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:
Dec. 08, 1981
Filed:
Nov. 19, 1979
Philip J Nalepa, Oak Ridge, NJ (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
A high-intensity discharge lamp which has a lamp current-interrupting device in series circuit with the arc tube which is sensitive to any breach occurring in the protective outer envelope. The current-interrupting constituent of the device initially incorporated into the lamp comprises vanadium sesquioxide. The device has predetermined dimensions and an initial predetermined operating resistance. During normal operation of the lamp the device operates at a predetermined temperature sufficiently low so that said device is stable in the presence of the non-reactive atmosphere enclosed by the outer envelope. The predetermined temperature also being sufficiently high so that upon a breach occurring in the outer envelope permitting oxygen to enter, the vanadium sesquioxide rapidly converts to vanadium pentoxide to interrupt the continuity of the power circuit to the arc tube and prevent the operation of the lamp.