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Expired Canadian patentCanada

Heterocyclic disulfides and their use as immunomodulators

CA 1292990 C · Owner: Fleischmann, Klaus · Inventors: Dickneite, Gerhard; Fleischmann, Klaus; Schorlemmer, Hans-Ulrich

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

Heterocyclic disulfides of the general formula heterocycle-S-S-heterocycle, processes for their preparation and their use, in particular, for immunostimulation immuno-, restoration and cytostatic treatment and pharmaceutical, agents, containing a disulfide of this type for these, indications.

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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 December 10, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 10, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 11, 1986
GrantedDecember 10, 1991
Term endedDecember 10, 2008
Patent numberCA 1292990 C
Classification (IPC)C07D253/06 +2 more

Timeline

Timeline From CIPO dates

19871990199319961999200220052008Application filedMarch 11, 1986Patent grantedDec 10, 1991Term endedDec 10, 2008

Sources & verification

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