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:
Jun. 22, 2010
Filed:
Oct. 24, 2006
Applicants:
Hiroyuki Yatsuyanagi, Yurihonjo, JP;
Hiroshi Koshiyama, Akita, JP;
Tsunetoshi Honda, Akita, JP;
Inventors:
Assignees:
Mitsubishi Materials Corporation, Tokyo, JP;
Jemco Inc., Akita-Ken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 303/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
This method for producing trifluoromethanesulfonic anhydride reacting trifluoromethanesulfonic acid with phosphorus pentoxide to produce trifluoromethanesulfonic anhydride, wherein hardening of the reaction solution due to polyphosphoric acid, which is produced as a byproduct, is prevented by using an excess amount of trifluoromethanesulfonic acid with respect to the phosphorus pentoxide.