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. 08, 1995
Filed:
Jun. 10, 1991
Applicant:
Inventors:
Kazuhiko Hirosawa, Ube, JP;
Yasuhiro Kurokawa, Ube, JP;
Tomohiko Yamamoto, Ube, JP;
Masaru Matsunishi, Ube, JP;
Yoshihiro Nawata, Ube, JP;
Assignee:
Ube Industries, Ltd., Yamaguchi, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
540540 ; 540464 ; 540451 ; 540535 ;
Abstract
Disclosed is a method for purifying a lactam-containing organic solution which comprises processing an organic solution containing at least one lactam with an anion exchange resin to remove an anionic surface active substance contained in said organic solution, and then extracting with water to separate an objective component contained in the organic solution to an aqueous solution.