Heat-resistant film and composite ion-exchange membrane
CA 2503433 A1 · Owner: Yamada, Jun · Inventors: Inukai, Cyuji; Sakaguchi, Yoshimitsu; Kawahara, Keizo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heat-resistant film comprising at least any one of a polybenzazole aramid, and polyamide-imide, which is produced by sandwiching a polymer solution between at least two supports, forming the solution into a thin film by means of rolls, a slit, or a press, introducing the film to a coagulating bath and , removing the supports in the coagulating bath to coagulate the film; and a composite ion-exchange membrane comprising a composite layer comprising the film impregnated with an ion-exchange resin and formed on each side of the , composite layer a surface layer which comprises an ion-exchange resin and includes no porous film. The heat-resistant film is excellent in all of heat …
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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 October 23, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 23, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2025.
- 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.