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Microwave oven temperature indicator and control means

  • US 4,297,557 A
  • Filed: 05/03/1976
  • Issued: 10/27/1981
  • Est. Priority Date: 05/03/1976
  • Status: Expired due to Term
First Claim
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1. The combination of a microwave oven and telemetric temperature probe therefor which comprises:

  • (a) a microwave oven housing having internal walls defining and providing microwave shielding about an oven cavity;

    (b) a telemetric temperature probe including;

    (b1) microwave antenna means and power supply circuit means in circuit therewith to generate a power supply from received microwave radiation;

    (b2) temperature responsive oscillator circuit mean driven by said power supply means to generate an oscillatory signal temperature modulated frequency and of a frequency distinct from said microwave frequency;

    (b3) electromagnetic wave transmission means to broadcast said oscillatory signal; and

    (b4) a probe housing having shielding means surrounding said power supply circuit means, oscillator circuit means and wave transmission means and of selective permeability to limit transmission of microwave energy while permitting transmission of said broadcast oscillatory signal;

    (c) signal receiver means mounted in said oven to receive said broadcast oscillatory signal; and

    (d) shielding means, of selective permeability to limit transmission of microwave energy while permitting transmission of said broadcast oscillatory signal, in said oven and surrounding said signal receiver means.

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