Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D313378 | Railroad hopper car end slope collar casting | Kenneth Smith | 1991-01-01 |
| D311359 | Railroad hopper car cross ridge collar casting | Kenneth Smith | 1990-10-16 |
| 4884511 | Aluminum hopper car with cast collars interconnecting intersecting center sill hood with ridge hood and sloped end walls | Kenneth Smith | 1989-12-05 |
| 4843974 | Hopper car with automatic discharge door mechanism | John Alan Ritter | 1989-07-04 |
| 4829908 | Hopper car automatic discharge door mechanism with operating lever adjustable support | — | 1989-05-16 |
| 4766820 | Hopper car with automatic discharge door mechanism | John Alan Ritter | 1988-08-30 |
| 4377058 | Curved hopper car roof | Walter J. Marulic | 1983-03-22 |
| 4232793 | Car coupling arrangement for railway passenger cars | Dennis B. Marsden | 1980-11-11 |
| 4216725 | Combination door and emergency stairway exit | — | 1980-08-12 |