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Expired Canadian patentCanada

Method for making organobis(thioether)s, and products obtained therefrom

CA 1331618 C · Owner: Anderson, Patricia Pike · Inventors: Anderson, Patricia Pike; Evans, Thomas Lane; Takekoshi, Tohru

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Abstract From the Canadian patent

A method is provided for making, organobis(thioether)s which include bis(thioetherimide)s and bis(thioetherahhydride)s. There is also provided alkylene bis(thioetherimide)s and the corresponding dianhydrides thereof which can be used to make crystalline polyimides.

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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.

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Why it's free to use

  • Granted August 23, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 23, 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.
FiledMay 5, 1988
GrantedAugust 23, 1994
Term endedAugust 23, 2011
Patent numberCA 1331618 C
Classification (IPC)C07D209/48 +2 more

Timeline

Timeline From CIPO dates

19891992199519982001200420072010Application filedMay 5, 1988Patent grantedAug 23, 1994Term endedAug 23, 2011

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Canadian Patents DatabaseClaims, description, documents and status.CIPO

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