Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4734194 | Combined filter and valve mechanism | Andrew E. Kalman, Melvin C. Tyler, Thomas M. Boersma | 1988-03-29 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4734194 | Combined filter and valve mechanism | Andrew E. Kalman, Melvin C. Tyler, Thomas M. Boersma | 1988-03-29 |