| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 37 | |
| #2 | Canada | 4 |
| # | Industry | |
|---|---|---|
| #1 | Consumer goods | |
| #2 | Transport | |
| #3 | Electrical machinery and energy | |
| #4 | Control | |
| #5 | Engines, pumps and turbines | |
| #6 | Measurement | |
| #7 | Machines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Schwarze Carl J | 12 |
| #2 | Middleton Leslie H | 8 |
| #3 | Von Voigtlander Frederick | 6 |
| #4 | Stern Lewis J | 5 |
| #5 | Durant John D | 4 |
| #6 | Reck Peter C | 2 |
| #7 | Schwarze Carl Joseph | 2 |
| #8 | Dwight Sampson | 1 |
| #9 | Vasold Leo L | 1 |
| #10 | Saxon Herman R | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2325081A | Electric bell | |
| US2344523A | Electric bell | |
| US2285304A | Horn mounting | |
| US2284177A | Signal | |
| US2216380A | Electromagnetic horn | |
| US2126433A | Chime signal | |
| US2158209A | Sound signaling | |
| US2039694A | Diaphragm horn | |
| US2102201A | Thermostat | |
| US2064198A | Pressure gauge | |
| US2058067A | Condition disclosing apparatus | |
| US2074875A | Synthetic tone signal | |
| US2074895A | Indicator | |
| US2060911A | Sound signaling | |
| US2015279A | Defrosting | |
| US1993070A | Automobile control system | |
| US1936850A | Horn mounting | |
| US1875192A | Starter and re-starter for engines | |
| US2026095A | Starter for motor vehicles | |
| US1917141A | Defroster |