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Metal container system for use in microwave ovens

  • US 4,558,198 A
  • Filed: 12/03/1984
  • Issued: 12/10/1985
  • Est. Priority Date: 12/03/1984
  • Status: Expired due to Fees
First Claim
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1. In combination, a metal container for use in microwave and convection ovens, wherein the microwave oven is supplied with microwave energy by a magnetron, the container having:

  • substantially smooth wrinkle-free side and bottom walls and edges,with the side wall in elevation being provided with a curved configuration of substantial radius,the configuration of the receptacle in plan view being either round or having rounded corners with substantial radii,the substantial radii of the side wall and corners preventing or at least substantially redcuing the concentration of electromagnetic energy in a microwave environment,with the height of the container being 33 millimeters or less,the surfaces of said walls and edges being coated on both sides with a layer of heat-resistant, electrically insulating plastic material of a thickness on the order of 0.25 to 2.5 mils, said plastic material being effective to diffuse and thereby prevent substantial reflection of microwave energy toward the magnetron of the microwave oven, anda heat-resistant, electricaly insulating plastic rigid microwave transparent lid for said container, said lid having edge portions that extend over and beside the edges of the container when the lid is placed thereon, and thus insulate said edges elextrically from the walls of an oven.

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