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. 30, 2004
Filed:
Jun. 04, 2002
Applicant:
Inventors:
Yukihiro Kobayakawa, Shizuoka, JP;
Masaya Shido, Shizuoka, JP;
Assignee:
Koito Manufacturing Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 1/716 ; C03C 3/06 ;
U.S. Cl.
CPC ...
H01J 1/716 ; C03C 3/06 ;
Abstract
A discharge bulb comprising an arc tube body having such a structure that a shroud glass having metal oxide (Al O , CeO ) added thereto is attached integrally to surround an arc tube sealing Hg, NaI, ScI and Xe gases. A total amount of addition of the metal oxide in the shroud glass is set to be 4000 ppm or more which is effective for fulfilling an electrostatic shielding function for an external electric field and less than 7000 ppm which can hold the excellent molding property of the shroud glass.