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Expired Canadian patentCanada

Methods of immunoassay

CA 1284104 C · Owner: Biochem Immunosystems L.L.C. · Inventors: Philo, Roger

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Abstract From the Canadian patent

Methods of Immunoassay, The present invention relates to enzyme immunoassays employing one or more enzyme label-substrate pairs which give rise to coloured products and in which absorption by the product of substrate conversion by at least one enzyme label at a first wavelength at or close to the optimum wavelength for absorbance exceeds the linear range of the detector which, immunoassay includes the steps of measuring the said substrate conversion at a second wavelength at which absorbance by the relevant product is significantly lower than at the said first wavelength and calculating the true absorbance at the said first wavelength by utilizing the result of linear regression analysis of …

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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 May 14, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 14, 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.
FiledJune 9, 1987
GrantedMay 14, 1991
Term endedMay 14, 2008
Patent numberCA 1284104 C
Classification (IPC)G01N33/53 +2 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedJune 9, 1987Patent grantedMay 14, 1991Term endedMay 14, 2008

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