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:
May. 29, 1990
Filed:
Aug. 09, 1989
Applicant:
Inventor:
Bernd A Koenitzer, Clearwater, CA;
Assignee:
Exxon Research and Engineering Company, Florham Park, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
210640 ; 210644 ; 210651 ; 21050039 ;
Abstract
Aromatics are separated from non-aromatics by permeation of the aromatic through a polyurethane-imide membrane. Permeation is conducted under pervaporation, perstraction, reverse osmosis, or dialysis conditions. The membrane is a polyurethane-imide membrane made using polyurethane-imide copolymers which are made by end capping a polyol with a polyisocyanate and then chain extending by reaction with an anhydride.