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:
Dec. 24, 1991
Filed:
Jul. 27, 1989
Applicant:
Inventors:
Rachel S Kohn, Springfield, NJ (US);
Sidney R Jones, Randolph, NJ (US);
Werner H Mueller, Corpus Christi, TX (US);
Assignee:
Hoechst Celanese Corp., Somerville, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; B01D / ;
U.S. Cl.
CPC ...
55 16 ; 55 68 ; 55158 ;
Abstract
An improved method of gas separation and novel polyimide membranes are disclosed and claimed. Membranes in accordance with the present invention include the condensation product of fluorinated diamines such as 2,2'-bis(3-aminophenyl)hexafluoropropane, 2,2'-bis(4-aminophenyl)hexafluoropropane and 2-(3-aminophenyl)-2'-(4-aminophenyl)hexafluoropropane with aromatic dianhydrides such as 3,3', 4,4' benzophenone tetracarboxylic acid dianhydride.
Kohn, Rachel. (1991). Method of gas separation and membranes therefor (U.S. Patent No. 5074891). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5074891
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile