Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Reexamination Certificate
2000-09-19
2001-10-09
Walberg, Teresa (Department: 3742)
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
C219S385000, C219S386000
Reexamination Certificate
active
06300599
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a wrap heater for use within a delivery bag, and method for heating food product in a delivery bag. In particular, the delivery bag is a pizza delivery bag and the wrap heater is constructed for being provided within the pizza delivery bag.
BACKGROUND OF THE INVENTION
Food products, such as pizza, are frequently prepared and cooked at a store location. The prepared food product is then delivered to a customer at a home or place of business.
A freshly cooked food product may be stored at the store location awaiting a delivery person's transportation of the food product to the customer. During both the storage and the transportation, the product may lose heat and the temperature of the product may decrease. If the product becomes too cool, it may become unacceptable to a customer. As a result, attention has been directed at techniques for keeping a food product warm after it has been cooked.
In the pizza industry, it is common to prepare a pizza and store it in a cardboard box. The cardboard box is then placed under a heat lamp awaiting pickup by a delivery person. The delivery person then stores the cardboard box in a thermally insulated carrying case for delivery to the consumer.
U.S. Pat. No. 5,750,962 to Hyatt and U.S. Pat. No. 4,816,646 to Solomon et al. describe devices which can be used to keep food items warm during transportation.
SUMMARY OF THE INVENTION
A wrap heater is provided by the present invention. The wrap heater includes a first heating sleeve and a second heating sleeve. The first heating sleeve includes a first electrically conductive heating grid, a first stiffening layer for providing rigidity, a first thermostat provided between the first electrically conductive heating grid and the first stiffening layer, and a first cover. The first cover is provided for enclosing the first electrically conductive heating grid, the first stiffening layer, and the first thermostat. The second heating sleeve includes a second electrically conductive heating grid, a second stiffening layer, a second thermostat provided between said second electrically conductive heating grid and said second stiffening layer, and a second cover. The second cover is provided for enclosing the second conductive heating grid, the second stiffening layer, and the second thermostat. An extension is provided for separating the first heating sleeve and the second heating sleeve. The extension allows the first heating sleeve to contact or provide heating of a first surface of a food product while the second heating sleeve contacts or provides heating of a second surface of a food product. Preferably, the first and second surfaces of a food product are opposed surfaces. In the case of pizza, the first and second surfaces of the pizza which are preferably heated by the first and second heating sleeves are the top and bottom surfaces of the pizza In the case, of stacked pizza, the top surface of the top pizza would be closest to one of the heating sleeves, while the bottom surface of the bottom pizza would be closest to the other heating sleeve. The first and second electrically conductive heating grids are constructed for being placed in electrical communication with a power supply.
A method for heating food product, such a pizza, in a delivery bag is provided by the invention. The method includes steps of providing a wrap heater in a food delivery bag, heating the first electrically conductive heating grid and the second electrically conductive heating grid, and providing food product within the food delivery bag.
A pizza delivery bag is provided by the present invention. The pizza delivery bag includes a wrap heater having a first heating sleeve and a second heating sleeve. The pizza delivery bag is constructed and arranged for holding at least two large size pizzas and for containing the wrap heater so that the first heating sleeve is provided underneath the pizzas and the second heating sleeve covers the pizzas.
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Ingrid Inc. advertisements for Thermal Bags (6 pages).
Bostic William M.
Mericle Robert
Owens Byron C.
Fastovsky Leonid
Merchant & Gould P.C.
Vesture Corporation
Walberg Teresa
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