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Expired Canadian patentCanada

Optically active (meth)acrylamides, polymers thereof, process for their preparation, and their use for racemate resolution

CA 1294970 C · Owner: Schwartz, Ulrich · Inventors: Arlt, Dieter; Bomer, Bruno; Grosser, Rolf

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Abstract From the Canadian patent

In the chromatographic separation of a mixture of antipodes of optically active chemicals by passing a solution of such mixture over an optically active adsorbent to effect adsorption, and then eluting the adsorbed material, the improvement which comprises employing as the adsorbent particles of an optically active and cross-linked polymer containing the repeating structural unit, in which, R1 represents hydrogen or methyl and, R2 represents one of the stereoisomers of the eight possible stereoisomeric forms of each of the optically active radicals of the formulae or, Improved separation results. The pure monomers are also new.

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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 January 28, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 28, 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.
FiledSeptember 9, 1986
GrantedJanuary 28, 1992
Term endedJanuary 28, 2009
Patent numberCA 1294970 C
Classification (IPC)C07C233/09 +2 more

Timeline

Timeline From CIPO dates

19871990199319961999200220052008Application filedSep 9, 1986Patent grantedJan 28, 1992Term endedJan 28, 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.