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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.:

US 10899692 B1

PDFFull Text
Date of Patent:
Jan. 26, 2021

Filed:

Oct. 26, 2018

Purification method and production method of difluoromethyl-1, 2, 2, 2-tetrafluoroethyl ether

Applicant:

Central Glass Company, Limited, Ube, JP;

Inventors:

Eri Nishizawa, Kawagoe, JP;

Shinya Akiba, Kawagoe, JP;

Assignee:

Central Glass Company, Limited, Ube, JP;

Attorney:

Crowell & Moring LLP

Primary Examiner:

Jafar F Parsa

Int. Cl.
CPC ...
C07C 41/38 (2006.01); C07C 41/44 (2006.01); C07C 43/12 (2006.01); C07C 41/22 (2006.01); C07C 45/63 (2006.01); C07C 41/01 (2006.01); B01J 27/24 (2006.01);
U.S. Cl.
CPC ...
C07C 41/38 (2013.01); C07C 41/01 (2013.01); C07C 41/22 (2013.01); C07C 41/44 (2013.01); C07C 43/123 (2013.01); C07C 45/63 (2013.01); B01J 27/24 (2013.01);
Abstract

A purification method of desflurane (difluoromethyl-1,2,2,2-tetrafluoroethyl ether of the formula (1)) includes bringing a mixture containing desflurane and a trihalomethane into contact with a base in the presence of a phase transfer catalyst, thereby decomposing the trihalomethane. By this method, only the trihalometane contained as a by-product in the desflurane is decomposed without causing decomposition of the desflurane, whereby the desflurane is obtained with high purity.

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Nishizawa, Eri. (2021). Purification method and production method of difluoromethyl-1, 2, 2, 2-tetrafluoroethyl ether (U.S. Patent No. 10899692). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/10899692

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