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:
Aug. 04, 1992
Filed:
Feb. 07, 1990
Applicant:
Inventors:
Hiromichi Kawashima, Kawasaki, JP;
Kazuo Honda, Hiratsuka, JP;
Youichiro Mitsuyuki, Tokyo, JP;
Yasuki Mori, Yokohama, JP;
Masakazu Shibuya, Yokosuka, JP;
Mamoru Furuya, Miura, JP;
Assignee:
Toshiba Lighting & Technology Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ;
U.S. Cl.
CPC ...
313641 ; 313639 ; 313640 ; 313642 ;
Abstract
A prescribed amount of tin halide is sealed in the arc tube of a metal halide lamp wherein a given amount of metal halide including a target amount of halogen and at least a predetermined amount of rare earth metal is sealed in the arc tube thereof to maintain a high lumen maintenance factor for an extended operation period. The prescribed amount of tin halide is preferably within 4.6.about.234 mol % of the predetermined amount of rare earth metal.