Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4926938 | Rotatable liner hanger with multiple bearings and cones | — | 1990-05-22 |
| 4898243 | Liner and drill pipe assembly | Paul W. Cole | 1990-02-06 |
| 4880058 | Stage cementing valve | Richard Adams | 1989-11-14 |
| 4862966 | Liner hanger with collapsible ball valve seat | Roger P. Allwin, Richard Adams | 1989-09-05 |
| 4828037 | Liner hanger with retrievable ball valve seat | Roger P. Allwin, Richard Adams | 1989-05-09 |
| 4712615 | Liner hanger assembly with setting tool | Roy R. Dockins, Jr. | 1987-12-15 |
| 4671358 | Wiper plug cementing system and method of use thereof | Ray R. Dockins, Jr. | 1987-06-09 |
| 4603743 | Hydraulic/mechanical setting tool and liner hanger | — | 1986-08-05 |
| 4601343 | PBR with latching system for tubing | Roger P. Allwin, John M. Yokley | 1986-07-22 |
| RE31881 | Setting tools and liner hanger assembly | — | 1985-05-14 |
| 4498534 | Liner hanger assembly | — | 1985-02-12 |
| 4497371 | Setting tool and retrievable landing assembly | — | 1985-02-05 |
| 4399873 | Retrievable insert landing assembly | — | 1983-08-23 |
| 4287949 | Setting tools and liner hanger assembly | — | 1981-09-08 |
| 4281711 | Apparatus for positioning a liner on a tubular member in a well bore with a retrievable pack off bushing therebetween | Britt O. Braddick | 1981-08-04 |