Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |