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:
Sep. 28, 1976
Filed:
Oct. 18, 1973
Aristide R DeCaro, Edison, NJ (US);
Westinghouse Electric Corporation, Pittsburgh, PA (US);
Abstract
An electric lamp having a sealed-beam or single-ended domed type envelope that contains a tungsten filament and a halogen additive is provided with a specular coating of gold, palladium, platinum, or rhodium on a selected portion of its inner surface. The metal coating serves as a non-reactive interior reflector which does not getter the halogen additive or contaminate the lamp atmosphere and thus optically controls the light output of the lamp without interfering with the halogen-tungsten regenerative cycle. In an alternative embodiment, the outer surface of the envelope is properly contoured (to provide a parabolic surface, for example) and then coated with a thin layer of aluminum, silver, nickel or chromium which serves as an exterior reflector. The regenerative tungsten-halogen cycle is thus achieved in a reflector type lamp without the separate halogen lamp component heretofore required in such lamps.