| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 10 | |
| #2 | Canada | 4 | |
| #3 | United Kingdom | 2 | |
| #4 | Austria | 1 | |
| #5 | Germany | 1 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Engines, pumps and turbines | |
| #3 | Audio-visual technology | |
| #4 | Telecommunications | |
| #5 | Measurement | |
| #6 | Transport |
| # | Name | Total Patents |
|---|---|---|
| #1 | Potter Donle Harold | 3 |
| #2 | Curtiss William R | 3 |
| #3 | Donle Harold P | 2 |
| #4 | Cadieux Joseph O | 1 |
| #5 | Hellmann Reinhard K | 1 |
| #6 | Hilliard Thomas William Nichol | 1 |
| #7 | George Keinath | 1 |
| #8 | Geremia Leo F | 1 |
| #9 | Thomas Philip J | 1 |
| #10 | Gottfried Wirrer | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2699469A | Telephone instrument | |
| US2640109A | Telephone instrument | |
| US2401356A | Recorder | |
| US2162528A | Switch mechanism | |
| US2097291A | Signal device | |
| US2098742A | Signal device | |
| US1550789A | Igniter | |
| GB201893A | Improvements in vacuum tube and system | |
| US1477869A | Electronic emission | |
| US1424809A | Electric switch | |
| DE376110C | Electron valve | |
| GB130965A | Improvements in Electron Valves. | |
| US1461339A | Ignition regulator for internal-combustion engines | |
| CA197146A | Radio communication | |
| CA290372A | Signal light | |
| CA318853A | Telephone instrument | |
| CA196146A | Electron valve |