Catalyst compositions and process for preparing polyolefins
CA 2105013 A1 · Owner: Bp Chemicals Limited · Inventors: Mcnally, John Paul; Little, Ian Raymond
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Catalyst Compositions and Process for Preparing Polyolefins Catalyst compositions comprising both metallocene complexes having polymerisable groups and polymerization catalysts eg Ziegler- Natta may be used for the preparation of polyolefins. The catalyst compositions may comprise the metallocene complex in the form of a polymer and may suitably be supported on inorganic supports. Polymers having a wide range of molecular weights and comonomer distributions may be prepared by use of the catalyst compositions. Preferred metallocene complexes are zirconium complexes in which the polymerisable group is vinyl.
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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 August 27, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 27, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 27, 2015.
- 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.