Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873675 | Method and apparatus for seismic exploration of strata surrounding a borehole | Frederick J. Barr, Richard H. Piggin | 1989-10-10 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873675 | Method and apparatus for seismic exploration of strata surrounding a borehole | Frederick J. Barr, Richard H. Piggin | 1989-10-10 |