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. 23, 1986
Filed:
Oct. 15, 1984
Peter W Crossley, Havant, GB;
Bernard F Fellerman, Hayling Island, GB;
Graham H Goodchild, Portchester, GB;
THORN EMI Domestic Appliances Limited, London, GB;
Abstract
A thermal limiting device for controlling one or more sources of infra-red radiation, preferably tungsten-halogen lamps, mounted in heating apparatus, consists of a metallic wire arranged to de-energize the sources when it is subjected to a predetermined temperature. The wire is accommodated within a quartz tube, which selectively transmits and absorbs infra-red radiation of different wavelengths. An infra-red reflective coating is applied either to the wire or to the inner surface of the quartz tube to prevent infra-red radiation transmitted through the quartz tube from reaching the wire, while infra-red radiation of a particular wavelength, which is absorbed by the quartz tube, heats the wire by thermal conduction and convection, so that the limiter is primarily responsive to radiation only of that particular wavelength.