Polyester coating compositions containing 2-methyl-1,3-propanediol
CA 2016124 C · Owner: Sullivan, Carl J. · Inventors: Sullivan, Carl J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel linear polyesters suitable for the preparation of thermoset coatings having improved flexibility and hardness are disclosed. The linear polyesters, comprised of recurring units of 2-methyl-1,3-propanediol and at least one cyclic dicarboxylic acid moiety, are used in thermosettable resin compositions additionally containing an aminoplast cross-linking agent and a catalyst. Pigment and solvent may optionally also be present in such compositions.
Read the whole patent
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 May 4, 1990 and granted July 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 4, 2012.
- 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.