Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6021966 | Process and apparatus for simultaneously grinding and drying a material to be ground containing moist cellulose ether | Reinhard Doenges, Manfred Sponheimer, Guenther Welt | 2000-02-08 |
| 5921479 | Process and apparatus for simultaneously grinding and drying material to be ground containing moist cellulose ether | Reinhard Doenges, Manfred Sponheimer, Guenther Welt | 1999-07-13 |
| 5589589 | Process for screening cellulose ethers | Manfred Sponheimer, Guenther Welt | 1996-12-31 |
| 4985152 | Process for separating solvents used in the purification of products | Josef Hilbig, Guenther Welt | 1991-01-15 |
| 4979681 | Process for grinding and simultaneous drying of moist cellulose ether products | Reinhard Donges, Manfred Sponheimer, Gunther Welt | 1990-12-25 |
| 4794166 | Process for the preparation of a hydrogel which is largely free from monomers | Friedrich Engelhardt, Manfred Schrod, Josef Hilbig, Reinhard Donges | 1988-12-27 |