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:
Oct. 19, 1999
Filed:
Mar. 31, 1998
Applicant:
Inventor:
Masatoshi Maeda, Osaka, JP;
Assignee:
Nitto Denko Corporation, Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528353 ; 528 26 ; 528125 ; 528128 ; 528171 ; 528172 ; 528173 ; 528174 ; 528175 ; 528183 ; 528188 ; 528220 ; 528224 ; 528229 ; 528350 ; 96-4 ; 96-8 ; 96 13 ; 96 14 ; 95 43 ; 95 45 ; 4284735 ;
Abstract
A novel polyimide having a repeating structure unit expressed by the following general formula (1), a method for manufacturing the same, a gas separation membrane using the novel polyimide and the method for manufacturing the same. The gas separation membrane using this polyimide is excellent in gas permeable performance and separation selectivity for gas, for example, carbon dioxide, methane, etc. General Formula (1) ##STR1## where R denotes a quadrivalent organic group.