Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6213261 | Hydropneumatic spring | — | 2001-04-10 |
| 5135798 | Multilayer, flexible transfer strip | Sigo Muschter, Petra Bubolz, Wolfhard Rutz | 1992-08-04 |
| 4891260 | Multilayer flexible transfer ribbon | Petra Bubolz, Wolfhard Rutz, Sigo Muschter | 1990-01-02 |
| 4871620 | Typewriter ribbon having a thin support and a transferable mass, for typing on varied surfaces | Wolfhard Rutz | 1989-10-03 |