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. 09, 2003
Filed:
May. 03, 2001
Applicant:
Inventors:
Juergen Ruemmelin, Giengen, DE;
Reinhard Schaefer, Heidenheim, DE;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 5/16 ; H01J 6/140 ; H01J 1/716 ; H01K 1/26 ; G02B 5/28 ;
U.S. Cl.
CPC ...
H01J 5/16 ; H01J 6/140 ; H01J 1/716 ; H01K 1/26 ; G02B 5/28 ;
Abstract
The invention relates to an incandescent lamp whose lamp vessel ( ) has an interference filter ( ) with locally differing layer thickness for producing red light. The interference filter ( ) has a second absorber layer and additional layers of low optical refraction and high optical refraction for reducing its transmission in the violet, blue and green spectral regions.