John D. Duffy

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Peoria, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for controlling the actuation of a hydraulic c...
- Patent number 6,257,118
- Issue date Jul 10, 2001
- Caterpillar Inc.
- R. Carl Wilbur
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Apparatus and method for preventing underdigging of a work machine
- Patent number 6,131,061
- Issue date Oct 10, 2000
- Caterpillar Inc.
- Lee R. DenBraber
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Method and apparatus for controlling an implement of a work machine
- Patent number 5,737,993
- Issue date Apr 14, 1998
- Caterpillar Inc.
- Michael A. Cobo
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Method and apparatus for controlling an implement of a work machine
- Patent number 5,701,793
- Issue date Dec 30, 1997
- Catepillar Inc.
- Cynthia M. Gardner
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING