Method for using hydrophobically associative polymers in preparing cellulosic fiber compositions, and cellulosic fiber compositions incorporating the hydrophobically associative polymers
CA 2390353 A1 · Owner: Harrington, John C. · Inventors: Zhang, Huashi T.; Harrington, John C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A papermaking method and a composition which utilize as a drainage aid, a , water soluble hydrophobically associative polymer which is a copolymer prepared from monomers which include a hydrophobic ethylenically unsaturated monomer, and one or more of a nonionic ethylenically unsaturated monomer a , cationic ethylenically unsaturated monomer and an anionic ethylenically , unsaturated monomer.
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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 30, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 30, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 2022.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.