Assignee
Inventors
- Ernst C. Schellhase (12 patents)
- Dan Anastas, deceased (1 patents)
- by Peggy Anastas, executrix (1 patents)
- Paul E. Keefer (1 patents)
- Cecil E. Covington (13 patents)
- Joseph John Zierer (13 patents)
- William D. Neathery (9 patents)
US Patent 5031858 · Granted Jul 16, 1991