Assignee
Inventors
- Joseph J. Hammel (8 patents)
- Walter J. Robertson (13 patents)
- William P. Marshall (5 patents)
- Herbert W. Barch (13 patents)
- Balbhadra Daas (1 patents)
- Michael A. Smoot (5 patents)
- Richard P. Beaver (9 patents)
US Patent 4842620 · Granted Jun 27, 1989