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:
Feb. 19, 1991
Applicant:
Inventor:
Warren A Waite, Burlington, MA (US);
Assignee:
Ionics, Incorporated, Watertown, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; B01D / ;
U.S. Cl.
CPC ...
210644 ; 210654 ;
Abstract
A composite semipermeable membrane having improved chlorine tolerance, produced by employing the development of a thin film polymer layer by precipitation of the polymer at the interface of an aqueous (or organic) liquid layer; and an aqueous emulsion polymer layer at or near the surface of a semiporous support or substrate. No chemical reaction is involved.