Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4269383 | Suction cup with lateral gripper | Donald J. Hackman, Harry Williams | 1981-05-26 |
| 4189268 | Diver-controlled underwater linear milling machine | Donald J. Hackman | 1980-02-19 |