Substituted aliphatic polyamide porous membranes
CA 1288560 C · Owner: Memtec Limited · Inventors: Ford, Douglas Lyons
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polymeric porous membranes comprising aliphatic polyamide membrane matrices having both relatively non-crystalline and relatively crystalline portions are described. The method of preparing the porous membranes includes dissolution of an aliphatic thermoplastic polyamide (having crystalline and non-crystalline portions) into an acidic hydrolytic solvent such that the crystalline portions form a colloidal dispersion which is further formed into a film. The non-crystalline portions are precipitated in the film to form a porous membrane matrix which is reacted with an acid halide of basicity above one to provide acid radicals within the membrane. The acid halide may be derived from an aromatic …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted September 10, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 10, 2008.
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Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.