Issued Patents All Time
Showing 1–22 of 22 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5297833 | Apparatus for gripping a down hole tubular for support and rotation | Clyde D. Durrett | 1994-03-29 |
| 5294228 | Automatic sequencing system for earth drilling machine | Jerry K. Lingafelter | 1994-03-15 |
| 5273388 | Lifting device for down hole tubulars | Gary T. Oatman | 1993-12-28 |
| 5259723 | Feeding device for down hole tubulars | Gary T. Oatman | 1993-11-09 |
| 5036927 | Apparatus for gripping a down hole tubular for rotation | — | 1991-08-06 |
| 4842250 | Line reeving system for earth drilling machine | Keith M. Haney | 1989-06-27 |
| 4830119 | Top head drive cooling system | Keith M. Haney | 1989-05-16 |
| 4821814 | Top head drive assembly for earth drilling machine and components thereof | Keith M. Haney | 1989-04-18 |
| 4821816 | Method of assembling a modular drilling machine | — | 1989-04-18 |
| 4815546 | Top head drive assembly with axially movable quill | Keith M. Haney | 1989-03-28 |
| 4759414 | Modular drilling machine and components thereof | — | 1988-07-26 |
| 4650236 | Automatic pipe elevator | Keith M. Haney | 1987-03-17 |
| 4511169 | Self locking and unlocking elevator assembly | — | 1985-04-16 |
| 4509606 | Axial return hammer | — | 1985-04-09 |
| 4407373 | Collapsible pedestal for drilling apparatus | Jerry K. Lingafelter | 1983-10-04 |
| 4407629 | Lifting apparatus for down-hole tubulars | — | 1983-10-04 |
| 4403897 | Self-centering clamp for down-hole tubulars | — | 1983-09-13 |
| 4403666 | Self centering tongs and transfer arm for drilling apparatus | — | 1983-09-13 |
| 4366606 | Self-centering clamp for down-hole tubulars | Jerry K. Lingafelter | 1983-01-04 |
| 4314611 | Apparatus for supporting and rotating a down hole tubular | — | 1982-02-09 |
| 4280535 | Inner tube assembly for dual conduit drill pipe | — | 1981-07-28 |
| 4274497 | Skirted hammer sub for dual tube drilling | George Ford | 1981-06-23 |