Patent ID: 6877286

Claim:
An insulative window covering, configured to be frictionally inserted into a window opening in a building, comprising: a) a first sheet of substantially transparent material, having an inner and outer surface, a perimeter, and comprising at least one inwardly extending, flat-topped deformation; b) an oppositely facing second sheet of substantially transparent material, having an inner and outer surface in parallel alignment with the first sheet, having a perimeter aligned with the perimeter of the first sheet, and comprising at least one flat-topped deformation extending inwardly toward and in alignment with the inwardly extending flat-topped deformation of the first sheet, the flat-topped deformations of the first and second sheets being bonded together; and c) a strip of resilient, compressible material, bonded around the periphery of the first sheet and the second sheet, configured to provide a substantially airtight enclosure envelope between the two sheets, and to provide a substantially airtight seal between the window opening and the window covering.