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Electric warmer with a current sensor

  • US 7,002,111 B2
  • Filed: 03/16/2005
  • Issued: 02/21/2006
  • Est. Priority Date: 03/19/2004
  • Status: Expired due to Fees
First Claim
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1. An electric warmer for heating a container by means of a heat transfer medium, said warmer comprising a jar into which the container can be inserted for heating, and an electric heating device comprising at least one resistance heating element for heating the heat transfer medium,wherein said warmer comprises a sensor element for measuring the current flowing through the resistance heating element during operation of the heating device and a control unit,wherein said control unit is adapted for detecting a characteristic change in the current flowing through the resistance heating element due to a change in the state of aggregation of the medium to be heated, and for controlling power supply to the resistance heating element in response to the state of aggregation of the medium to be heated, andwherein said characteristic change in the current comprises an abrupt decrease of the current.

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