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Temperature controlled timer

  • US 4,378,486 A
  • Filed: 12/29/1980
  • Issued: 03/29/1983
  • Est. Priority Date: 04/24/1980
  • Status: Expired due to Term
First Claim
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1. A temperature controlled timer comprising:

  • (a) a clock having a settable alarm time output adapted to provide a signal pulse having a leading edge at said set time,(b) a first interval timer connected in a circuit path to said alarm output adapted to begin timing a first interval of time upon detection of said leading edge,(c) a temperature sensor connected to the interval timer for controlling the duration of said first interval of time with temperature,(d) a second interval timer connected in a circuit path to the first interval timer adapted to begin timing a second interval of time following the end of the first interval of time,(e) manual control means for controlling the duration of the second interval of time, and(f) an output circuit for generating a power control signal during the second interval of time,(g) the temperature sensor being adapted to generate a signal to progressively and continuously increase the duration of the first interval of time with increase in temperature whereby the second interval of time is reduced to zero at a predetermined temperature.

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