Issued Patents All Time
Showing 26–50 of 55 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6359569 | Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation | Clark E. Robison, Arthur Isadore Burke, Ian Phillips, Elbert Juan Smith, Tance Jackson | 2002-03-19 |
| 6343649 | Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation | Clark E. Robison, Arthur Isadore Burke, Ian Colin Phillips, Elbert Juan Smith, Alan Tancel Jackson | 2002-02-05 |
| 6199628 | Downhole force generator and method | Alan Tancel Jackson, Clark E. Robison, John J. Goiffon | 2001-03-13 |
| 5887652 | Method and apparatus for bottom-hole testing in open-hole wells | Roger L. Schultz | 1999-03-30 |
| 5826662 | Apparatus for testing and sampling open-hole oil and gas wells | Paul D. Ringgenberg, Roger L. Schultz, Rodney R. Setliff | 1998-10-27 |
| 5687791 | Method of well-testing by obtaining a non-flashing fluid sample | Roger L. Schultz | 1997-11-18 |
| 5375658 | Shut-in tools and method | Roger L. Schultz, Craig L. Zitterich, William L. Bohan | 1994-12-27 |
| 5335731 | Formation testing apparatus and method | Paul D. Ringgenberg | 1994-08-09 |
| 5332035 | Shut-in tools | Roger L. Schultz, Craig L. Zitterich, William L. Bohan | 1994-07-26 |
| 5279363 | Shut-in tools | Roger L. Schultz, Craig L. Zitterich, William L. Bohan | 1994-01-18 |
| 5240072 | Multiple sample annulus pressure responsive sampler | Roger L. Schultz | 1993-08-31 |
| 5236048 | Apparatus and method for communicating electrical signals in a well, including electrical coupling for electric circuits therein | Neal G. Skinner, Robert A. Moore, Gregory Albert Kliewer, Roger L. Schultz, Kevin R. Manke +1 more | 1993-08-17 |
| 5234057 | Shut-in tools | Roger L. Schultz, Craig L. Zitterich, William L. Bohan | 1993-08-10 |
| 5103906 | Hydraulic timer for downhole tool | Roger L. Schultz | 1992-04-14 |
| 4856585 | Tubing conveyed sampler | Kevin White | 1989-08-15 |
| 4756364 | Packer bypass | Jon B. Christensen, Vincent P. Zeller | 1988-07-12 |
| 4706746 | Downhole inflatable packer pump and testing apparatus | Kevin White | 1987-11-17 |
| 4693316 | Round mandrel slip joint | Paul D. Ringgenberg, Daniel Anderson Newman | 1987-09-15 |
| 4667743 | Low pressure responsive tester valve with ratchet | Paul D. Ringgenberg | 1987-05-26 |
| 4617999 | Downhole tool with compression chamber | — | 1986-10-21 |
| 4595060 | Downhole tool with compressible well fluid chamber | — | 1986-06-17 |
| 4557333 | Low pressure responsive downhole tool with cam actuated relief valve | — | 1985-12-10 |
| 4537258 | Low pressure responsive downhole tool | — | 1985-08-27 |
| 4515219 | Low pressure responsive downhole tool with floating shoe retarding means | — | 1985-05-07 |
| 4489786 | Low pressure responsive downhole tool with differential pressure holding means | — | 1984-12-25 |