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:
Dec. 30, 2003
Filed:
Mar. 26, 2003
Applicant:
Inventor:
Kazuhisa Nishida, Tokyo, JP;
Assignee:
NEC Microwave Tube, Ltd., Sagamihara, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 1/720 ; H01J 6/120 ; H01J 9/00 ; H01J 9/38 ;
U.S. Cl.
CPC ...
H01J 1/720 ; H01J 6/120 ; H01J 9/00 ; H01J 9/38 ;
Abstract
A high pressure discharge lamp includes a quartz glass bulb having a sealing portion; and a pair of electrodes. Each electrode of the pair of electrodes is disposed so as to be opposite the other in the quartz glass bulb. The quartz glass bulb of the high pressure discharge lamp contains at least mercury and a halogen gas. The partial pressure of oxygen (O) in the quartz glass bulb is about 2.5×10 Pa or less and the partial pressure of the halogen gas in the quartz glass bulb is in the range between about 1×10 &mgr;mol/mm and 1×10 &mgr;mol/mm .