Alkali-swellable associative polymers, methods and compositions
CA 2473241 A1 · Owner: Lubrizol Advanced Materials, Inc. · Inventors: Tamareselvy, Krishnan; Shah, Pravinchandra K.; Ramey, Kittie L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are multi-purpose alkali-swellable and alkali soluble associative polymers, which are the polymerization product of a monomer mixture comprising: (a) at least one acidic vinyl monomer; (b) at least one nonionic vinyl monomer; (c) a first associative monomer having a first hydrophobic end group; (d) a monomer selected from the group consisting of a second associative monomer having a second hydrophobic end a semihydrophobic monomer , and a combination thereof; and optionally, (e) one or more crosslinking monomers or chain transfer agents. When monomer (d) is an associative monomer the first and second hydrophobic end groups of monomers (c) and (d) have significantly …
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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 January 14, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 14, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 14, 2025.
- 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.