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. 18, 1976
Filed:
Apr. 30, 1975
Applicant:
Inventor:
Robert E Kesting, Irvine, CA (US);
Assignee:
Chemical Systems Incorporated, Santa Ana, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; B29D / ;
U.S. Cl.
CPC ...
210490 ; 2105 / ; 210 / ; 260 / ; 260 / ; 260 / ; 260 / ; 260 / ; 264 41 ; 264 13 ; 264 464 ; 264 49 ;
Abstract
Microporous membrane filters composed of polyesters derived from aromatic dibasic acids and especially polytetramethylene terephthalate are produced. These membranes are produced by a polymer assisted phase inversion process involving casting a solution of the polyester and assisting polymer to form a film, evaporating the solvent to form a membrane having inchoate micropores filled with the assisting polymer and subsequently at least partially leaching out the assiting polymer.