Leather treatment with selected amphiphilic copolymers
CA 2003941 A1 · Owner: Stewart, Thomas · Inventors: El A'Mma, Anton Georges; Lesko, Patricia Marie; Stewart, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PATENT APPLICATION, of, PATRICIA MARIE THOMAS STEWART, and, ANTON GEORGES EL A'MMA for, LEATHER TREATMENT WITH SELECTED, AMPHIPHILIC COPOLYMERS DN 88-14 MSA:vjc, ABSTRACT OF DISCLOSURE: A method of improving the strength, temper and water resistance of leather utilizing selected amphiphilic copolymers is provided. The amphiphilic copolymers are formed from a predominant amount of at least one hydrophobic monomer and a minor amount of at least one copolymerizable hydrophilic monomer. The method is particularly useful as a one step substitute for conventional retanning and fatliquoring treatment steps. In a preferred embodiment the amphiphilic copolymers also provide a significant degree of …
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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 27, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 27, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.