Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8418786 | Selectively powered ambulatory stretcher chair | Timothy A. Clapp, Richard E. Cole, Jr., Zackary D. McKee, Michael Maske | 2013-04-16 |
| 8066619 | Clutch control system | David C. Heidenrcich, Erik Leonard Olson, Joseph W. Guinter, David A. Peterman, Arthur F. Gouker +1 more | 2011-11-29 |
| 6874610 | Compact dry power takeoff unit | David C. Heidenreich | 2005-04-05 |
| 6557687 | Clutch assembly and diagnostic system | — | 2003-05-06 |
| 6305515 | Hydraulically actuated power takeoff clutch assembly | David C. Heidenreich, Joseph W. Guinter | 2001-10-23 |