Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4509966 | Wall-flow monolith filter with porous plugs | David L. Dimick, Otto A. Ludecke | 1985-04-09 |
| 4478618 | Diesel exhaust particulate trap with plural filter tubes | Edward J. Chmiel, Ernest T. Martyniuk | 1984-10-23 |
| 4462812 | Ceramic monolith particulate trap including filter support | Terrance L. Stark, Otto A. Ludecke | 1984-07-31 |
| 4455823 | Diesel exhaust particulate trap with pleated filter | Otto A. Ludecke, Richard H. Smith | 1984-06-26 |
| 4276066 | Monolith diesel exhaust filter with self-regeneration | Mark J. Gutwald, Otto A. Ludecke | 1981-06-30 |