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:
Oct. 06, 1992
Filed:
Sep. 14, 1990
Applicant:
Inventor:
Russell B Hodgdon, Concord, MA (US);
Assignee:
Ionics, Incorporated, Watertown, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
210654 ; 210490 ; 21050037 ; 21050038 ;
Abstract
A thin film composite (TPC) ultrafilter/hyperfilter water softening membrane on a microporous substrate is produced by an interfacial polymerization reaction between (1) an aqueous phase comprising a blend of water soluble and water dispersible compounds, the former containing piperazine and polyamines, the latter using a chlorine or other oxidant reacting compound which protects the resulting membrane from damage by any chlorine present and (2) an organic phase comprising polyfunctional agents capable of reacting and/or polmerizing with one or more of the ingredients of said aqueous phase.