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Temperature-sensing system for cattle

  • US 4,865,044 A
  • Filed: 03/09/1987
  • Issued: 09/12/1989
  • Est. Priority Date: 03/09/1987
  • Status: Expired due to Term
First Claim
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1. An apparatus for sensing temperature changes in a body comprising:

  • a battery-powered signal generator for generating a signal having a variable frequency;

    frequency modulating means for varying the frequency of the generated signal as a function of the level of the temperature of the body; and

    amplitude modulating means for modulating the amplitude of the generated signal in accordance with a predetermined identification code to thereby tag the generated signal with an encoded amplitude waveform which identifies the body.

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