Olefin polymerization catalyst
CA 2053109 C · Owner: Union Carbide Chemicals & Plastics Technology Corporation · Inventors: Job, Robert Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved high activity olefin polymerization catalyst which can be used to produce .alpha.-olefin polymers having good properties and a relatively narrow particle size distribution comprises an organoaluminum cocatalyst a, selectivity control agent and a novel olefin polymerization procatalyst which is obtainable by contacting a tetravalent titanium halide, a halohydrocarbon, an electron donor and a solid procatalyst precursor obtainable by heating an adduct of a carbonated magnesium ethoxide and a phenolic compound of enhanced acidity.
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 October 9, 1991 and granted April 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 9, 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.