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. 12, 2013
Filed:
Feb. 04, 2009
Tomonori Kanougi, Chiba, JP;
Harutoshi Hoshino, Chiba, JP;
Toshimune Yoshinaga, Chiba, JP;
Yoji Kase, Chiba, JP;
Kenji Fukunaga, Chiba, JP;
Tomonori Kanougi, Chiba, JP;
Harutoshi Hoshino, Chiba, JP;
Toshimune Yoshinaga, Chiba, JP;
Yoji Kase, Chiba, JP;
Kenji Fukunaga, Chiba, JP;
Ube Industries, Ltd., Yamaguchi, JP;
Abstract
Disclosed are a gas separation membrane and a gas separation method in which at least one species of organic vapor is separated and recovered from an organic vapor mixture using the gas separation membrane. The gas separation membrane is made of an aromatic polyimide composed of a tetracarboxylic acid component consisting of an aromatic ring-containing tetracarboxylic acid and a diamine component comprising 10 to 90 mol % of a combination of (B1) 3,4'-diaminodiphenyl ether and (B2) 4,4′-diaminodiphenyl ether at a B1 to B2 molar ratio, B1/B2, ranging from 10/1 to 1/10, and 10 to 90 mol % of other aromatic diamine.