Assignee
Inventors
- Michael G. Durrett (11 patents)
- David A. Helms (12 patents)
- Gregory J. Hatton (35 patents)
- Earl L. Dowty (6 patents)
- John D. Marrelli (31 patents)
- Joseph D. Stafford (9 patents)
- David J. Stavish (2 patents)
US Patent 4977377 · Granted Dec 11, 1990