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:
Mar. 25, 2014
Filed:
Sep. 02, 2009
Hiroyuki Sakaguchi, Fuchu, JP;
Hideaki Kobayashi, Fuchu, JP;
Yoshihisa Misawa, Akaiwa, JP;
Keisuke Uryu, Akaiwa, JP;
Yoshio Shimizu, Akaiwa, JP;
Hiroyuki Sakaguchi, Fuchu, JP;
Hideaki Kobayashi, Fuchu, JP;
Yoshihisa Misawa, Akaiwa, JP;
Keisuke Uryu, Akaiwa, JP;
Yoshio Shimizu, Akaiwa, JP;
Q.P. Corporation, Tokyo, JP;
Bizen Chemical Co., Ltd., Okayama, JP;
Abstract
A method of obtaining a polyunsaturated fatty acid derivative comprises contacting a mixture of fatty acid derivatives with a silver salt aqueous solution, and adjusting the free fatty acid content in the silver salt aqueous solution to 0.2 meq or less per gram of silver when repeatedly using the silver salt aqueous solution. A polyunsaturated fatty acid derivative having high purity and excellent quality can thus be economically obtained.