Microporous membranes from poly(etheretherketone)-type polymers and low melting point crystallizable polymers, and a process for making the same
CA 2058182 C · Owner: Beck, H. Nelson · Inventors: Lundgard, Richard A.; Kawamoto, Jiro; Beck, H. Nelson
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for preparing a microporous membrane from an unsulfonated poly(etheretherketone)-type polymer by forming a mixture of an unsulfonated poly(etheretherketone)-type polymer a low melting point crystallizable polymer and a, plasticizer, heating the resulting mixture extruding or, casting the mixture into a membrane quenching or, coagulating the membrane and leaching the membrane, while optionally drawing the membrane before during, after leaching, or a combination thereof.
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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
- Filed December 20, 1991 and granted April 9, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2013.
- 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.