Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5682750 | Self-contained liquid natural gas filling station | Duane Preston, Tom Drube, Paul Drube, Tom Chrisfield | 1997-11-04 |
| 4947651 | Pressure building circuit for a container for low temperature fluids | Timothy Neeser, Duane Preston | 1990-08-14 |