Michael A. Brownstein

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San Antonio, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Baseball and softball bat swing training device
- Patent number 9,616,309
- Issue date Apr 11, 2017
- Michael A. Brownstein
- A63 - SPORTS GAMES AMUSEMENTS

Patents Applicationslast 30 patents

Information Patent Application
BASEBALL AND SOFTBALL BAT SWING TRAINING DEVICE
- Publication number 20150273302
- Publication date Oct 1, 2015
- Michael A. Brownstein
- A63 - SPORTS GAMES AMUSEMENTS