Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6832564 | Method of operating a multiple hearth furnace | Patrick Hutmacher, Pascal Ferretti, Steve Arendt | 2004-12-21 |
| 6802710 | Multiple hearth furnace | Patrick Hutmacher, Jeannot Konsbruck, Edgar Kraemer | 2004-10-12 |
| 6792973 | Gas tight shut off valve for a material charging or discharging lock | Patrick Hutmacher | 2004-09-21 |