Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4913466 | Inner pipe member for dual-wall drill pipe assembly | — | 1990-04-03 |
| 4718805 | Pipe handling apparatus | — | 1988-01-12 |
| 4618172 | Dual-wall drill pipe | — | 1986-10-21 |
| 4582146 | Earth drilling apparatus | — | 1986-04-15 |
| 4565394 | Dual-wall drill pipe | — | 1986-01-21 |
| 4385668 | Inner pipe support arrangement for double-walled drill pipe | Kare Asak | 1983-05-31 |
| 4371041 | Multi-purpose mobile drill rig | Richard R. Regimbal | 1983-02-01 |
| 4337563 | Method of assembling multiple wall drill pipe | Richard R. Regimbal | 1982-07-06 |
| 4274663 | Multiple wall drill pipe | Richard R. Regimbal | 1981-06-23 |