Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8932017 | Wind turbine torque limiting clutch system | David C. Heidenreich, Erik Leonard Olson, Gregg W. Cullings | 2015-01-13 |
| 8066619 | Clutch control system | Robert E. Herchick, David C. Heidenrcich, Erik Leonard Olson, Joseph W. Guinter, Arthur F. Gouker +1 more | 2011-11-29 |