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Expired Canadian patentCanada

Benzodiazepines assay, tracers, immunogens and antibodies

CA 1339439 C · Owner: Wang, Nai-Yi · Inventors: Keegan, Candace Linda; Wang, Philip Pei; Flentge, Charles Arthur

CIPO record

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Abstract From the Canadian patent

The present invention is directed to a fluorescence polarization assay for benzodiazepines and their metabolites, to the various components needed for preparing and carrying out such an assay and to methods of making these components. Specifically tracers, immunogens and antibodies are disclosed as well as, methods for making them. The assay is conducted by measuring the degree of polarization retention of the fluorescence resulting when a sample mixed with antiserum and tracer is irradiated with plane-polarized light.

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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 September 2, 1997. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 2, 2014.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 23, 1987
GrantedSeptember 2, 1997
Term endedSeptember 2, 2014
Patent numberCA 1339439 C
Classification (IPC)C07D243/24 +2 more

Timeline

Timeline From CIPO dates

198819911994199720002003200620092012Application filedOct 23, 1987Patent grantedSep 2, 1997Term endedSep 2, 2014

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