Hilbert D. Dahl

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Pittsburgh, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Slurry recovery from a circular sump
- Patent number 4,381,161
- Issue date Apr 26, 1983
- Conoco Inc.
- Richard E. Doerr
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Thrust actuated drill guidance device
- Patent number 4,305,474
- Issue date Dec 15, 1981
- Conoco Inc.
- Nathandale Farris
- E21 - EARTH DRILLING MINING