LOAD CARRYING CUSHIONING DEVICE WITH IMPROVED BARRIER MATERIAL FOR CONTROL OF DIFFUSION PUMPING
 Inventor: Marion F. Rudy, Northridge, Calif.
 Assignee: R. C. Bogert, Marina Del Rey, Calif.
 Appl. No.: 298,899
 Filed: Jan. 19,1989
 Int CI.' A43B 13/18; A61F 05/14
 UJS. Q 36/29; 36/71;
 Field of Search 36/29, 43, 71, 44;
128/594, 383; 428/35.4, 12, 69, 72, 158, 166, 178; 5/441, 442, 449, 450, 455; 2/413;
 References Cited
U.S. PATENT DOCUMENTS
4,183,156 1/1980 Rudy 36/29
4,340,626 7/1982 Rudy 128/594
4,817,304 4/1989 Parker et al. 36/29
Primary Examiner—Steven N. Meyers
Attorney, Agent, or Firm—Beehler & Pavitt  ABSTRACT
A product in the form of a cushioning device made from thermoplastic film containing crystalline material inflated to a relatively high pressure and sealed at the time of manufacture. The product maintains the internal inflatant pressure for long periods of time by employing a form of the diffusion pumping phenomenon of selfinflation in which the mobile gas is the gas components of air other than nitrogen. Improved and novel cushioning devices use new materials, for the film of the enclosure envelope which can selectively control the rate of diffusion pumping, thereby permitting a wider latitude flexibility and greater accuracy in the design of such new cushioning device, thus improving the performance and reducing cost of such devices while eliminating some of the disadvantages of the earlier products. It is possible to permanently inflate certain types of new devices using readily available gases such as nitrogen, or air in which case nitrogen forms the captive gas.
11 Claims, 12 Drawing Sheets