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:
Apr. 25, 2006
Filed:
Feb. 07, 2002
Applicants:
Hirohisa Kikuyama, Osaka-fu, JP;
Hirofumi Yazaki, Osaka-fu, JP;
Tomohiko Satonaga, Osaka-fu, JP;
Inventors:
Assignee:
Stella Chemifa Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B 7/07 (2006.01); C01B 9/08 (2006.01); C01B 23/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for reducing oxygen and carbon components in high-purity fluoride such as calcium fluoride and barium fluoride (a high-purity fluoride that is not limited to calcium fluoride and barium fluoride), or in rare-earth fluorides such as ytterbium fluoride and cerium fluoride used for an optical fiber, a coating material, and so on. The oxygen and carbon components contained in the high-purity fluoride are reduced by a fluorine gas treatment.