The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 31, 1994
Filed:
Feb. 05, 1992
Lawrence C Brandberg, Edina, MN (US);
Jeffrey T Watkins, Eden Prairie, MN (US);
Golden Valley Microwave Foods Inc., Edina, MN (US);
Abstract
The present invention provides an insulating microwave heating package with a multiplicity of latent, uninflated or potential insulation chambers capable of inflating when exposed to microwave energy. The package includes at least two superimposed inner and outer pieces of flexible sheet material bonded together at selected points, patches or along seal lines separated by unsealed areas which define side-by-side unfilled, i.e., potential, inflation chambers between the lines, patches or points. Upon exposure to microwave energy, the package and its contents become heated. As a result of this heating process, the unfilled chambers also become heated, causing them to become filled with hot expanding air or moisture vapor. These chambers serve as insulation for the package and enhance heating of the food by reducing heat loss from the package.