Process for the preparation of polymers
CA 1338579 C · Owner: Shell Canada Limited · Inventors: Drent, Eit; Van Doorn, Johannes Adrianus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polymers of carbon monoxide and one or more olefinically unsaturated compounds are prepared by contacting with a catalyst composition comprising a Group VIII metal and a compound of the general formula R1M1-R-M2R2 wherein M1 and M2 are chosen from sulphur selenium and tellurium, R1 and R2 represent optionally polar-substituted hydrocarbyl groups and R represents a bivalent bridging group containing at least two carbon atoms in the bridge.
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
- Granted September 3, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 3, 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.