Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4237935 | Hydraulic pressure relief valve and fluid isolator | Julian Delmonte, Douglas G. Ritchie | 1980-12-09 |
| D255938 | Transducer holder | David H. Hawke | 1980-07-15 |
| 4198989 | Transducer holder | David H. Hawke | 1980-04-22 |