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:
Sep. 30, 2025
Filed:
Aug. 02, 2021
Nitto Denko Corporation, Ibaraki, JP;
NITTO DENKO CORPORATION, Ibaraki, JP;
Abstract
The present invention provides a separation membrane suitable for separating water from a liquid mixture containing an alcohol and water, the separation membrane being capable of reducing a decrease in separation performance regardless of long-term use. A separation membraneof the present invention includes a polyimide having a structural unit X represented by the following formula (1) and a structural unit Y represented by following formula (2). Ais a linking group including no arylene group in a main chain and having a solubility parameter, in accordance with a Fedors method, of more than 5.0 (cal/cm). Ais a tetravalent organic group including an arylene group.