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:
Aug. 20, 1991
Filed:
Mar. 30, 1990
Applicant:
Inventors:
Cornelis Huiskes, Roosendaal, NL;
Roelof Brinkman, Maarheeze, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313487 ; 313489 ;
Abstract
Low-pressure mercury vapor discharge lamp in which the envelope (1) is provided on its inside with a luminescent layer (5), which comprises green luminescing Zn.sub.2 SiO.sub.4 :Mn.sup.2+ (willemite), while between the luminescent layer (5) and the envelope (1) a luminescent intermediate layer (6) is present, which comprises luminescent Sr.sub.4 Al.sub.14 O.sub.24 : Eu.sup.2+, in which the Sr may be replaced for up to 25 mol. % by Ca.