Assignee
Inventors
- Sigfrid Schwarz (15 patents)
- Walter Elger (109 patents)
- Hans-Joachim Siemann (3 patents)
- by Margit Lucas, heir (1 patents)
- by Frank Siemann, heir (1 patents)
- Gudrun Reddersen (9 patents)
- Birgitt Schneider (17 patents)
US Patent 6080735 · Granted Jun 27, 2000