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Cooking vessel with water detection means

  • US 5,545,877 A
  • Filed: 06/02/1994
  • Issued: 08/13/1996
  • Est. Priority Date: 06/02/1994
  • Status: Expired due to Fees
First Claim
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1. A control means for use with a cooking to detect water in a cooking vessel including:

  • cooking chamber means to receive liquid;

    heater means to supply heat to said liquid in said chamber;

    control means to measure the temperature of said liquid and control supply of heat of to said liquid to adjust temperature of said liquid;

    temperature signal retention means to receive said temperature signal and hold said temperature signal;

    timing means to periodically activate said signal retention means to receive and hold said temperature signal as a current retained signal;

    memory means to receive and hold said current retained signal and hold at least one previous retained signal and compare said previous retained signals with said current retained signal;

    calculator means to determine change of said liguid temperature between said previous retained signal and said current retained signal as a current time/temperature differential;

    second memory means to receive and hold said current time/temperature differential and at least one previous change time/temperature differential;

    comparator means to receive said current time/temperature differential and said previous time/temperature differential to compare said current time/temperature differential and second controller means to receive said comparator and generate comparator signal to operate said heater control means to restrict supply of heat to said liquid if said previous time/temperature differential said current time/temperature differential are in selected relationship; and

    switch means to sense said liquid temperature and activate said second controller means when said liquid temperature is in selected temperature range.

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