Staged reactor process
CA 2311115 A1 · Owner: Madden, James Daniel · Inventors: Madden, James Daniel; Upham, Stephanie Marie; Michie, William James Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a process for the in situ blending of polymers comprising contacting ethylene and one or more comonomers in two or more fluidized bed reactors connected in series under polymerization, conditions, with a catalyst system comprising (i) a supported or unsupported magnesium/titanium based precursor containing an electron donor and (ii) a hydrocarbyl aluminum cocatalyst in sufficient amount to complete the activation of the precursor the improvement, comprising, (A) increasing or decreasing the melt flow ratio and/or molecular weight of the blend by, respectively decreasing or increasing, the mole ratio of a precursor activator compound to the electron donor; or, (B) increasing or decreasing …
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 June 2, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 2, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 2, 2022.
- 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.