Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6507790 | Acoustic monitor | — | 2003-01-14 |
| 5355983 | Electronically controlled rotational control apparatus | Richard G. Christensen | 1994-10-18 |
| 5242036 | Torque and/or rotational control apparatus | David R. Hennessy, James LeClaire, Richard G. Christensen | 1993-09-07 |
| 4510576 | Specific coefficient of performance measuring device | J. Ward MacArthur | 1985-04-09 |