion detector monitor to increase the ion current. An alarm is generated on a predetermined increase in ion current, instead of upon a decrease, such as caused by particulates.