John D. Opfer

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Williamsville, NY, US

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Patents Grantslast 30 patents

Information Patent Grant
Athletic speed training device using biofeedback
- Patent number 9,033,855
- Issue date May 19, 2015
- John D. Opfer
- A63 - SPORTS GAMES AMUSEMENTS

Patents Applicationslast 30 patents

Information Patent Application
ATHLETIC SPEED TRAINING DEVICE USING BIOFEEDBACK
- Publication number 20140005014
- Publication date Jan 2, 2014
- John D. Opfer
- A63 - SPORTS GAMES AMUSEMENTS