Assignee
Inventors
- Helmut Schmidt (180 patents)
- Frank Hutter (9 patents)
- Karl-Heinz Haas (11 patents)
- Ernst Obermeier (4 patents)
- Ulrich Steger (1 patents)
- Hanns-Erik Endres (3 patents)
- Stephan Drost (1 patents)
US Patent 4878015 · Granted Oct 31, 1989