Preparation of polymers
CA 2055016 A1 · Owner: Wijngaarden, Rudolf J. · Inventors: Wijngaarden, Rudolf J.; Van Broekhoven, Johannes A. M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of linear polymers of carbon monoxide with one or more olefinically unsaturated compounds in, which polymers the units originating from carbon monoxide and the units originating from the olefinically unsaturated compounds occur in a substantially alternating order, comprising contacting the monomers at elevated temperature and pressure with a solution of a suitable catalyst, in the presence of a liquid non-polymerizable, diluent at least consisting of one or more lower aliphatic alcohols and water. Such polymers having an alcohol content below 4000 ppmw, are novel compounds. D10/T1599FF
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 November 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 6, 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.