Assignee
Inventors
- Ralph F. Osterhout (224 patents)
- John D. Haddick (150 patents)
- Robert Michael Lohse (111 patents)
- Charles Howard Cella (360 patents)
- Robert J. Nortrup (4 patents)
- Edward H. Nortrup (61 patents)
US Patent 10852540 · Granted Dec 1, 2020