Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881895 | Ceramic gas burner for a combustion chamber of a hot-blast stove | Jacob Felthuis | 1989-11-21 |
| 4863378 | Ceramic burner for a hot-blast stove | Jacob Felthuis | 1989-09-05 |
| 4852859 | Gastight bottom construction for a shaft furnace | Jacobus Van Laar, Frank Niemeijer | 1989-08-01 |