Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889184 | Polished rod stuffing box with safety valve for a beam pumped production well | Lubbertus Lugtmeier | 1989-12-26 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889184 | Polished rod stuffing box with safety valve for a beam pumped production well | Lubbertus Lugtmeier | 1989-12-26 |