Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5402928 | Method of making flute tube | Richard S. Preston, Steven W. Parkinson, Edwin Hinkley, Dale Cook | 1995-04-04 |
| 4231437 | Combined stabilizer and reamer for drilling well bores | Gerald S. Swersky | 1980-11-04 |