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. 08, 2000
Filed:
Feb. 26, 1999
Applicant:
Inventor:
Perry Niel Yocom, Princeton, NJ (US);
Assignee:
Sarnoff Corporation, Princeton, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ; C09K / ; C09K / ;
U.S. Cl.
CPC ...
2523 / ; 2523 / ;
Abstract
Long persistence red phosphors of alkaline earth metal phosphates, alkaline earth magnesium silicates and alkaline earth magnesium di-silicates are doubly activated with europium and manganese and contain a trivalent or quadrivalent thermal trapping agent. The thermal trapping cation feeds thermal energy to the europium ion which in turn feeds the energy to the manganese ion that emits in the red region of the spectrum.