Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |