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:
Apr. 05, 1977
Filed:
Jan. 31, 1975
Laurence H Cadoff, Pittsburgh, PA (US);
Westinghouse Electric Corporation, Pittsburgh, PA (US);
Abstract
Refractory-oxide-based elongated incandescent radiator has a body portion which principally comprises refractory oxide with from about 8 volume percent to 20 volume percent of refractory metal dispersed therein. Such members are normally not sufficiently conducting to enable them to be self-resistance heated to a condition of incandescence. The room-temperature conductivity of such a member is greatly increased by heating the initially sintered member during fabrication thereof to a temperature of at least about 1400.degree. C while simultaneously subjecting the heated member to the influence of an electric field having an intensity of at least about 5 volts/mm. The completely processed members can be self-resistance heated to a condition of incandescence without the use of supplemental heaters. In its preferred form the radiator carries thereon a thin oxide coating, in order to improve the visible-radiation-emission characteristics. These radiators have utility as incandescent elements in light sources.