Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5697442 | Apparatus and methods for use in cementing a casing string within a well bore | — | 1997-12-16 |
| 5236035 | Swivel cementing head with manifold assembly | David Paul Brisco, David D. McGuire | 1993-08-17 |
| 5095808 | Sequential remote control plug release system | — | 1992-03-17 |
| 5050673 | Lift through plug container for slant rig | — | 1991-09-24 |
| 5040603 | Sequential remote control plug release system | — | 1991-08-20 |
| 4995457 | Lift-through head and swivel | — | 1991-02-26 |
| 4917184 | Cement head and plug | T. Austin Freeman, David D. Szarka, Darrell Fontenot | 1990-04-17 |
| 4683955 | Automatic fill-up floating apparatus | Lee W. Stepp, Harold O. Treece | 1987-08-04 |
| 4624316 | Super seal valve with mechanically retained seal | Bob L. Sullaway | 1986-11-25 |
| 4320992 | Grout distribution system | Lloyd C. Knox, Bob L. Sullaway | 1982-03-23 |
| 4311414 | Pile wiper seal | — | 1982-01-19 |