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:
Nov. 01, 2011
Filed:
Nov. 24, 2008
Toshiaki Tsuda, Shizuoka, JP;
Yukihiro Onoda, Shizuoka, JP;
Toshiaki Tsuda, Shizuoka, JP;
Yukihiro Onoda, Shizuoka, JP;
Koito Manufacturing Co., Ltd., Tokyo, JP;
Abstract
An electric discharge lamp has a ceramic luminous tubeand filled with xenon gas, a pair of electrodesheld by the ceramic luminous tube, and a glass outer tubeaccommodating the ceramic luminous tube and the pair of electrodes. The ceramic luminous tube includes a luminous portionemitting light by electric discharge, and a pair of small diameter tube portionsrespectively connected to both end portions of the luminous portion in a longitudinal direction. Value of P/(r•t) is not less than 4.8 and not more than 32, where P (atm) is pressure of xenon gas filled into the ceramic luminous tube, r (mm) is an inner diameter of the luminous portion of the ceramic luminous tube, and t (mm) is thickness of the luminous portion of the ceramic luminous tube.