Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4306844 | Vehicle fuel tank with internal fuel pump | Helmut Hoppmann | 1981-12-22 |
| 4212600 | Vehicle fuel tank having vented internal fuel pump | Helmut Hoppmann, Bodo Henning | 1980-07-15 |