Issued Patents All Time
Showing 26–50 of 69 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5244423 | Turn prevention assembly for electrical connection lugs | James A. Erickson | 1993-09-14 |
| 5142056 | Retroviral protease inhibiting compounds | Dale J. Kempe, Daniel W. Norbeck | 1992-08-25 |
| 5041808 | Double load break switch and circuit | — | 1991-08-20 |
| 4785211 | Thermal expansion absorber | Samuel D. Fegan | 1988-11-15 |
| 4767233 | Impeller mounting apparatus | — | 1988-08-30 |
| 4674950 | Pitot tube for pitot type centrifugal pump | — | 1987-06-23 |
| 4591024 | Lube oil ring pump | — | 1986-05-27 |
| 4536046 | Pull out fusible switches | — | 1985-08-20 |
| 4449582 | Sequenced production incorporating fluid rod pump | Daniel G. Peterson, Horace M. Robinson | 1984-05-22 |
| 4436492 | Surface power unit for a downhole pump | Daniel G. Peterson | 1984-03-13 |
| 4425086 | Combined surface power unit and velocity actuated valve for a downhole pump | Daniel G. Peterson | 1984-01-10 |
| 4425083 | Velocity actuated valve for a downhole pump | Daniel G. Peterson | 1984-01-10 |
| 4381175 | Jet electric pump | — | 1983-04-26 |
| 4363063 | Load break switch with built-in ground fault sensing | — | 1982-12-07 |
| 4346256 | Conduit in supplying electrical power and pressurized fluid to a point in a subterranean well | Martin G. Hubbard | 1982-08-24 |
| 4333748 | Rotary gas/liquid separator | — | 1982-06-08 |
| 4332521 | High speed jet rotating casing apparatus | — | 1982-06-01 |
| 4322199 | High specific speed rotary chamber pump | — | 1982-03-30 |
| 4310288 | Method and apparatus for improving erosion resistance of the mixing chamber of a jet pump | — | 1982-01-12 |
| 4304410 | Sealing structure for reciprocating pistons exposed to high pressure differentials | Harold L. Petrie, F. Barton Brown, Herbert L. Johnson, III | 1981-12-08 |
| 4299352 | Centrifuge apparatus | — | 1981-11-10 |
| 4294573 | Submersible electrically powered centrifugal and jet pump assembly | Harold L. Petrie | 1981-10-13 |
| 4292011 | Turbo pump gas compressor | — | 1981-09-29 |
| 4289610 | Apparatus for pumping and conditioning drilling fluid | — | 1981-09-15 |
| 4286185 | Oil drying system for motors | — | 1981-08-25 |