Process for the preparation of a high molecular weight olefin polymer
CA 2084015 A1 · Owner: Kueber, Frank · Inventors: Kueber, Frank; Dolle, Volker; Winter, Andreas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of a high molecular weight olefin polymer, A very active catalyst system for olefin polymerization comprises a cocatalyst, preferably an aluminoxane and a, metallocene of the formula I, (I) in which, preferably, M1 is Zr or Hf, R1 and R2 are alkyl or halogen, R3 is hydrogen, R4 to R6 are alkyl or aryl -(CR8R9)m-R7-(CR8R9)n is a single- or multi-membered chain in which R7 can also be a (substituted) hetero atom and, m + n is zero or 1.
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 November 27, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 2014.
- 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.