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:
Apr. 28, 2015
Filed:
Mar. 30, 2011
Izumi Morita, Kamakura, JP;
Masateru Ito, Kamakura, JP;
Hideki Sawai, Kamakura, JP;
Shinichi Minegishi, Urayasu, JP;
Katsushige Yamada, Kamakura, JP;
Kenji Kawamura, Kamakura, JP;
Shinichi Yamane, Tokyo, JP;
Izumi Morita, Kamakura, JP;
Masateru Ito, Kamakura, JP;
Hideki Sawai, Kamakura, JP;
Shinichi Minegishi, Urayasu, JP;
Katsushige Yamada, Kamakura, JP;
Kenji Kawamura, Kamakura, JP;
Shinichi Yamane, Tokyo, JP;
Toray Industries, Inc., Tokyo, JP;
Abstract
A method for producing a diol or triol, which has a step of removing impurities contained in a diol- or triol-containing solution, is provided. In the method, a diol- or triol-containing solution is filtered through a nanofiltration membrane having a polyamide-containing functional layer. The diol- or triol-containing solution is then collected from the permeate flow of the nanofiltration membrane.