Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861239 | High efficiency pump method and apparatus with hydraulic actuation | Eugene Darrell Simmons, Richard J. Reynaud | 1989-08-29 |
| 4616981 | Pumping apparatus with a down-hale spring loaded piston actuated by fluid pressure | Eugene Darrell Simmons, Richard J. Reynaud | 1986-10-14 |