Patent 6487796 Issued on December 3, 2002. Estimated Expiration Date: January 2, 2021. 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.
The invention is an article of footwear having a sole comprised of one or more support elements formed of a resilient, compressible material. The support elements are designed such that impact forces generated by movements of a wearer deflect the support elements in a manner that produces a force directed to center the wearer's foot above the sole. The directed deflection characteristics of the support elements are due to a downward cant of the support elements' upper surfaces and flexion indentations that facilitate bending in one direction.
US 4,974,345, 12/1990, Yung-Mao (withdrawn
Article entitled "Hoop Dreams"
Web page translation using babelfish, entitled "The tennis shoe with the motivating force"
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