Issued Patents All Time
Showing 1–25 of 39 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9937969 | Agricultural vehicle | Robert Obermeier-Hartmann, Hendrik Schulze Zumkley, Thomas Edward Schulte, David C. Janzen, Carolin Hammacher | 2018-04-10 |
| 9359021 | Configuration of a two-track tractor | David C. Janzen | 2016-06-07 |
| 8727047 | Configuration of a two-track tractor | David C. Janzen | 2014-05-20 |
| 8626408 | Row-producing system for agricultural crops | David C. Janzen | 2014-01-07 |
| 7628235 | Track roller unit | David Jansen | 2009-12-08 |
| 7354222 | Belted asphalt compactor | — | 2008-04-08 |
| 6681867 | Oscillating ground engaging tool | — | 2004-01-27 |
| 6618967 | Work machine control for improving cycle time | Michael I. Cline | 2003-09-16 |
| 6518913 | Apparatus and method for locating objects under a body of water | — | 2003-02-11 |
| 6213870 | Stall prevention system | — | 2001-04-10 |
| 5989142 | Planetary steering differential | — | 1999-11-23 |
| 5971082 | Hitch assembly with variable pivot point | — | 1999-10-26 |
| 5878569 | Energy conversion system | — | 1999-03-09 |
| 5863104 | Belt edge scraper | — | 1999-01-26 |
| 5857532 | Differential steer system for a machine | — | 1999-01-12 |
| 5803807 | Supporting system for a rotating concave grain threshing mechanism | — | 1998-09-08 |
| 5772503 | Crop feeding apparatus for rotating concave threshing mechanism | Dave C. Janzen, Edward E. Schmillen | 1998-06-30 |
| 5505274 | Suspension structure for a continuous track machine | — | 1996-04-09 |
| 5433515 | Guide rollers for flexible drive belt | Robert J. Purcell | 1995-07-18 |
| 5286044 | Belted multi-purpose trailer | Edward E. Schmillen | 1994-02-15 |
| 5191952 | Track-type vehicle having steerable wheels | Edward E. Schmillen | 1993-03-09 |
| 5127714 | Belt alignment mechanism for a belt driven vehicle | — | 1992-07-07 |
| 4893883 | Belt tension control system | — | 1990-01-16 |
| 4838373 | Suspension structure for a tracked vehicle | Robert J. Price, James E. Gee, Andrew J. Tonsor, Samuel B. Stevens | 1989-06-13 |
| 4781257 | Suspension structure for a tracked vehicle | James E. Gee, Andrew J. Tonsor, David E. Nelson | 1988-11-01 |