Assignee
Inventors
- Richard M. Pihl (22 patents)
- Duane J. Hayes (5 patents)
- Loren L. Barber, Jr. (22 patents)
- Dennis G. Welygan (40 patents)
- R. Eugene Hardwick (4 patents)
- Ronald O. Zembke, deceased (1 patents)
US Patent 5443906 · Granted Aug 22, 1995