A process for the preparation of copolymers
CA 2198568 A1 · Owner: Van Broekhoven, Johannes Adrianus Maria · Inventors: Van Broekhoven, Johannes Adrianus Maria
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of a copolymer of carbon monoxide with an olefinically unsaturated compound, which process comprises suspending a copolymer of carbon monoxide with an olefinically unsaturated compound in a liquid diluent in which the copolymer to be prepared forms a suspension and subsequently contacting the monomers in the suspension so obtained with a catalyst composition which is soluble in the diluent and which is based on a Group VIII metal and a bidentate ligand of the general formula, R5R6M1-R-M2R7R8 wherein M1 and M2 independently, represent a phosphorus nitrogen, arsenic or antimony, atom, R5 R6, R7 and R8 independently represent an optionally polar substituted …
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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 February 26, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 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
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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.