Microporous polyester membranes and polymer assisted phase inversion process for making same
CA 1062412 A · Owner: Gelman Sciences Inc. · Inventors: Kesting, Robert E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polymer assisted phase inversion process for producing membranes is disclosed which includes forming a casting solution of a solvent resistant polymer and an assisting polymer both dissolved in a mutal solvent. The mutal solvent is extracted from the membrane which is then exposed to a solvent for the assisting polymer which is a non-solvent for the solvent resistant polymer. A preferred solvent resistant polymer is a polyester resin of the general formula, Wherein a is an integer of at least 3 and not greater than 7, and n is an integer greater than about 45.
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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 18, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 18, 1996.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.