| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 20 | |
| #2 | France | 8 | |
| #3 | Denmark | 4 | |
| #4 | Austria | 2 | |
| #5 | Switzerland | 2 |
| # | Industry | |
|---|---|---|
| #1 | Agriculture | |
| #2 | Chemical engineering | |
| #3 | Transport | |
| #4 | Environmental technology | |
| #5 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Planting | |
| #2 | Harvesting | |
| #3 | Separating solids | |
| #4 | Gearing | |
| #5 | Load transportation vehicles | |
| #6 | Climate change mitigation in goods production | |
| #7 | Motor vehicles | |
| #8 | Crop agriculture |
| # | Name | Total Patents |
|---|---|---|
| #1 | Dreyer Dipl-Ing Heinrich | 10 |
| #2 | Kahdemann Hans | 6 |
| #3 | Dreyer Amazonenwerk H | 1 |
| #4 | Heinrich Dreyer | 1 |
| #5 | Kreienbaum Hubert | 1 |
| #6 | Timmermann Willi | 1 |
| #7 | Dreyer Heinrich | 1 |
| #8 | Dreyer Erich | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE683166C | Trough fertilizer spreader |