Catalyst compositions for the preparation of polymers of carbon monoxide with olefinically unsaturated compounds
CA 2021067 A1 · Owner: Shell Canada Limited · Inventors: Keijsper, Johannes J.; Wong, Pui K.; Van Der Made, Alexander W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Catalyst compositions comprising a Group VIII metal and a tetrakisphosphine of the general formula (R1R2P)4R5, wherein R1 and R2 represent identical or different optionally polarly substituted hydrocarbyl groups and R5 represents a tetravalent organic group which connects the four phosphorus atoms and has such a structure that there are at least two carbon atoms between every two phosphorus atoms and a process, for the preparation of polymers of carbon monoxide with one or more olefinically unsaturated compounds using such a catalyst composition. CS7/T1369FF
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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 July 12, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 12, 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
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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.