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Cushioning device with improved flexible barrier membrane

  • US 6,521,305 B1
  • Filed: 09/14/1999
  • Issued: 02/18/2003
  • Est. Priority Date: 08/31/1994
  • Status: Expired due to Term
First Claim
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1. A permanently sealed and permanently inflated membrane, comprisinga first layer including thermoplastic polyurethane;

  • and a second layer including a copolymer of ethylene and vinyl alcohol;

    wherein reactive contact consisting essentially of hydrogen bonding occurs along substantially the entire surface area of contact between the thermoplastic polyurethane and copolymer of ethylene and vinyl alcohol layers and further wherein said membrane controls the rate of outward diffusion of an internal gas of said membrane and allows diffusion pumping of an external mobile gas into the membrane.

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