Waterborne acrylourethane pigment dispersant polymer
CA 2109964 C · Owner: Prottas, Robert D. · Inventors: Prottas, Robert D.; Johnson, Jefferey W.; Strolle, Clifford H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved waterbased coating composition containing about 10-50 % by weight of film forming binder and pigment in a pigment to binder weight ratio of about 1/100 to 200/100 dispersed in an aqueous carrier and having a pH of about 7-10; wherein the improvement used in the composition is an acrylourethane pigment dispersing polymer in an amount of about 0.5-10 % by weight, based on the weight of the coating composition; the acrylourethane pigment dispersing polymer is composed of hydroxyl and carboxyl functional acrylic polyol having a hydroxyl number of about 50- 170 and an acid number of about 30-120 and chain extended with an aliphatic, cycloaliphatic or aromatic diisocyanate in the …
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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 June 11, 1991 and granted August 21, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 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.