Mixed-blocked polyisocyanates and uses thereof
CA 2434208 C · Owner: Bolton, Claire Louise · Inventors: Rimmer, Ian Kevin; Hargreaves, Peter; Bolton, Claire Louise
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mixed and hybrid blocked polyisocyanates as cross linking agents in coating compositions, having at least one 1,3-dicarbonyl blocking group and at least one thermally active blocking group such that the molar ratio of 1,3dicarbonyl blocking groups to thermally active blocking groups is in the range of from 4:1 to 1:9, offer improved intercoat adhesion when overcoated and good stability.
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 January 14, 2002 and granted November 1, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 14, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 14, 2024.
- 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.