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. 09, 2008
Filed:
Nov. 05, 2004
Applicants:
Yoneichi Hirata, Tokyo, JP;
Tomoya Sakaguchi, Tokyo, JP;
Nobuyoshi Takeuchi, Tokyo, JP;
Inventors:
Assignee:
Nemoto & Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C09K 11/55 (2006.01);
U.S. Cl.
CPC ...
Abstract
A phosphorescent phosphor having excellent afterglow luminance characteristics, even under low illumination intensity of radiation conditions, compared to conventional strontium aluminate phosphorescent phosphors of the same type, and particularly a phosphorescent phosphor having excellent initial afterglow luminance characteristics and excellent afterglow luminance characteristics at 60 and 90 minutes after cessation of the excitation, with following requirements:0.015<Eu/(Sr+Ba+Eu+Dy)≦0.05, 0.3≦Dy/Eu≦2,0.03≦Ba/(Sr+Ba)≦0.2 and 2.1≦Al/(Sr+Ba+Eu+Dy)≦2.9.