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:
May. 27, 2008
Filed:
Aug. 03, 2004
Milan Hubacek, Kanagawa-ken, JP;
Kenji Takahashi, Kanagawa-ken, JP;
Milan Hubacek, Kanagawa-ken, JP;
Kenji Takahashi, Kanagawa-ken, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
A mixed melt, which contains urea and/or a urea derivative and contains a metal compound, is prepared. The mixed melt is solidified, by heating, whereby the urea and/or urea derivative is decomposed, a precursor being thereby prepared. The thus prepared precursor is ground, and then the thus ground precursor is fired. The metal of the metal compound may be at least one kind of a metal selected from the group consisting of Al, B, Ba, Be, Bi, Ca, Cd, Cs, Ga, Ge, Hf, In, K, Li, Mg, Mo, Na, Nb, P, Rb, Si, Sn, Sr, Ta, Ti, V, W, Zr, and rare earth metals. A finely powdered phosphor free from inclusion of impurities and having uniform particle size is thus produced at a low cost and efficiently.