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, 1993
Filed:
Sep. 23, 1992
Applicant:
Inventors:
Hideo Suzuki, Odawara, JP;
Etsuo Shimizu, Tokyo, JP;
Yujiro Suzuki, Odawara, JP;
Kitaro Shigeta, Fujisawa, JP;
Takashi Johnokuchi, Yokohama, JP;
Assignees:
Kasei Optonix, Ltd., Tokyo, JP;
Mitsubishi Kasei Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
2523015 ;
Abstract
A calcium tungstate phosphor which comprises calcium tungstate as a host and vanadium, wherein the proportion of the vanadium to the calcium tungstate is within a range of from 0.01 to 30 ppm. The phosphor is produced by forming a solid calcium tungstate precipitate from an aqueous medium containing ammonia, calcium ion, tungstate ion and vanadate ion and firing the precipitate in the presence of fluxing material.