Assignee
Inventors
- Ulrich Conrad (19 patents)
- Guenter Kellermann (2 patents)
- Angela Breymayer (2 patents)
- Rolf Klinker (1 patents)
- Oswald Schuldt (1 patents)
- Rainer Hoffmann (28 patents)
- Frank Fabian (2 patents)
US Patent 4709548 · Granted Dec 1, 1987