Article of footwear
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United States of America Patent
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Apr 13, 1999
Issued Date -
N/A
app pub date -
Aug 6, 1997
filing date -
Feb 8, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention is directed to an article of footwear including an upper, a sole and a pumping chamber for producing a continuous supply of fluid. The sole includes a midsole and an outsole. The pumping chamber is formed between the bottom surface of the midsole and the upper surface of the outsole and includes at least one inlet and at least one outlet. Movement of the wearer's foot causes fluid to be drawn into and expelled from the pumping chamber. The fluid produced by the pumping chamber may be used to inflate an expandable bladder or to provide ventilation to the wearer's foot.
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