Assignee
Inventors
- Leendert Vriens (30 patents)
- Johannes C. N. Rijpers (11 patents)
- Albert Comberg (10 patents)
- Johannes H. M. Wilting (1 patents)
- Aart A. Van Gorkum (13 patents)
- Franciscus A. Vollenbroek (4 patents)
US Patent 4990824 · Granted Feb 5, 1991