Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8561708 | ID centralizer | Nicholas D. Johnson | 2013-10-22 |
| 8171997 | High velocity string for well pump and method for producing well fluid | Josh Prather, David B. Dillon, Ray A. Watson | 2012-05-08 |
| 8104534 | Mechanical seal and lock for tubing conveyed pump system | Josh Prather | 2012-01-31 |
| 7431095 | Non-tubing deployed well artificial lift system | Bruce Proctor, Doug Berry, Kelley L. Phillips | 2008-10-07 |
| 7306951 | Method and apparatus for determining diffusible hydrogen concentrations | David K. Benson, Thomas R. Wildeman, R. Davis Smith, II | 2007-12-11 |
| 6702027 | Gas dissipation chamber for through tubing conveyed ESP pumping systems | Steven K. Tetzlaff | 2004-03-09 |
| D478505 | Dispenser for sunblock towelettes | Michael E. Wondka | 2003-08-19 |
| 6592490 | Well pump gear box hydrodynamic washer | — | 2003-07-15 |
| 6412563 | System and method for enhanced conditioning of well fluids circulating in and around artificial lift assemblies | Albert David William St. Clair, Robert Timothy Dempsey, Steven K. Tetzlaff | 2002-07-02 |
| 6289990 | Production tubing shunt valve | David B. Dillon, Steven K. Tetzlaff | 2001-09-18 |
| 6036166 | Chamber valve | — | 2000-03-14 |
| 5988992 | Retrievable progressing cavity pump rotor | Steven K. Tetzlaff, David B. Dillon, Edward C. Kanady | 1999-11-23 |
| 5186521 | Wheel and drive key assembly | David A. Niespodziany, Ronald W. Schebel, Julie A. Wentland | 1993-02-16 |
| 4726854 | Cast iron welding electrodes | Alfredo D. Marquez | 1988-02-23 |
| 4640368 | Draft sensor including strain sensor coupled to load strap | Carl E. Kittle, Arthur J. LaFave | 1987-02-03 |
| 4534793 | Cast iron welding materials and method | Alfredo D. Marquez | 1985-08-13 |