Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5682750 | Self-contained liquid natural gas filling station | Duane Preston, Michael Lutgen, Tom Drube, Paul Drube | 1997-11-04 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5682750 | Self-contained liquid natural gas filling station | Duane Preston, Michael Lutgen, Tom Drube, Paul Drube | 1997-11-04 |