Functional group terminated polymers containing sulfonate group via sulfonation of ethylenically unsaturated polymers
CA 2222105 A1 · Owner: Witco Corporation · Inventors: Chang, Wally L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a process for producing, water-dispersible polymers particluarly condensation, polymers such as polyesters polyethers and, polyamindes, by forming an ethylenically unsaturated polymeric precursor by condensation polymerization of reactants including ethylenically unsaturated reactants and then sulfonating the ethylenic unsaturation of said polymeric precursor by reacting it with a sulfonating agent such as bisulfite metabisulfite, or a mixture thereof.
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 November 25, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 25, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 25, 2019.
- 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.