| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 3 | |
| #2 | Austria | 2 | |
| #3 | Canada | 2 | |
| #4 | United Kingdom | 2 | |
| #5 | France | 1 | |
| #6 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Clutches and brakes | |
| #2 | Vehicle transmission mounting | |
| #3 | Gearing |
| # | Name | Total Patents |
|---|---|---|
| #1 | Humfrey John Charles Willis | 2 |
| #2 | Willis Humfrey John Charles | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE538044C | One-way clutch with crooked rollers | |
| GB324792A | Improvements relating to clutch devices | |
| GB311252A | Improvements relating to speed changing devices for motor cars and the like | |
| US1788301A | Clutch for mechanically-propelled vehicles | |
| DE513443C | A coupling device connected to the drive shaft behind the gearbox of a motor vehicle and having two clutches effective in the forward and reverse directions | |
| DE496495C | Coupling device | |
| CA315262A | Free-wheel clutch with skew rollers | |
| CA299751A | Clutch mechanism |