Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5404655 | Method and apparatus for regulating the sand discharge during the thermal regeneration of used foundry sand in fluidized bed kilns | Walter Stuzmann | 1995-04-11 |
| 5291935 | Process for the mechanical cleaning of foundry used sand | — | 1994-03-08 |
| 5289920 | Process for thermically recovering old sands obtained in casting plants and for treating the dusts obtained during circulation of the sand | Walter Stuzmann | 1994-03-01 |
| 4700766 | Process and apparatus for reclaiming foundry scrap sands | — | 1987-10-20 |