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Expired Canadian patentCanada

Pyridine ligands for preparation of organic carbonates

CA 1297889 C · Owner: Bhattacharya, Ajit K. · Inventors: Bhattacharya, Ajit K.

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Abstract From the Canadian patent

PYRIDINE LIGANDS FOR, PREPARATION OF ORGANIC CARBONATES D#78,463-F, ABSTRACT OF THE INVENTION, An organic carbonate such as dimethyl carbonate is prepared by reacting an alcohol such as methanol with carbon monoxide and oxygen in the presence of a catalyst system containing Cu(OMe)Cl as a catalyst and a pyridine compound as a ligand of the catalyst system.

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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

  • Granted March 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 2009.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 20, 1986
GrantedMarch 24, 1992
Term endedMarch 24, 2009
Patent numberCA 1297889 C
Classification (IPC)C07C68/04 +1 more

Timeline

Timeline From CIPO dates

19871990199319961999200220052008Application filedOct 20, 1986Patent grantedMarch 24, 1992Term endedMarch 24, 2009

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.