Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5402858 | O-ring seal for rock bit bearings | Wayne Quantz, Michael Hooper, Madapusi K. Keshavan | 1995-04-04 |
| 5171139 | Moineau motor with conduits through the stator | Lance D. Underwood, Harold D. Johnson, Charles H. Dewey | 1992-12-15 |