Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5035735 | Process for vitrifying environmentally hazardous waste material in a glass melting furnace | Helmut Pieper, Helmut Sorg | 1991-07-30 |
| 5032161 | Apparatus for melting asbestos-containing waste material in glass | Helmut Pieper, Matjaz Bucar | 1991-07-16 |
| 4948411 | Glass melting furnace for glazing environmentally hazardous wastes | Helmut Pieper, Helmut Sorg | 1990-08-14 |
| 4944785 | Process using melt accelerator for the conversion of solid waste substances into glass | Helmut Sorg, Helmut Pieper, Heinz Merlet | 1990-07-31 |