Issued Patents All Time
Showing 126–138 of 138 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5238070 | Differential actuating system for downhole tools | Roger L. Schultz, Kevin R. Manke | 1993-08-24 |
| 5236048 | Apparatus and method for communicating electrical signals in a well, including electrical coupling for electric circuits therein | Robert A. Moore, Gregory Albert Kliewer, Roger L. Schultz, Harold Kent Beck, Kevin R. Manke +1 more | 1993-08-17 |
| 5149984 | Electric power supply for use downhole | Roger L. Schultz, Kevin R. Manke, William L. Bohan, Allen R. Young | 1992-09-22 |
| 5101907 | Differential actuating system for downhole tools | Roger L. Schultz, Kevin R. Manke | 1992-04-07 |
| 5050681 | Hydraulic system for electronically controlled pressure activated downhole testing tool | — | 1991-09-24 |
| 4582136 | Method and apparatus for placement and retrieval of downhole gauges | — | 1986-04-15 |
| 4508174 | Downhole tool and method of using the same | David S. Wesson | 1985-04-02 |
| 4506731 | Apparatus for placement and retrieval of downhole gauges | — | 1985-03-26 |
| 4505993 | Battery housing | — | 1985-03-19 |
| 4426882 | Apparatus and method for sensing downhole conditions | — | 1984-01-24 |
| 4427063 | Retrievable bridge plug | — | 1984-01-24 |
| 4372388 | Subsurface control valve | — | 1983-02-08 |
| 4346761 | Hydra-jet slotting tool | Harry A. Braswell | 1982-08-31 |