Issued Patents All Time
Showing 26–29 of 29 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4306628 | Safety switch for well tools | James Adams | 1981-12-22 |
| 4273186 | Well safety valve system | Joseph L. Pearce, John H. Yonker | 1981-06-16 |
| 4214606 | Subsurface safety valve | Gary Allen Kohn | 1980-07-29 |
| 4201363 | Tubing retrievable surface controlled subsurface safety valve | Henry P. Arendt, Gary Allen Kohn | 1980-05-06 |