Kinetic energy returning shoe
Patent 4858338 Issued on August 22, 1989. Estimated Expiration Date: 
May 18, 2008. 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.
May 18, 2008. 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 3835558 Insole and method of producing the same Thin, light-weight flexible orthopedic device Human shoe sole Orthotic for athletic use Footwear for physical exercise Orthotic for running Patent #: 4628621 InventorAssigneeApplicationNo. 07/195699 filed on 05/18/1988US Classes:36/44, Laminated36/102, Resilient or flexible shoe36/78WELTS AND RANDSExaminersPrimary: Watkins, DonaldAttorney, Agent or FirmInternational ClassA43B 13/18 (20060101)AbstractAn insert for a shoe sole is provided which includes a strip made of an elastic material disposed between an outer sole portion and an upper sole portion of the sole of a shoe. The strip extends from the outer heel area of the shoe to the border of the large toe area of the shoe. The strip forms a rocker bottom which cradles the first metatarsal head of the foot of the wearer. The roll point of the rocker bottom is disposed in a range of from the toe break of the wearer to approximately 2.5 centimeters behind the toe break of the wearer. | |
