Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4777878 | Exploding bridge wire detonator with shock reflector for oil well usage | James Johnson, James M. Barker | 1988-10-18 |
| 4767978 | Hybrid switching circuit in a DC to DC converter | — | 1988-08-30 |
| 4762067 | Downhole perforating method and apparatus using secondary explosive detonators | James M. Barker, Larry Grigar, Dennis E. Schramek, Cyril R. Sumner | 1988-08-09 |