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:
Jan. 14, 1992
Filed:
Apr. 25, 1991
Applicant:
Inventor:
Timothy D Krizan, Wilmington, DE (US);
Assignees:
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
L'Air Liquide S.A., Paris, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
55158 ; 55 16 ; 521180 ; 521189 ; 528211 ; 528125 ; 528128 ; 528171 ; 528173 ; 528174 ; 528206 ; 528208 ; 528210 ;
Abstract
The disclosed invention is directed to polycyanoarylether membranes. These membranes are formed by reacting an aromatic diol with a dihalobenzonitrile or dinitrobenzonitrile in the presence of a base and a polar, aprotic solvent. These membranes can be provided as either homopolymers or copolymers.