Olefin polymerization catalyst
CA 2061303 C · Owner: Shell Oil Company · Inventors: Job, Robert Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high activity olefin polymerization catalyst useful in the polymerization of low .alpha.-olefins is obtainable, by contacting an alkylaluminum halide with a solid reaction product of a magnesium alkoxide, a titanium tetraalkoxide and a phenolic compound which is phenol or an activated phenol and may be used to prepare olefin polymers by polymerizing at least one .alpha.-olefin optionally in, conjunction with a selectivity control agent.
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 February 17, 1992 and granted May 2, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 17, 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
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.