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:
Mar. 01, 2005
Filed:
Mar. 19, 2003
Shunsuke Kakisaka, Ibaraki, JP;
Kazuo Takeda, Sakai, JP;
Shunsuke Kakisaka, Ibaraki, JP;
Kazuo Takeda, Sakai, JP;
Matsushita Electric Industrial Co., Ltd., Osaka-fu, JP;
Abstract
A metal vapor discharge lamp has an arc tube in which mercury, a rare gas, and at least one luminous metal are enclosed, and an outer tube in which a nitrogen gas is enclosed and which covers the arc tube. The metal members which are provided in the outer tube and which include wiring for supplying power to the arc tube will not react with one of nitrogen and a nitrogen compound in the nitrogen gas atmosphere in the outer tube when the temperature exceeds 350° C. in a steady-state illumination. The use of a metal member such as stainless steel will increase the life of the discharge lamp.