Cushioning device with improved flexible barrier membrane

Details Cushioning device with improved flexible barrier membrane Cushioning device with improved flexible barrier membrane

1995-10-30

1998-02-03

Dye, Rena

Boots, shoes, and leggings

Soles

Spring heel

36 71, 428 366, 428 367, 428 368, 428 69, 428 76, A43B 1312, A43B 1320

Patent

active

057131414

ABSTRACT:
Products in the form of cushioning devices made from flexible membranes employing at least one layer including thermoplastic urethane and at least one layer of a copolymer of ethylene and vinyl alcohol are inflatable to a relatively high pressure. The cushioning devices maintain the internal inflatant pressure for extended periods of time by employing a phenomenon referred to in the industry as diffusion pumping. Ideally, the cushioning devices of the present invention can be permanently inflated with gases such as nitrogen or air.

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