Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4762067 | Downhole perforating method and apparatus using secondary explosive detonators | James M. Barker, Larry Grigar, Starlin M. Reid, Cyril R. Sumner | 1988-08-09 |
| 4759291 | Through bulkhead explosive initiator for oil well usage | James M. Barker, Larry Grigar | 1988-07-26 |