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. 01, 2025
Filed:
Mar. 19, 2020
Applicant:
Central Glass Company, Limited, Yamaguchi, JP;
Inventors:
Assignee:
CENTRAL GLASS COMPANY, LIMITED, Yamaguchi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01G 41/04 (2006.01);
U.S. Cl.
CPC ...
C01G 41/04 (2013.01);
Abstract
A tungsten hexafluoride manufacturing method of the present invention includes a reaction step of reacting tungsten with a gas of a fluorine element-containing compound so as to obtain a mixture that contains tungsten hexafluoride and hydrogen fluoride-containing impurities, and a discharge step of performing distillation of the mixture while performing a discharge operation at least two or more times during the distillation so as to obtain tungsten hexafluoride, the discharge operation being an operation in which a storage operation and a purge operation are alternately performed.