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US 4,136,222 AGranted
Thermally insulating sheet material
AssigneeMinnesota Mining and Manufacturing Company
InventorNelson Jonnes
Life of this patent
Estimating the term…
Abstract
A new thermally insulating sheet material in which a thin drapeable specularly reflective sheet is supported in spaced relation from a thermally radiating surface by an array of resiliently flexible and compressible polymeric foam segments that cover only a portion of the area of the sheet.
Claims14
A sheet material useful as thermal insulation in garments and the like comprising
- (1) at least one thin lightweight drapeable sheet carrying a vapor-deposited layer of specularly reflective material on at least one surface;
- and
- (2) at least one separator layer between about one-fourth and one-and-one-half centimeters thick adhered to said sheet and comprising an open array of resiliently flexible supple and compressible polymeric foam segments having a density less than about 0.5 gram/cubic centimeter, said array of segments covering between about 10 and 60 percent of the area of said sheet and having a maximum span across an open area of the array of no more than about 5 centimeters, and said separator layer exhibiting a reduction in thickness of no more than about 50 percent under a static load of 7 grams/square centimeter and a regain after brief compression at 70 grams/square centimeter of at least about 90 percent.
A sheet material useful as thermal insulation in garments and the like comprising
- (1) at least one thin lightweight drapeable sheet carrying a vapor-deposited layer of specularly reflective material on at least one surface;
- and
- (2) at least one separator layer between about one-half and one centimeter thick adhered to a side of said sheet and comprising an open array of resiliently flexible supple and compressible polymeric foam segments having a density less than about 0.5 gram/cubic centimeter and averaging less than about 5 millimeters in width, said array of segments covering between about 10 and 30 percent of the area of said sheet and having a maximum span across an open area of the array of no more than about 3 centimeters, and said separator layer exhibiting a reduction in thickness of no more than about 50 percent under a static load of 7 gram/square centimeter and a regain after brief compression at 70 grams/square centimeter of at least about 90 percent.
Dependencies are inferred from the claim text.