Issued Patents 1994
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5297579 | Ball and seat-type check valve for downhole rod pump | Douglas A. Jensen | 1994-03-29 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5297579 | Ball and seat-type check valve for downhole rod pump | Douglas A. Jensen | 1994-03-29 |