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:
Sep. 23, 1997
Filed:
Jun. 21, 1995
Yukio Yasudaa, Himeji, JP;
Kiyotada Nakamura, Himeji, JP;
Ushiodenki Kabushiki Kaisha, Chiyoda-ku, JP;
Abstract
A good discharge lamp which can emit light with wavelengths in the range of 220 nm in an amount sufficient for industrial applications and at the same time can adequately maintain a transmission factor of the radiant light and emits neither water nor hydrogen or the like during luminous operation is achieved by the fact that, in a discharge lamp in which a pair of electrodes are located adjacent to one another encapsulated within a quartz glass fluorescent tube together with mercury and an inert gas, the quartz glass contains an OH radical concentration of a weight of in the range of 300 to 800 ppm. Furthermore, the content of metallic impurities in the quartz glass is limited to a weight less than or equal to 1 ppm.