| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 9 | |
| #2 | Canada | 2 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Clutches and brakes | |
| #2 | Unspecified technologies | |
| #3 | Gearing | |
| #4 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Charles Pitter Walter | 9 |
| #2 | Pitter Walter Charles | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US1870646A | Spring clutch device | |
| US1895678A | Clutch | |
| US1940880A | Spring clutch | |
| US1870645A | Rotary clutch mechanism | |
| US1873633A | Intermittent clutch | |
| US1870644A | Clutch mechanism | |
| US1937127A | Variable speed transmission device | |
| US1902375A | Clutch | |
| US1816295A | Speed changing gear and clutch therefor | |
| CA341164A | Clutch | |
| CA313293A | Variable speed transmission |