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Expired Canadian patentCanada

Water-compatible reducible compounds and their use in analytical compositions and methods

CA 1281715 C · Owner: Lum, Vanessa R. · Inventors: Mura, Albert J.; Lum, Vanessa R.; Belly, Robert T.

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Abstract From the Canadian patent

Abstract of the Disclosure, Certain water-compatible reducible compounds are useful in analytical compositions and elements for assay of various analytes, e.g. microorganisms. These compounds comprise a moiety which provides a detectable species (e.g. a dye) when released from the compound at physiological pH. Further these, compounds are aromatic derivatives or quinones having water-compatibilizing substituents which allow them to be used in compositions without the use of surfactants.

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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 19, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 19, 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.
FiledAugust 1, 1986
GrantedMarch 19, 1991
Term endedMarch 19, 2008
Patent numberCA 1281715 C
Classification (IPC)C09B13/00 +2 more

Timeline

Timeline From CIPO dates

19871990199319961999200220052008Application filedAug 1, 1986Patent grantedMarch 19, 1991Term endedMarch 19, 2008

Sources & verification

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