N-acyl aminomethylene phosphonates and their use in waterborne coating compositions
CA 2199170 C · Owner: Ppg Industries Ohio, Inc. · Inventors: Maier, Douglas W.; Olson, Kurt G.; Poole, James E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
N-acyl aminomethylene phosphonates are provided having general formula (A) wherein R1 is hydrogen an aliphatic radical, having 1 to 25 carbon atoms or an aromatic radical having 6 to, 25 carbon atoms; R2 is hydrogen an aliphatic radical having 1 to, 25 carbon atoms or an aromatic radical having 6 to 25 carbons atoms; and R3 is a group remaining after reaction of a hydroxyl group-containing or epoxy group-containing polymer with an acidic hydrogen of a group (B). Also provided are waterborne coating compositions containing metallic pigments which are normally reactive with water or moisture to release hydrogen gas stabilized against gassing by incorporation of these N-acyl aminomethylene …
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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 August 18, 1995 and granted April 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 18, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 18, 2017.
- 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.