Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5474104 | Refueling check valve for compressed natural gas powered vehicles | Robin N. Borland, David E. Hughes, John Piscatelli, Paul Rafalowski, Timothy R. Stiffy +1 more | 1995-12-12 |
| 5125622 | Cylinder valve connection | David E. Hughes | 1992-06-30 |
| 4776562 | Dual piston pneumatically operated valve | David E. Hughes | 1988-10-11 |
| 4706929 | Pneumatically operated valve with manual override and lockout | David E. Hughes | 1987-11-17 |