Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4809262 | Method of making conference call connections in computer-controlled digital telephone exchanges | Reinhard Klose | 1989-02-28 |
| 4732685 | Method of liquid-liquid extraction using material exchange columns | Hans-Walter Brandt, Friedhelm Steffens, Johannes-Peter Schafer | 1988-03-22 |