Bisindenyl derivative, and a process for the preparation thereof
CA 2006905 A1 · Owner: Rohrmann, Jurgen · Inventors: Rohrmann, Jurgen; Antberg, Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the disclosure: Bisindenyl derivate, and a process for the preparation thereof. A bisindenyl derivate of the formula I (I), (M1 = Si or Ge, R6 and R7 = unsubstituted or substituted indenyl radical), is obtained in very good yield by reacting a compound of the formula II, (II), (X = halogen), with a compound of the formula III or IV R6 - M2 (III) R7-M2 (IV), (M2 = alkali metal) if, in the reaction, compound III or IV is added slowly to compound II. Compound I is suitable as a starting material for the preparation of metallocene catalyst components.
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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 December 29, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 29, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 29, 2011.
- 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.