Process for preparing polyether ether ketone membrane
CA 2205301 C · Owner: Hachiya, Hiroshi · Inventors: Hachiya, Hiroshi; Shimoda, Teruyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a process for manufacturing a polyether ether ketone (PEEK) membrane which may be used for ultrafiltration or microfiltration at high temperatures. In this process for manufacturing a non-sulfonated PEEK membrane which comprises dissolving PEEK in a solvent to obtain a membrane forming stock solution, forming the stock solution into a desired shape and bringing the formed stock solution in contact with a coagulating liquid capable of coagulating PEEK the key features involve using concentrated sulfuric acid as the solvent, dissolving PEEK therein to prepare the stock solution and keeping the stock solution at 15 degrees C or lower until initiation of …
Read the whole patent
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 5, 1995 and granted July 25, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 5, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 5, 2017.
- 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.