| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 8 | |
| #2 | United States | 7 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Environmental technology | |
| #3 | Transport |
| # | Name | Total Patents |
|---|---|---|
| #1 | Della Riccia Angelo | 12 |
| #2 | Riccia Angelo Della | 3 |
| Publication | Filing date | Title |
|---|---|---|
| US1926668A | System for automatically controlling the speed of electric motors | |
| US1862427A | Pressure splitting device | |
| US1760777A | Electric installation in combination with pressure-splitting device | |
| US1697661A | Direct-electric-current-regulating transformer | |
| US1646066A | Transforming machine with symmetrically-subdivided flux for the control of traction motors or the like | |
| US1759759A | Direct-current pressure-splitting device |