Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862804 | Implosion shaped charge perforator | Nicholas Collier, Steven D. Sehnert | 1989-09-05 |
| 4860654 | Implosion shaped charge perforator | William A. McPhee | 1989-08-29 |
| 4860655 | Implosion shaped charge perforator | — | 1989-08-29 |