Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5234968 | Thickening system for water-based building material mixes | Heinz-Josef Mann, Martin Ludke | 1993-08-10 |
| 4868461 | Thyristor triggering device | Bernd Bartscher | 1989-09-19 |
| 4401473 | Use of dimethylphosphinylalkanephosphonic acid as a setting retarder in gypsum | Hans-Jerg Kleiner, Volker Knittel | 1983-08-30 |
| 4329975 | Solid fuel stove utilizable as a fireplace | Erwin Hof, Gunter Herrmann | 1982-05-18 |
| 4265674 | Additive for concrete or mortar and the use thereof | Friedrich Girg, Volker Knittel | 1981-05-05 |