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Expired Canadian patentCanada

Method and apparatus for generating and detecting magnetization response from ferromagnetic, ferrimagnetic paramagnetic, or diamagnetic materials

CA 1282829 C · Owner: Hartai, Julius · Inventors: Lekven, Nils C.; Hartai, Julius; Olsen, Terje

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Abstract From the Canadian patent

A method and apparatus for generating and detecting magnetization responses from ferromagnetic ferrimagnetic, paramagnetic, or diamagnetic materials comprises a means for generating an alternating magnetic field. The cycle of the alternating magnetic field includes a first magnetization pulse and a second demagnetization pulse, the energy content of the magnetization pulse and the demagnetization pulse being approximately equal the time, duration of the magnetization pulse being substantially longer than the time period of the magnetization pulse the, demagnetization pulse having a higher magnetic field strength than the magnetization pulse magnetic field strength. The effect of the …

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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 9, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 9, 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 16, 1987
GrantedApril 9, 1991
Term endedApril 9, 2008
Patent numberCA 1282829 C
Classification (IPC)G01N27/72

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedFeb 16, 1987Patent grantedApril 9, 1991Term endedApril 9, 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.