Preparation of polymers of carbon monoxide with olefinically unsaturated compounds
CA 2045065 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
Polymers of carbon monoxide with one or more monomers comprising a group of the formula which is linked by a hydrocarbylene bridge to a monovalent oxygen-containing group, and optionally additionally with one or more monomers of the formula can be prepared using a catalyst composition based upon a Group VIII metal and a phosphorus bidentate ligand of formula (R5R6P)2R, in which formulae R1 and R2 represent hydrogen atoms and/or hydrocarbyl groups, R is a bivalent organic bridging group which contains at least two carbon atoms in the bridge linking the two phosphorus atoms to each other and R5 and R6 represent identical or different optionally polar-substituted aliphatic hydrocarbyl groups. …
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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 20, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 20, 2013.
- 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.