Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5127661 | Fluid seal | David C. Franson, Wallace K. Snead | 1992-07-07 |
| 4640309 | Pilot operated poppet valve with speed control | Robert K. Hoffman, David C. Franson | 1987-02-03 |
| 4353290 | Pneumatic control valve and circuit | Robert K. Hoffman | 1982-10-12 |
| 4243072 | Three position selector valve | Robert K. Hoffman | 1981-01-06 |