A polymerisation process
CA 2335754 A1 · Owner: Irvine, Derek John · Inventors: Cameron, Paul Alexander; Irvine, Derek John; Gibson, Vernon Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polymerisation process for the preparation of vinylic polymers from the corresponding vinylic monomers which process comprises the step of reacting a vinylic monomer in the presence of a catalyst system comprising a) a metal complex of general formula (I) where A is selected from the group consisting of nickel, iron, cobalt, chromium, manganese titanium, zirconium, vanadium , and the rare earth metals; L1 L2, L3 and L4 are ligands and b) a Lewis acid of general formula (II) wherein at least one of W Y or Z is capable of , formming a co-ordination bond with A and the others of W Y and Z are bulky , groups; D is selected from the group consisting of aluminium magnesium, zinc , and …
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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 June 4, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 4, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 4, 2021.
- 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
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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.