Polyacrylic acid compositions for textile processing
CA 2094820 C · Owner: Sargent, Ralph R. · Inventors: Williams, Michael S.; Sargent, Ralph R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel polyacrylic acid resins are prepared by polymerizing H2C=CHCO2H H2C=CRCO2X, or HRC=CHCO2X, wherein R is an aliphatic or aromatic hydrocarbon halogenated hydrocarbon, or sulfonated hydrocarbon of from C1 to C20 phenol, naphthol, sulfonated phenol, sulfonated naphthol or a halogen, and X is hydrogen, alkyl or a hydroxylated, ethoxylated, sulfonated or halogenated aliphatic or aromatic hydrocarbon of from C1 to C20 sodium, potassium, ammonium, or, quaternary amine in the presence of aromatic sulfonic acid or its salt to form a polymer in which the sulfonated aromatic compound is covalently bound to the polymer. In an alternative embodiment a textile processing or cleansing compound is …
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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 October 18, 1991 and granted December 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 18, 2013.
- 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.