Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4274432 | Valve | Karl N. Tunstall | 1981-06-23 |
| 4199131 | Actuator module for wireline cutting safety valve | Israel Boski, Karl N. Tunstall | 1980-04-22 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4274432 | Valve | Karl N. Tunstall | 1981-06-23 |
| 4199131 | Actuator module for wireline cutting safety valve | Israel Boski, Karl N. Tunstall | 1980-04-22 |