Assignee
Inventors
- Sydney Welt (19 patents)
- Gerd Ritter (60 patents)
- Leonard Cohen (6 patents)
- Clarence Williams, Jr. (3 patents)
- Elizabeth C. Richards (5 patents)
- Mary John (2 patents)
- Lloyd J. Old (135 patents)
US Patent 6190640 · Granted Feb 20, 2001