A process for the preparation of a copolymer of carbon monoxide
CA 2199220 A1 · Owner: Wijngaarden, Rudolf · Inventors: Van Der Veer, Frits; Wijngaarden, Rudolf; Drent, Eit
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the copolymerization of carbon monoxide with ethene and optionally another olefinically unsaturated compound in which process the monomers are copolymerized in the presence of a liquid diluent and a catalyst composition which is based on (a) a Group VIII metal compound, (b) an anion of an acid which is obtainable by combining a Br~nsted acid with a Lewis acid, and (c) an organic oxidant in a quantity of less than 30 moles per mole of Group VIII metal.
Read the whole patent
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 March 5, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 5, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 5, 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.