Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5080881 | Method of preparing lower sodium polysulfides from higher sodium polysulfides and sodium | Friedrich Bittner, Walter Hinrichs, Ludwig Lange, Erich Splett | 1992-01-14 |
| 4857665 | Process for working up the filtration residue of crude sodium prepared by fusion electrolysis into a high-purity sodium alcholate | Walter Hinrichs, Ludwig Lange, Kurt A. Ruppert, Erich Splett | 1989-08-15 |
| 4767453 | Process for creating the flow properties to sodium-production filter residues | Walter Hinrichs, Ludwig Lange, Kurt A. Ruppert, Erich Splett | 1988-08-30 |
| 4640832 | Process for the production of sodium polysulfides from the elements sodium and sulfur | Friedrich Bittner, Walter Hinrichs, Ludwig Lange, Erich Splett | 1987-02-03 |