Use of an ionic compound, derived from malononitrile as a photoinitiator, radical initiators or catalyser in polymerization processes or as a basic dye
CA 2805188 C · Owner: Hydro-Quebec · Inventors: Michot, Christophe; Armand, Michel; Choquette, Yves
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention concerns the use of ionic compounds derived from malononitrile as a photoinitiator source of an acid catalyst in a polymerization or reticulation process for monomers or prepolymers capable of reacting cationically or as a catalyst in a process for the modification of polymers. The invention also targets the use of ionic compounds derived from malononitrile in cationic dyes.
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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 December 30, 1997 and granted December 8, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 30, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 30, 2019.
- 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.