Graft polymer with sidechains comprising nitrogen heterocycles
CA 2467308 C · Owner: Potthoff-Karl, Birgit · Inventors: Mueller, Christine; Baum, Pia; Potthoff-Karl, Birgit
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Graft polymers containing, (A) a polymeric grafting base devoid of monoethylenically unsaturated units, and, (B) polymeric side chains formed from copolymers of two different monoethylenically unsaturated monomers (B1) and (B2) which each contain at least one nitrogeneous heterocycle wherein said side chains (B) account for from 35 to 55% by weight of the total polymer.
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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 November 11, 2002 and granted January 24, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 11, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 11, 2024.
- 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.