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Expired Canadian patentCanada

Information recording device and information recording and reproducing process

CA 1331219 C · Owner: Kawase, Toshimitsu · Inventors: Yamano, Akihiko; Nose, Hiroyasu; Kawase, Toshimitsu

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Abstract From the Canadian patent

The present invention relates to an information recording device, comprising: a) a recording medium;, b) a probe electrode capable of recording on the recording medium by applying a voltage between the electrode and the recording medium; and c) a displacement detecting means for, detecting the force acting between the recording medium and the probe electrode as the displacement amount of the probe electrode when they are approximated to each other, and, an information recording process comprising: the step of approximating a probe electrode to a recording medium comprising an electroconductive substrate and an organic thin film having electric memory effect formed thereon;, the step 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 August 2, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 2, 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.
FiledMarch 22, 1989
GrantedAugust 2, 1994
Term endedAugust 2, 2011
Patent numberCA 1331219 C
Classification (IPC)G11B9/00

Timeline

Timeline From CIPO dates

19901993199619992002200520082011Application filedMarch 22, 1989Patent grantedAug 2, 1994Term endedAug 2, 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.