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:
Apr. 29, 1997
Filed:
Nov. 29, 1994
Applicant:
Inventors:
Rita Tiedt, Berlin, DE;
Helmut Weske, Berlin, DE;
Koichiro Maekawa, Ichinomiya, JP;
Junichi Doi, Aichi, JP;
Assignees:
Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen mbH, Munich, DE;
NGK Insulators, Ltd., Nagoya, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C04B / ; H01J / ;
U.S. Cl.
CPC ...
313636 ; 313493 ; 501153 ; 501127 ; 501119 ;
Abstract
A ceramic discharge vessel (6) for a high-pressure discharge lamp (1) made from a sintered body of optically translucent polycrystalline alumina ceramic which is doped with only 100-800 ppm MgO, only 200-1200 ppm ZrO.sub.2 and only 10-300 ppm Y.sub.2 O.sub.3 (by weight). This improves the loading capacity and operating characteristics of the vessel and of the lamp.