High molecular weight polyimidoylamidine and a polytriazine derived therefrom
CA 2015113 C · Owner: Aoshima, Atsushi · Inventors: Aoshima, Atsushi; Ikeda, Masanori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high molecular weight polyimidoylamidine having an intrinsic viscosity of from 0.12 dl/g to 0.60 dl/g and a high molecular weight polytriazine derived there-from having an intrinsic viscosity of from 0.15 dl/g to 0.65 dl/g are disclosed. A polyimidoylamidine having a wide distribution of molecular weights including high, molecular weights, can advantageously be obtained by reacting a hexafluoropropylene oxide oligomer dinitrile having a bifunctionality of at least 95 mole % with ammonia and reacting the resultant reaction product with a specific amount of a hexafluoropropylene oxide oligomer dinitrile. It has been found that a polyimidoylamidine having an intrinsic viscosity which is …
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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 February 1, 1990 and granted June 23, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 1, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 1, 2012.
- 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.