Catalyst compositions suitable for the preparation of polymers of carbon monoxide and -olefins
CA 2075245 A1 · Owner: Shell Canada Limited · Inventors: Drent, Eit
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A C T, CATALYST COMPOSITIONS SUITABLE FOR THE PREPARATION OF POLYMERS OF CARBON MONOXIDE AND .alpha.-OLEFINS Catalyst compositions based upon:, a) a Group VIII metal b) an acid with a pKa of less than 2 in a quantity of more than 5 mol per gram atom Group VIII metal, and c) a phosphorus bidentate ligand of the general formula R5R6P-R-PR7R8 in which R5 to R8 represent identical or different, optionally polar substituted hydrocarbyl groups containing a carbon atom which carbon atom carries at most one hydrogen atom and is linked to the corresponding phosphorus atom via a methylene bridge, and in which R is a divalent organic bridging group containing at least two carbon atoms in the bridge …
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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 August 4, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 4, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 4, 2014.
- 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.