Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867236 | Compact casing tongs for use on top head drive earth drilling machine | Jerry K. Lingafelter | 1989-09-19 |
| 4842250 | Line reeving system for earth drilling machine | Clyde A. Willis | 1989-06-27 |
| 4830119 | Top head drive cooling system | Clyde A. Willis | 1989-05-16 |
| 4821814 | Top head drive assembly for earth drilling machine and components thereof | Clyde A. Willis | 1989-04-18 |
| 4815546 | Top head drive assembly with axially movable quill | Clyde A. Willis | 1989-03-28 |
| 4762187 | Internal wrench for a top head drive assembly | — | 1988-08-09 |
| 4650236 | Automatic pipe elevator | Clyde A. Willis | 1987-03-17 |
| 4533055 | Storage rack for drilling tubulars | — | 1985-08-06 |
| 4522439 | Automatic pipe elevator | — | 1985-06-11 |
| 4492501 | Platform positioning system | — | 1985-01-08 |
| 4475607 | Clamp and insert for clamping drilling tubulars | — | 1984-10-09 |