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:
Oct. 04, 1977
Filed:
Sep. 27, 1976
Cornelis Adrianus Jacobs, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
Electric discharge lamps having a ceramic lamp vessel and current leadthroughs of niobium or tantalum cannot be operated in a nitrogen-containing atmosphere or in air due to attack of the current leadthroughs by the surrounding gas. According to the invention, those parts of the current leadthroughs which during operation have a temperature of more than 500.degree. C and more than 350.degree. C, respectively, are screened from the surrounding gas by means of ceramic mouldings which are connected to the current leadthrough in a gas-tight manner by means of sealing material. As a result of this the lamps according to the invention can be operated in a nitrogen-containing atmosphere and in air respectively.