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:
Oct. 08, 2002
Filed:
Dec. 03, 1999
Ushiodenki Kabushiki Kaisha, Tokyo, JP;
Abstract
A super-high pressure mercury lamp with an internal pressure during operation of one hundred and some dozen atm, which has a new arrangement in which in the hermetically sealed portions neither damage the lamp nor shortening its operating service life is achieved, in a high pressure mercury lamp in which a silica glass discharge vessel contains a pair of spaced apart, opposed electrodes and which is filled with a rare gas and with mercury in an amount of greater than or equal to 0.16 mg/mm , and in which the wall load is greater than or equal to 0.8 W/mm , is achieved in that a side tube part formed on each end of this discharge vessel is provided with a sealing body that is made of a functional gradient material which is formed essentially of a dielectric material and an electrically conductive material with a ratio to one another which changes in the lengthwise direction of the sealing body, between a dielectric end area and an electrically conductive end area, the dielectric end area being connected to the side tube and the electrically conductive end area being connected to an outer electric lead.