Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7030064 | Bentonite nodules | Kieth A. Hejl | 2006-04-18 |
| 6820692 | Bentonite nodules | Kieth A. Hejl | 2004-11-23 |
| 5810085 | Drill hole plugging method utilizing sodium bentonite nodules | Melvyn C. James | 1998-09-22 |
| 5657822 | Drill hole plugging method utilizing layered sodium bentonite and liquid retaining particles | Melvyn C. James | 1997-08-19 |
| 5611400 | Drill hole plugging capsule | Melvyn C. James | 1997-03-18 |
| 4459652 | Phase-on ride-through control circuit | Michael Leach, Stephen John MacKay | 1984-07-10 |