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. 26, 2016
Filed:
Jun. 30, 2011
Applicants:
Takafumi Yamazaki, Ageo, JP;
Yusuke Shiro, Ageo, JP;
Masao Sekiguchi, Ageo, JP;
Inventors:
Assignee:
Nihon Kessho Kogaku Co., Ltd., Tatebayashi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01D 3/02 (2006.01); G02B 1/02 (2006.01); C30B 11/00 (2006.01); C30B 29/12 (2006.01); C30B 33/02 (2006.01);
U.S. Cl.
CPC ...
G02B 1/02 (2013.01); C30B 11/00 (2013.01); C30B 29/12 (2013.01); C30B 33/02 (2013.01);
Abstract
A fluorite with excellent laser durability is provided by devising a heat-treatment method for CaFcrystal. A fluorite production method is proposed, wherein heat-treatment is carried out by providing, through compartment walls in the periphery of a fluorite crystal, a fluoride gas trap layer containing a fluoride gas-adsorbing material.