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Expired Canadian patentCanada

Microwave heating apparatus with solid state microwave oscillating device

CA 1202090 A · Owner: Tokyo Shibaura Denki Kabushiki Kaisha · Inventors: Konno, Mitsuo; Taniguchi, Koichi; Okatsuka, Hisashi

CIPO record

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

Abstract of the Disclosure, A microwave heating apparatus comprises a solid state oscillating circuit, a pre-amplifier module for amplifying the output of the oscillating circuit a, plurality of amplifier modules for amplifying the output of the pre-amplifier module, a first power supply source for energizing the solid state oscillating circuit and a second power supply source for energizing all of the amplifier modules. Such an apparatus further comprises a delay circuit for activating the first power supply source after the second power supply source has been activated and the amplifier modules have been in a stable state.

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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 March 18, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 18, 2003.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 19, 1983
GrantedMarch 18, 1986
Term endedMarch 18, 2003
Patent numberCA 1202090 A
Classification (IPC)H05B6/66 +2 more

Timeline

Timeline From CIPO dates

1984198619881990199219941996199820002002Application filedSep 19, 1983Patent grantedMarch 18, 1986Term endedMarch 18, 2003

Sources & verification

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