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. 24, 1996
Filed:
Sep. 22, 1994
Applicant:
Inventors:
Michael Bredol, Aachen, DE;
Ulrich Kynast, Roetgen, DE;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ; C09K / ;
U.S. Cl.
CPC ...
25230165 ; 25230145 ;
Abstract
The invention relates to a luminescent zinc sulphide of cubic structure (sphalerite) which is so activated by aluminum and copper that a green-emitting luminescent material is created. In a simple manufacturing process, high x-values of the colour point and high luminous efficacy values are achieved in that copper is added in a quantity of 200 to 450 mole ppm and aluminum in a quantity of 700 to 2000 mole ppm.