Assignee
Inventors
- Fritz Wagner (21 patents)
- Egbert Ristau (1 patents)
- Zu-yi Li (1 patents)
- Siegmund Lang (1 patents)
- Walther Schulz (9 patents)
- Hans-Jurgen Hofmann (2 patents)
- Kai-Udo Sewe (5 patents)
- Walter Lindorfer (13 patents)
US Patent 4720456 · Granted Jan 19, 1988