Modified polysiloxane catalysts and a method of using the same
CA 2261822 A1 · Owner: Lyondell Petrochemical Company · Inventors: Tyrell, John A.; Nagy, Sandor; Cribbs, Leonard V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Catalysts for the polymerization of olefins contain units of formula (I) wherein: each R is independently selected from a C1 to C10 aliphatic or cycloaliphatic group or a C6 to C18 aryl aralkyl, or alkaryl; each R2 is , independently selected from hydride R, and Q radicals wherein at least one R2 is Q; Q has the general formula: LMpL'rXp-r-1 wherein L is a monoanionic , aromatic ancillary ligand pi-bonded to M and covalently bonded to Si; L' is a monoanionic aromatic ancillary ligand pi-bondned to M and optionally bonded to L through a covalent bridging group; M is a metal selected from Groups 3-10 of the Periodic Table or lanthanides; X is independently selected from a hydride …
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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 May 28, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 28, 2019.
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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.