Composition for preparation of an organozinc compound
CA 2574055 A1 · Owner: Syngenta Limited · Inventors: Blacker, Andrew John; Fielden, Jan Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a composition of matter obtained by mixing a Lewis acid, a chelator selected from aminoalcohol, aminothiol, diamine or diol in which the, chelating groups are separated by 2 or 3 carbon atoms and an organozinc compound of formula ZnR11R12 wherein R11 and R12 are each independently organic groups, provided that at least one of R11 and R12 comprises an aromatic moiety. The composition may be used to form compounds of formula II (see formula II)
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 December 15, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 15, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 15, 2019.
- 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.