Blocked polyisocyanates
CA 2431822 C · Owner: Baumbach, Beate · Inventors: Fussel, Christian; Gurtler, Christoph; Schelhaas, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Blocked polyisocyanates, their preparation and use in one-component coating materials. In organic polyisocyanates having at least two isocyanate groups the , isocyanate groups are blocked with OH acidic cyclic ketones of the general formula (I), (see formula I), in which X represents an electron-withdrawing group R1 and R2 independently of one another represent the radicals H C1--C20-(cyclo)alkyl, C6-C24-aryl, C1-C20-(cyclo)alkyl ester or C1-C20-(cyclo)alkyl amide, C6-C24-aryl ester or C6-C24-aryl amide, mixed aliphatic/aromatic radicals having 1 to 24 carbon atoms, wherein R1 and R2 may also be part of a 4 to 8-membered ring, n is an integer from 0 to 5. The blocked polyisocyanate …
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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, 2003 and granted May 24, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 11, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 2025.
- 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.