Duane J. Bonvallet

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Ann Arbor, MI, US

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Patents Grantslast 30 patents

Information Patent Grant
Clutch engageable damping and stiffening system
- Patent number 5,806,875
- Issue date Sep 15, 1998
- Marker Deutschland GmbH
- Duane J. Bonvallet
- A63 - SPORTS GAMES AMUSEMENTS
Information Patent Grant
Automatic damping/stiffening system
- Patent number 5,779,257
- Issue date Jul 14, 1998
- Marker Deutschland GmbH
- Duane J. Bonvallet
- A63 - SPORTS GAMES AMUSEMENTS
Information Patent Grant
Clutch engageable damping and stiffening system
- Patent number 5,681,054
- Issue date Oct 28, 1997
- Marker Deutschland GmbH
- Duane J. Bonvallet
- A63 - SPORTS GAMES AMUSEMENTS