Heating element for a microwavable package
First Claim
1. An active microwave energy heating element for use in a microwavable package to heat generally uniformly a food product within said package, the food product resting at least partially on said active microwave energy heating element, said active microwave energy heating element comprising:
- a substrate;
a plurality of energy collecting structures on said substrate, each of said energy collecting structures including resonant loops having a perimeter sufficient to limit currents induced therein to below a predetermined level upon impingement by incident microwave energy;
an a plurality of tuned structures on said substrate at spaced locations and positioned between adjacent resonant loops, said energy collecting and tuned structures distributing energy across said substrate to heat generally uniformly said food product and inhibiting charring of said microwavable package.
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Accused Products
Abstract
A microwavable package includes a base to support a food product, an active microwave energy heating element is on the base to effect heating of the food product upon impingement by microwave energy. A cover spaced from and separate to the active microwave energy heating element overlies the food product. The cover includes microwave energy interactive material extending substantially over the food product and at least one layer of suscepting material interposed between the food product and the microwave energy interactive material. A plurality of apertures are formed in the microwave energy interactive material and are spaced apart about a peripheral margin of the cover. The apertures are sized to promote localized fields to enhance the at least one layer of suscepting material and promote browning of the food product when exposed to incident microwave energy.
241 Citations
20 Claims
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1. An active microwave energy heating element for use in a microwavable package to heat generally uniformly a food product within said package, the food product resting at least partially on said active microwave energy heating element, said active microwave energy heating element comprising:
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a substrate;
a plurality of energy collecting structures on said substrate, each of said energy collecting structures including resonant loops having a perimeter sufficient to limit currents induced therein to below a predetermined level upon impingement by incident microwave energy;
an a plurality of tuned structures on said substrate at spaced locations and positioned between adjacent resonant loops, said energy collecting and tuned structures distributing energy across said substrate to heat generally uniformly said food product and inhibiting charring of said microwavable package. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An active microwave energy heating element for use in a microwavable package to heat generally uniformly a food product within said package, the food product resting at least partially on said active microwave energy heating element, said active microwave energy heating element comprising:
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a substrate;
a plurality of energy collecting structures on the substrate, each energy collecting structure including at least two resonant loops and at least a pair of transmission line connecting the two or more resonant loops;
a plurality of tuned structures, each tuned structure being positioned on the substrate generally between adjacent resonant loops of the plurality of energy collecting structures. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification