An athletic shoe which includes a timing device for measuring the amount of time the athletic shoe is off the ground and in air. The athletic shoe can also include a notification device which can be operatively coupled to the timing device for notifying a wearer of the athletic shoe of a message. The...http://www.google.fr/patents/US5343445?utm_source=gb-gplus-shareBrevet US5343445 - Athletic shoe with timing device
