Anionic polymers
CA 2414341 A1 · Owner: Cognis Iberia S.L. · Inventors: Tuduri, Jaime; Pi Subirana, Rafael; Valls, Ramon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to anionic polymers obtainable by (a) esterifying maleic acid or its anhydride with alkyl polyalkylene glycols, (b) copolymerising the esters obtained with (meth)acrylic acid and (c) converting the polymers obtained into the salt form by addition of alkali metal bases.
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 December 16, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 16, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 16, 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.