Footwear having improved shock absorption
Patent 4446634 Issued on May 8, 1984. Estimated Expiration Date: 
September 28, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 28, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1148376 3225463 3795994 Sneaker with insole Air cushion shoe base Thrust producing shoe sole and heel Patent #: 4358902 InventorsApplicationNo. 06/425437 filed on 09/28/1982US Classes:36/29, Pneumatic36/28, Cushion36/43INSOLESExaminersPrimary: Schroeder, Werner H.Assistant: Meyers, Steven N. Attorney, Agent or FirmInternational ClassesA43B 13/18 (20060101)A43B 13/20 (20060101) AbstractFootwear having improved shock absorption in a shoe having a heel and box portion, a first flat elastomeric bladder supported by the shoe heel portion to bear the weight of the heel of the foot of a user, an elastomeric bladder portion supported by the shoe box portion to bear the weight of the ball portion of the foot of a user, a conduit connecting the first and second bladders, and a valve in the conduit permitting a selectable rate of flow of fluid between the bladders. | |
