Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4519457 | Oil well standing valve | Ronald A. Holland, John R. Brennan, Frederick C. Christ | 1985-05-28 |
| 4304410 | Sealing structure for reciprocating pistons exposed to high pressure differentials | John W. Erickson, F. Barton Brown, Herbert L. Johnson, III | 1981-12-08 |
| 4294573 | Submersible electrically powered centrifugal and jet pump assembly | John W. Erickson | 1981-10-13 |
| 4280662 | Erosion resistant jet pump and method of making same | John W. Erickson | 1981-07-28 |
| 4264285 | Downhole cleaner assembly for cleansing lubricant of downhole turbo-machines within wells | John W. Erickson | 1981-04-28 |