Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4894923 | Method and apparatus for measurement of azimuth of a borehole while drilling | Martin E. Cobern, Richard D. DiPersio | 1990-01-23 |
| 4761889 | Method for the detection and correction of magnetic interference in the surveying of boreholes | Martin E. Cobern, Frederick A. Stone | 1988-08-09 |
| 4207505 | Measuring system | Peter FALCK | 1980-06-10 |