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:
Mar. 03, 1998
Filed:
Apr. 12, 1996
Applicant:
Inventors:
Assignee:
Futaba Denshi Kogyo K.K., Chiba-ken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
428570 ; 428629 ; 428639 ; 2523 / ;
Abstract
A phosphorescent material has an excellent life time characteristic when it is applied to display device such as a fluorescent display device and includes a body portion composed of alkali metal and an oxide, and a protective coat formed over a surface of the body portion. The protective coat is composed of an oxide containing at least one element selected from the group consisting of Al, Ti, Si, Zn, Sn, Bi, Sb, Ce, Y, Ta, Gd, Ru and Ga.