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Expired Canadian patentCanada

Nucleophilic polysubstituted aryl acridinium ester and uses thereof

CA 1339491 C · Owner: Bayer Corporation · Inventors: Chang, Steve Chin-Shen; Law, Say-Jong; Vitkauskas, Christine Anne

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Overview

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Abstract From the Canadian patent

This invention is directed to novel nucleophilic polysubstituted aryl acridinium esters and to novel conjugates thereof. The novel nucleophilic polysubstituted aryl acridinium esters and novel conjugates thereof are useful in biological assays, including novel assays for the determination of Vitamin B12, folate, cortisol, estradiol, and thromboxane B2.

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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 October 7, 1997. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 7, 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.
FiledJuly 31, 1989
GrantedOctober 7, 1997
Term endedOctober 7, 2014
Patent numberCA 1339491 C
Classification (IPC)C07D219/04 +2 more

Timeline

Timeline From CIPO dates

199019931996199920022005200820112014Application filedJuly 31, 1989Patent grantedOct 7, 1997Term endedOct 7, 2014

Sources & verification

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