Assignee
Inventors
- Ulrich Wirtz (25 patents)
- Helmuth Hensen (18 patents)
- Wolfgang Irmen (11 patents)
- Paul Surkamp (18 patents)
- Helmut Kohlen (18 patents)
- Dietmar Engelhardt (19 patents)
- Hans Grecksch (53 patents)
US Patent 5288030 · Granted Feb 22, 1994