Food warming device and system

• US 8,344,296 B2
• Filed: 10/10/2007
• Issued: 01/01/2013
• Est. Priority Date: 10/10/2007
• Status: Active Grant

• Current Assignee: Cooktek Induction Systems, LLC (Middleby Corporation)
• Original Assignee: Cooktek Induction Systems, LLC (Middleby Corporation)
• Inventors: Metz, Reinhard, Graber, Warren
• Primary Examiner(s): Yuen, Henry
• Assistant Examiner(s): Nguyen, Hung D
• Application Number:
  US11/869,822
• Publication Number:
  US 20090095736A1
• Time in Patent Office: 1,910 Days
• Field of Search: 219620-622, 219/626, 219/627, 219/663, 219/667, 219/624, 219/665, 219/625, 126/246, 340/572.1, 340/825.37, 994/51, 99D/IG.14
• US Class Current: 219/620
• CPC Class Codes: H05B 2213/07 Heating plates with temperature control means
• CPC Class Codes: H05B 6/062 for cooking plates or the like

Abstract

An apparatus, system and method for warming food by controlled heating of heat retention objects such as cookware items or pellets located on a trivet positioned on a countertop, using heating control units, such as induction heating units, remotely located beneath the countertop. The preferred trivet insulates the countertop against damages, and also includes circuitry enabling the indication or display of its proper positioning on the countertop, and also indicating whether the heating unit is heating the heat retention object.

Claims

1. An apparatus for measuring and controlling the temperature of a heat retention object used in connection with an induction heating control unit to warm or to keep warm a food item, comprising:

a trivet in contact with the heat retention object, the trivet resting on a countertop, the countertop is positioned above a cooktop of the induction heating control unit, wherein the trivet acts as an insulator to limit the amount of heat transferring from the heat retention object through the trivet to the countertop, and wherein the trivet is readily useable with different heat retention objects in a variety of shapes and sizes; and

a tag associated with the trivet, the tag being capable of communication with a reader associated with an induction heating control unit located below the countertop, enabling controlled heating of the heat retention object;

wherein the trivet includes electronic circuitry to facilitate the indication of its proper positioning on the countertop within the magnetic field range of the induction heating control unit, so as to allow controlled heating of an object by the induction heating control unit, and further comprising means for indicating to a user when the trivet is properly positioned, wherein the indicating means is located on the trivet, is powered by the magnetic field of the induction heating control unit, and is in electrical communication with the trivet electronic circuitry.

2. The apparatus of claim 1,

further comprising a temperature sensor associated with the tag and in contact with the heat retention object, enabling the tag to transmit the temperature of the heat retention object to the induction heating control unit.

3. The apparatus of claim 2, wherein the trivet includes channels and/or cavities.

4. The apparatus of claim 3, wherein the electronic circuitry located on the trivet is located within the channels or cavities.

5. The apparatus of claim 2, further comprising processor means communicating with sensors and displays to indicate operating conditions of the heating control unit or the heat retention object to the user.

6. The apparatus of claim 1, wherein the heating control unit comprises an induction heating unit which transmits magnetic waves to the heat retention object.

7. The apparatus of claim 6, wherein the tag comprises an RFID tag and the reader comprises an RFID reader.

8. The apparatus of claim 6, wherein the indicating means comprises a visual display showing a user when the trivet is properly positioned within the magnetic field of the induction heating unit.

9. The apparatus of claim 8, wherein the indicating means also displays whether the induction heating unit is currently heating the heat retention object, and the indicating means comprises an LED.

10. The apparatus of claim 1, wherein the heat retention object comprises an item of cookware.

11. The apparatus of claim 1, wherein the heat retention object comprises either a food container or a heat retentive pellet.

12. The apparatus of claim 1, wherein the countertop is made from one or more of the following materials:

stone;

composites;

formica;

glass;

ceramic;

or wood.

13. An apparatus including an induction heating control unit positioned beneath a countertop for measuring and controlling the temperature of a heat retention object to be indirectly heated, comprising:

a trivet supporting the heat retention object, the trivet resting on the countertop, wherein the countertop is positioned above a cooktop of the induction heating control unit, and wherein the trivet acts as an insulator to limit the amount of conducted and radiated heat transferring from the heat retention object through the trivet to the countertop, and the trivet is readily useable with different heat retention objects in a variety of shapes and sizes;

wherein the trivet has associated with it an RFID tag, the tag being capable of communication with an RFID reader associated with the induction heating control unit; and

wherein the trivet includes electronic circuitry to facilitate the indication of its proper positioning on the countertop within the magnetic field range of the induction heating control unit, so as to allow controlled heating of an object by the induction heating control unit, and further comprising display means for visually indicating to a user when the trivet is properly positioned, wherein the display means is located on the trivet, is powered by the magnetic field of the induction heating control unit, and is in electrical communication with the trivet electronic circuitry.

14. The apparatus of claim 13, wherein the heat retention object comprises either a food container or an item of cookware.

15. The apparatus of claim 13, wherein the trivet includes an insulating lower portion and a metallic upper portion to which the RFID tag is attached.

16. A system for measuring and controlling temperatures of heat retention objects used to warm or to keep warm food items, using an induction heating control unit, comprising:

a trivet supporting the heat retention object, the trivet resting on a countertop, wherein the countertop is positioned above a cooktop of the induction heating control unit, and wherein the trivet acts as an insulator to limit heat transferring from the heat retention object through the trivet to the countertop, and the trivet is readily useable with different heat retention objects in a variety of shapes and sizes;

a tagging object associated with either the trivet or the heat retention object; and

a heater control unit in communication with a reader capable of receiving information from the tagging object, enabling directly controlled heating of either the trivet or the heat retention object;

wherein the trivet includes electronic circuitry to facilitate the indication of its proper positioning on the countertop, so as to allow controlled heating of an object by the heating control unit, and further comprising display means for visually indicating to a user when the trivet is properly positioned, and wherein the display means is located on the trivet, is powered by the magnetic field of the induction heating control unit, and is in electrical communication with the trivet electronic circuitry.

17. The system of claim 16, wherein the heater control unit employs induction heating to heat either the trivet or the heat retention object using information provided by the tagging object that has been communicating with the reader.

18. The system of claim 16, wherein the heat retention object comprises either a food container or an item of cookware.