Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5728190 | Melting furnace and process for the inertization of hazardous substances by vitrification | Helmut Pieper, Lothar Rott | 1998-03-17 |
| 5683484 | Method and apparatus for separating out gall during glass melting processes | Helmut Pieper, Lothar Rott | 1997-11-04 |
| 5032161 | Apparatus for melting asbestos-containing waste material in glass | Helmut Pieper, Hartmut Zschocher | 1991-07-16 |
| 5002600 | Conduit for molten glass | Helmut Sorg | 1991-03-26 |
| 4836841 | Roof for the working area, melting area or gob feeder of a glass melting furnace | Helmut Sorg | 1989-06-06 |