Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10052958 | Overhead power grid for mobile mining machines | Joseph J. Zimmerman, Andrew W. Struthers | 2018-08-21 |
| 9623755 | Overhead power grid for mobile mining machines | Joseph J. Zimmerman, Andrew W. Struthers | 2017-04-18 |
| 9283866 | Overhead power grid for mobile mining machines | Joseph J. Zimmerman, Andrew W. Struthers | 2016-03-15 |
| 9056558 | Overhead power grid for mobile mining machines | Joseph J. Zimmerman, Andrew W. Struthers | 2015-06-16 |
| 8400342 | Explosion proof electro-mechanical joystick | Joseph J. Zimmerman | 2013-03-19 |
| 8235470 | Cutter head containing its motors and gearcase | Joseph J. Zimmerman | 2012-08-07 |