Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4805540 | Center stub still railway tank car construction | William U. Casseau | 1989-02-21 |
| 4608931 | Filament wound railway hopper car | Douglas C. Ruhmann, Ralph A. Britton, Frederick E. Vorwerk | 1986-09-02 |
| 4498400 | Hopper slope sheet support and connecting means | Frederick E. Vorwerk | 1985-02-12 |
| 4497258 | Transverse bulkhead connection to filament wound vehicle body sides | Douglas C. Ruhmann, Frederick E. Vorwerk | 1985-02-05 |