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. 19, 1988
Filed:
Jul. 29, 1987
Roger A Hume, Ohn, GB;
Thorn Emi plc, London, GB;
Abstract
A lead wire arrangement used in the pinch seal of a tungsten halogen incandescent or air burning discharge lamp. The outer lead wires are made of an oxidation resistant material having a melting point significantly lower than the temperature surrounding the foil and lead wire arrangement during the pinch sealing process. Because the temperature reached during pinch sealing is of the order 2,000.degree. C. conventionally outer lead wires have been made of a highly refractory material, for example, molybdenum which has to be coated with platinum to prevent oxidation. The invention uses materials having significantly lower melting points than 2,000.degree. C. which are also oxidation resistant thus avoiding the use of the expensive platinum. Suitable materials for the outer lead wires include titanium wire, titanium coated wire, nickel/iron alloys and titanium/molybdenum alloys.