Crystalline aromatic polyketone and process for producing the same
CA 1260187 A · Owner: Asahi Kasei Kogyo Kabushiki Kaisha · Inventors: Sakurai, Hisaya; Fukawa, Isaburo; Yoneda, Haruyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Crystalline aromatic polyketones having a linear polymer structure comprising repeating units I repeating units II of , said repeating units I and II being bonded alternately and said polymer having an intrinsic viscosity of 0.4 or more, are excellent in various properties particularly, in heat resistance, and can be used as shaped articles coatings, films, fibers, etc.
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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 26, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 26, 2006.
- 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
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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.