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Expired Canadian patentCanada

Method for forming a gel bed in a column for liquid chromatography and an axially adjustable-type column device used for this method

CA 1329144 C · Owner: Sakamoto, Kiyoaki · Inventors: Sakamoto, Kiyoaki; Nomura, Masaki; Matsubara, Kenichi

CIPO record

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Abstract From the Canadian patent

A method to form a gel bed in a cylindrical column for liquid chromatography, comprising providing, a gel bed section between upper and lower liquid-tight partition members, positioned apart from each other at upper and lower positions in the column continuously, percolating liquid downward through the gel bed section to form a gel bed in the gel bed section and applying a liquid pressure onto the upper partition to move the partition member downward following a downward movement of the upper surface of the gel bed and a device therefor.

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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 3, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 3, 2011.
  • 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 24, 1989
GrantedMay 3, 1994
Term endedMay 3, 2011
Patent numberCA 1329144 C
Classification (IPC)G01N30/56 +2 more

Timeline

Timeline From CIPO dates

19901993199619992002200520082011Application filedFeb 24, 1989Patent grantedMay 3, 1994Term endedMay 3, 2011

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