David J. Rohrbaugh

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Oakland, MD, US

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Patents Grantslast 30 patents

Information Patent Grant
Hinged mine stopping
- Patent number 6,402,611
- Issue date Jun 11, 2002
- David J Rohrbaugh
- E21 - EARTH DRILLING MINING
Information Patent Grant
Diesel exhaust conditioning system
- Patent number 5,904,042
- Issue date May 18, 1999
- David Rohrbaugh
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Miniature, portable, self-contained power machine
- Patent number 5,647,721
- Issue date Jul 15, 1997
- David J. Rohrbaugh
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Miniature, portable, self-contained power machine
- Patent number 5,423,654
- Issue date Jun 13, 1995
- David J. Rohrbaugh
- B60 - VEHICLES IN GENERAL