Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5348107 | Pressure balanced inner chamber of a drilling head | Thomas F. Bailey, John E. Campbell | 1994-09-20 |
| 5305839 | Turbine pump ring for drilling heads | Manmohan S. Kalsi, Patricio D. Alvarez, Thomas F. Bailey | 1994-04-26 |