Assignee
Inventors
- Richard Cotter (15 patents)
- Robert C. Johnson (76 patents)
- Michael D. Ward (41 patents)
- David C. Madsen (13 patents)
- Anthony J. Valicenti (1 patents)
- Michael P. Menard (1 patents)
- Hugh N. Tucker (9 patents)
US Patent 4920098 · Granted Apr 24, 1990