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:
Jul. 16, 1985
Filed:
Jun. 20, 1983
Applicant:
Inventors:
Assignee:
Nitto Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528423 ; 2105002 ; 528 27 ; 528172 ; 528208 ; 528210 ; 528211 ; 528229 ; 528321 ; 528327 ; 528331 ; 528337 ; 528341 ; 528391 ;
Abstract
A selective permeable membrane comprising a polyquinazolone-based polymer including a repeating unit represented by the formula ##STR1## wherein R.sup.1 is a tetravalent aromatic group, R.sup.2a and R.sup.2b are each independently, an alkyl group or aromatic group, and R.sup.3 is a divalent organic group.