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. 16, 1986
Filed:
Dec. 21, 1984
Applicant:
Inventors:
Stephen W Jaworowicz, Horseheads, NY (US);
John F Hall, Nutley, NJ (US);
Assignee:
North American Philips Lighting Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
315 73 ; 315 74 ; 337290 ;
Abstract
A high intensity discharge lamp with a safety switch which automatically shuts off the lamp upon rupture of the outer envelope. The switch is formed by a carbon rod disposed in the interior space between the arc tube and the outer envelope and connected in series with one of the electrodes so that the current flow through the rod maintains it at an elevated temperature during operation of the lamp. Upon rupture of the outer envelope, the carbon rod oxidizes and falls, thereby interrupting the electrical path to the electrodes.