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:
Nov. 11, 2014
Filed:
Apr. 14, 2011
Toru Inagaki, Ube, JP;
Masato Yamauchi, Ube, JP;
Seiji Noguchi, Ube, JP;
Kouichi Fukuda, Ube, JP;
Akira Ueki, Ube, JP;
Toru Inagaki, Ube, JP;
Masato Yamauchi, Ube, JP;
Seiji Noguchi, Ube, JP;
Kouichi Fukuda, Ube, JP;
Akira Ueki, Ube, JP;
Ube Material Industries, Ltd., Ube-shi, Yamaguchi, JP;
Abstract
A blue light-emitting silicate phosphor favorably employable as a blue light-emitting source of a light-emitting apparatus which gives emission of a visible light upon irradiation of ultraviolet rays having a wavelength of 254 nm, such as ultraviolet rays emitted by a fluorescent lamp is produced by a method comprising calcining a powdery mixture comprising a magnesium oxide powder, an MeO source powder, a EuO source powder and a SiOsource powder, said magnesium oxide powder having a purity of 99.9 wt. % or higher and a BET specific surface area in the range of 3 to 60 m/g and having been prepared by bringing a metallic magnesium vapor into contact with oxygen whereby oxidizing the metallic magnesium vapor.