Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4979528 | Gas actuated valve system | Martin R. Asbra, Andrew F. Asbra | 1990-12-25 |
| 4920999 | Air actuated valve system with seismic controller | Martin R. Asbra, Andrew F. Asbra | 1990-05-01 |
| 4852600 | Air actuated valve system with seismic controller | Martin R. Asbra, Andrew F. Asbra, Charles W. Greer | 1989-08-01 |