Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5312459 | Additive for liquefied-gas fuels | Friedrich A. Sprugel | 1994-05-17 |
| 5160506 | Liquid fuel mixture, method for its production, and is use for two-stroke engines | Hans Schur, Friedrich A. Sprugel | 1992-11-03 |