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:
Sep. 23, 2003
Filed:
Jul. 20, 2001
Applicant:
Inventors:
Richard G. W. Gingerich, Towanda, PA (US);
Clarence D. Vanderpool, Towanda, PA (US);
Assignee:
Osram Sylvania Inc., Danvers, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B05D 3/02 ; B05D 5/06 ; C09K 1/156 ; C09K 1/184 ;
U.S. Cl.
CPC ...
B05D 3/02 ; B05D 5/06 ; C09K 1/156 ; C09K 1/184 ;
Abstract
A method of increasing the color-stability of an electroluminescent phosphor which comprises the steps of forming the phosphor and then firing the formed phosphor in a vacuum in the presence of a material selected from the group of Eu, Ce, and Sm for a time sufficient to provide said increase in color-stability.