| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 3 | |
| #2 | Australia | 2 | |
| #3 | Austria | 1 | |
| #4 | Belgium | 1 | |
| #5 | Canada | 1 | |
| #6 | German Democratic Republic | 1 | |
| #7 | Germany | 1 | |
| #8 | Denmark | 1 | |
| #9 | Spain | 1 | |
| #10 | United Kingdom | 1 | |
| #11 | Italy | 1 | |
| #12 | Japan | 1 | |
| #13 | Mexico | 1 | |
| #14 | Poland | 1 | |
| #15 | Romania | 1 | |
| #16 | Sweden | 1 | |
| #17 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Agriculture | |
| #2 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Agricultural harvest processing | |
| #2 | Harvesting | |
| #3 | Motor vehicles |
| # | Name | Total Patents |
|---|---|---|
| #1 | Witzel Homer D | 8 |
| #2 | Witzel Homer Daniel | 6 |
| #3 | Hoomaa Danieru Uitsuzeru | 1 |
| #4 | Witzel H D | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4895210A | Clutch-brake steering for small agricultural machines | |
| US4329833A | Self-propelled harvesting combine | |
| US4408618A | Axial flow rotary separator | |
| AU6299980A | Harvester | |
| AU6032580A | Axial flow rotary separator |