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. 07, 1999
Filed:
Jun. 25, 1998
Applicant:
Inventors:
Helmut Bechtel, Roetgen, DE;
Wolfram Czarnojan, Aachen, DE;
Walter Mayr, Wurselen, DE;
Thomas Justel, Aachen, DE;
Hans Nikol, Aachen, DE;
Cornelis Rhonda, Aachen, DE;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
428690 ; 428403 ; 313484 ; 313485 ; 313486 ; 313487 ; 313584 ; 313585 ; 313586 ; 313587 ; 2523 / ; 2523 / ;
Abstract
A plasma display device with a phosphor screen, comprising a phosphor composition of an UV-phosphor furnished with a coating which includes one or more catena-polyphosphates of metals of the group formed by the alkaline earth metals, zinc, cadmium and manganese, can effectively be used to counteract degradation of the phosphor by UV-excitation.