Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886114 | Electric surface controlled subsurface valve system | Donald H. Perkins, Thomas M. Deaton | 1989-12-12 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886114 | Electric surface controlled subsurface valve system | Donald H. Perkins, Thomas M. Deaton | 1989-12-12 |