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PORTABLE HEAT-MAINTAINING AND WARMING FOOD TRAY

  • US 3,622,753 A
  • Filed: 08/14/1970
  • Issued: 11/23/1971
  • Est. Priority Date: 08/14/1970
  • Status: Expired due to Term
First Claim
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1. A warming device having a self-contained power source, said device including a heatable plate, said plate having secured thereto in heat exchange relation therewith at least one strip of heating tape, said power source comprising rechargeable batteries, switching means connected to said power source for connecting said heating strip to said power source for heating said plate, said switching means including means for automatically disconnecting said strip from said power source when the output voltage of said batteries falls below a predetermined voltage.

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