Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5230387 | Downhole combination tool | Robert L. Waters, George F. Roberts, Howard C. Clark, Don D. Fitzgerald, Otis V. Stelly, II | 1993-07-27 |
| 5064006 | Downhole combination tool | Robert L. Waters, George F. Roberts, Howard C. Clark, Don D. Fitzgerald, Otis V. Stelly, II | 1991-11-12 |
| 4875014 | System and method for locating an underground probe having orthogonally oriented magnetometers | George F. Roberts | 1989-10-17 |
| 4709486 | Method of determining the orientation of a surveying instrument in a borehole | — | 1987-12-01 |