Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5551665 | Ball valve with coiled tubing cutting ability | Wesley R. Allred | 1996-09-03 |
| 5338001 | Valve apparatus | Craig W. Godfrey, Kenneth L. Schwendemann | 1994-08-16 |
| 5179973 | Valve with pressure assisted closing system | Rennie L. Dickson, Craig W. Godfrey, Kenneth L. Schwendemann | 1993-01-19 |
| 5050839 | Valve | Rennie L. Dickson, Craig W. Godfrey, Kenneth L. Schwendemann | 1991-09-24 |
| 4880060 | Valve control system | Kenneth L. Schwendemann | 1989-11-14 |
| 4702320 | Method and system for attaching and removing equipment from a wellhead | John C. Gano, Kenneth L. Schwendemann, Craig W. Godfrey | 1987-10-27 |
| 4522370 | Valve | Lester C. Rathie | 1985-06-11 |
| 4396061 | Locking mandrel for a well flow conductor | Jack W. Tamplen, Colby M. Ross, Jimmie R. Williamson, Jr. | 1983-08-02 |