Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4858431 | Apparatus for removing solid particles, especially soot particles, from the exhaust gas of an internal combustion engine | Rolf Leonhard | 1989-08-22 |
| 4858432 | Pilot burner for an apparatus for burning off solid particles in the exhaust gas of internal combustion engines | Alfred Knauer | 1989-08-22 |
| 4858433 | Pilot burner for an apparatus for burning off solid particles in the exhaust gas of internal combustion engines | Alfred Knauer, Rolf Leonhard, Wolfgang Stolper | 1989-08-22 |