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:
Feb. 05, 2008
Filed:
Apr. 14, 2003
Applicant:
Helmut Tiesler-wittig, Langerwehe, DE;
Inventor:
Helmut Tiesler-Wittig, Langerwehe, DE;
Assignee:
Koninklijke Philips Electronics, N.V., Eindhoven, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 61/35 (2006.01); H01J 61/40 (2006.01);
U.S. Cl.
CPC ...
Abstract
A gas-discharge lamp includes a discharge vessel, two electrodes, a cap, an outer envelope, and a filling of a metal halide. To improve the quality of the beam color, the outer envelope of the gas-discharge lamp is partially coated with an optical compensating filter of a color complementary to the color of the metal halide. By partially coating the outer envelope with the compensating filter, an unwanted coloration in the beam is corrected.