Energy return spring shoe construction
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 4, 1989
Grant Date -
N/A
app pub date -
Oct 13, 1987
filing date -
Oct 13, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An article of footwear with a spring device positioned in the heel portion of the article's midsole. The device is comprised of two, horizontal, rectangular, semi-elliptical shaped plates, with outwardly curving surfaces facing, joined at either end and having a plurality of springs positioned between the plates and joined to the plates at either end of the plates.
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Cited Art Landscape
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