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Expired Canadian patentCanada

Thromboxane a.sub.2 synthetase inhibitory 1-(3-pyridyl)-1-alkene derivatives and their production and use

CA 1257275 A · Owner: Takeda Chemical Industries, Ltd. · Inventors: Terao, Shinji; Nishikawa, Kohei

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Abstract From the Canadian patent

Novel compounds of the formula: wherein R2 is an aromatic or heterocyclic group which may op-, tionally be substituted R2 is a methyl group, a hydroxymethyl, group a nitroxymethyl group, a formyl group, a nitrogen-containing five-membered ring-methyl group an acetal-methyl group, a trialkylsilyloxymethyl group an alkyl- or aryl-sulfonyloxy-, methyl group an alkyl- or aryl-sulfonylaminocarbonyloxymethyl group, an acyloxymethyl group, an alkoxycarbonyloxymethyl group a halogenomethyl group, an alkoxymethyl group an aryloxymethyl, group, a cyano group a carbamoyl group which may optionally be substituted, a carbamoyloxymethyl group which may optionally be substituted, a thiocarbamoyloxymethyl …

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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 July 11, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 11, 2006.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 26, 1984
GrantedJuly 11, 1989
Term endedJuly 11, 2006
Patent numberCA 1257275 A
Classification (IPC)C07D213/02 +2 more

Timeline

Timeline From CIPO dates

19851988199119941997200020032006Application filedJuly 26, 1984Patent grantedJuly 11, 1989Term endedJuly 11, 2006

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