Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5048605 | Packing-seal for boreholes | Donald A. Toon, Douglas J. Belshaw, John A. Cherry, Paul E. Johnson | 1991-09-17 |
| 4902976 | Probe for detecting the presence of magnetic material in a ground hole | Douglas J. Belshaw, Donald A. Toon | 1990-02-20 |