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. 03, 2007
Filed:
Jan. 19, 2004
Kiyoshi Takahashi, Kyoto, JP;
Makoto Horiuchi, Nara, JP;
Tsuyoshi Ichibakase, Osaka, JP;
Shinichiro Hataoka, Osaka, JP;
Tomoyuki Seki, Osaka, JP;
Takashi Tsutatani, Shiga, JP;
Kiyoshi Takahashi, Kyoto, JP;
Makoto Horiuchi, Nara, JP;
Tsuyoshi Ichibakase, Osaka, JP;
Shinichiro Hataoka, Osaka, JP;
Tomoyuki Seki, Osaka, JP;
Takashi Tsutatani, Shiga, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A method for manufacturing a high-pressure discharge lamp includes a process step in which a sealing portion is formed out of a side tube portion of a glass pipe that is designed for use in a discharge lamp. In the step of forming the sealing portion, a compound glass tube, which is composed of an outer tube made of a first glass and an inner tube made of a second glass whose softening point is lower than that of the first glass, is inserted into the side tube portion, which is also formed of the first glass. The side tube portion is then heated so that the side tube portion is brought in tight contact with the compound glass tube. Thereafter, at least the sealing portion is heated at a temperature higher than the strain point temperature of the second glass portion.