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:
Aug. 07, 2007
Filed:
Mar. 24, 2005
Ta-wei Fu, Vienna, WV (US);
Steven H. Swearingen, Wilmington, DE (US);
Takuya Ichida, Settsu, JP;
Shigeyuki Yoshii, Settsu, JP;
Ta-Wei Fu, Vienna, WV (US);
Steven H. Swearingen, Wilmington, DE (US);
Takuya Ichida, Settsu, JP;
Shigeyuki Yoshii, Settsu, JP;
Daikin Industries, Ltd., Osaka, JP;
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A fluorocarboxylic acid preparation process which includes hydrolyzing fluorocarboxylic acid fluoride in the presence of an aqueous sulfuric acid solution to form a reaction product containing a fluorocarboxylic acid and hydrogen fluoride (present as hydrofluoric acid); and removing at least some of the hydrogen fluoride from the reaction product by washing the reaction production with aqueous sulfuric acid solution. The hydrolyzing and washing are carried out at a temperature at which the fluorocarboxylic acid is a liquid.