A polymeric pigment dispersant having an acrylic backbone, polyester side chains, cyclic imide groups and quaternary ammonium groups
CA 2337868 A1 · Owner: Sorser, Aleksandr · Inventors: Simms, John A.; Sorser, Aleksandr
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polymeric pigment dispersant of a graft polymer having an acrylic polymer backbone and pending from the backbone polyester side chains, cyclic imide , groups and quaternary ammonium groups and the polymer having a calculated number average molecular weight of 8,000-50,000; wherein the graft copolymer is composed of: (a)10-50 %, by weight of the graft polymer of an acrylic , copolymer backbone having a number average molecular weight of 2,500-10,000 which, before reaction, contains 25-75 % by weight of polymerized oxirane containing monomers; (b) 20-85 %, by weight of the graft polymer of a , polyester copolymer, or mixture of different polyester copolymers having a , number average …
Read the whole patent
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 September 1, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 1, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 1, 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.