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Microwave impedance matching film for microwave cooking

  • US 5,424,517 A
  • Filed: 10/27/1993
  • Issued: 06/13/1995
  • Est. Priority Date: 10/27/1993
  • Status: Expired due to Term
First Claim
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1. A package for storing and microwave heating food comprising:

  • (a) a package body substantially transparent to microwave energy forming a food receiving cavity including a bottom panel and a top panel with side panels joining said bottom panel with said top panel; and

    (b) impedance matching means provided on a surface of at least one of said bottom panel, top panel and side panels for impedance matching microwave energy entering the package, said impedance matching means comprising a contiguous film of flakes embedded in a dielectric binder wherein said impedance matching means is sized and spaced with respect to the food to cause impedance matching to elevate the temperature of the food by increasing the amount of microwave energy directed to the food in at least a predetermined area thereof dependent upon the size and spacing of said film without interacting with the microwave energy to produce heat.

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