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:
May. 08, 2012
Filed:
Jan. 22, 2010
Applicants:
Michio Takagaki, Shizuoka, JP;
Akira Homma, Shizuoka, JP;
Takeshi Fukuyo, Shizuoka, JP;
Inventors:
Assignee:
Koito Manufacturing Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 61/22 (2006.01); H01J 61/20 (2006.01);
U.S. Cl.
CPC ...
Abstract
A mercury-free arc tube for a discharge lamp unit including a closed glass bulb in which main light emitting substances of NaI, ScI, and ScBrand buffer substances of InI and ZnIare enclosed together with Xe gas, and wherein an amount of enclosed ScBris in a range of about 5 wt % to about 24 wt % relative to a total weight of the substances enclosed in the closed glass bulb. The mercury-free arc tube may also include a shroud glass tube, which is surrounds the closed glass bulb and a pair of electrodes, which are disposed to be opposed to each other in the closed glass bulb.