×

Heat insulating insert for footwear

  • US 4,658,515 A
  • Filed: 02/05/1985
  • Issued: 04/21/1987
  • Est. Priority Date: 02/05/1985
  • Status: Expired due to Fees
First Claim
Patent Images

1. A heat insulating insole for shoes comprising a laminated pad horizontally and vertically contoured to lie within a shoe beneath the foot of the wearer of the shoe;

  • said laminated pad comprising a bottom sheet, a spacer sheet and a top sheet;

    said bottom and top sheets formed from a flexible organic plastic film and said spacer sheet being formed from a resilient, readily compressible, foamed sheet of organic plastic material having heat insulating properties;

    said spacer sheet being bonded to both said bottom and top sheets;

    said spacer sheet comprising a continuous perimeter disposed between and bonded to the perimeters of said top and bottom sheets, said spacer sheet further having a plurality of transverse bands integrally joining opposite sides of said continuous perimeter to define a plurality of horizontally spaced chambers;

    said chambers being vertically bounded by said top and bottom sheets and horizontally bounded by said transverse bands and said perimeter portion of said spacer sheet;

    said chambers being partially filled with loose particles formed from a resilient organic plastic material having heat insulating properties.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×