Donald H. Parkes

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Lamoni, IA, US

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Patents Grantslast 30 patents

Information Patent Grant
Variable force traction enhance systems
- Patent number 5,784,867
- Issue date Jul 28, 1998
- Shivvers Incorporated
- Douglas McFarland
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Force neutralizing mechanism for a single lever control
- Patent number 5,279,376
- Issue date Jan 18, 1994
- Shivvers, Incorporated
- Xinzhan Yang
- G05 - CONTROLLING REGULATING
Information Patent Grant
Single lever control
- Patent number 5,131,483
- Issue date Jul 21, 1992
- Shivvers, Inc.
- Donald H. Parkes
- G05 - CONTROLLING REGULATING