David R. Hazen

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McMurray, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Support system for a unitized pair of auger conveyors
- Patent number 4,036,529
- Issue date Jul 19, 1977
- Continental Oil Company
- Arthur L. Hawthorne
- E21 - EARTH DRILLING MINING
Information Patent Grant
Wire communications channel for a pair of unitized augers
- Patent number 4,021,076
- Issue date May 3, 1977
- Consolidation Coal Company
- Arthur L. Hawthorne
- E21 - EARTH DRILLING MINING
Information Patent Grant
Apparatus for unitizing a pair of augers
- Patent number 4,015,674
- Issue date Apr 5, 1977
- Consolidation Coal Company
- Arthur L. Hawthorne
- E21 - EARTH DRILLING MINING