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Expired Canadian patentCanada

Adsorbent for purification of blood coagulation factor viii and process for purification of blood coagulation factor viii using the same

CA 1283073 C · Owner: Kanegafuchi Kagaku Kogyo Kabushiki Kaisha · Inventors: Tani, Nobutaka; Nagano, Youko

CIPO record

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Abstract From the Canadian patent

An adsorbent for blood coagulation factor VIII which is a water-insoluble porous gel having an exclusion limit of from 8 x 105 to 1 x 108 and having sulfate group on at least a part of the surface thereof and a process for purification of blood coagulation factor VIII comprising adsorption of factor VIII with the above adsorbent and collection of factor VIII by elution. In the above process, factor VIII is adsorbed with a good selectivity and collected in a high yield.

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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 April 16, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 16, 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.
FiledFebruary 13, 1987
GrantedApril 16, 1991
Term endedApril 16, 2008
Patent numberCA 1283073 C
Classification (IPC)B01J20/22 +2 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedFeb 13, 1987Patent grantedApril 16, 1991Term endedApril 16, 2008

Sources & verification

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