Modified polymer and modified polymer membrane
CA 2337818 C · Owner: Kerres, Jochen · Inventors: Kerres, Jochen
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 method for producing nitrated and optionally sulphonated and aminated and optionally sulphonated aryl main chain polymers in addition to aryl main chain polymers thus modified. Aryl main chain polymers (e.g. (1)) are nitrated by dissolving them in expensive toxic and , environmentally damaging solvents. Aryl main chain polymers which are selectively and simultaneously nitrated and sulphonated were not previously known in literature. The inventive method makes it possible to produce lowcost nitrated (and optionally sulphonated (2)) or post-reduction aminated (and optionally sulphonated) aryl main chain polymers without any organic solvents. Nitration (and …
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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 March 26, 1999 and granted May 31, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 26, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2021.
- 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.