Claims
- 1. In combination with a food item capable of having its color changed or being crispened by thermal energy, said food item to be heated in a microwave oven, wrapping material conforming generally to the shape of said food item comprising a flexible dielectric substrate having a thin semiconducting coating thereon residing in a close proximal relation to a substantial surface portion of said food item, said thin semiconducting coating having the property of being able to convert a proportion of the microwave energy of a microwave oven into heat in the coating itself to thereby change the color or crispness of the surface of the food item while permitting the remainder of the said microwave energy to pass through the wrapping material to dielectrically heat the food item.
- 2. The combination of claim 1 in which said semiconducting coating has a specific surface resistance of from about 1 to 300 ohms per square.
- 3. The combination set forth in claim 2 in which said semiconducting coating has a specific surface resistance of from about 1 to about 10 ohms per square.
- 4. The combination set forth in claim 2 in which the coating is evaporated aluminum.
- 5. The combination set forth in claim 2 in which said dielectric substrate constitutes a polyester film.
- 6. The combination set forth in claim 5 including a second plastic layer constituting a polyethylene film, said coating being sandwiched between said polyester and polyethylene films.
- 7. In combination with a food item capable of having its color changed or being crispened by thermal energy, said food item to be heated in a microwave oven, flexible dielectric material having a substantial portion thereof conforming generally to the shape of the food item, and a relatively thin flexible layer of metal carried by said dielectric material, said metallic layer also conforming generally to the shape of said food item and residing in a proximal relation thereto and having the property of being able to convert a proportion of the microwave energy of a microwave oven into heat in the metallic layer itself to thereby change the color or crispness of the surface of the food item adjacent thereto while permitting the remainder of the said microwave energy to pass through the metallic layer and the flexible dielectric material to dielectrically heat the food item.
- 8. The combination set forth in claim 7 in which said metallic layer has a specific surface resistivity between about 1 to 300 ohms per square.
- 9. The combination set forth in claim 8 in which said metallic layer has a specific surface resistivity between about 1 to 10 ohms per square.
- 10. The combination set forth in claim 7 in which said flexible dielectric material constitutes a polyester film, said metallic layer having been evaporated onto said plastic film.
- 11. The combination set forth in claim 10 in which a second plastic film is included said second plastic film confronting the other side of said metallic layer.
- 12. The combination set forth in claim 11 in which said second plastic film is polyethylene.
Parent Case Info
This application is a continuation-in-part of my earlier filed application Ser. No. 910,245, filed May 30, 1978, now abandoned.
US Referenced Citations (11)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
910245 |
May 1978 |
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