| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Mechanical elements | |
| #3 | Basic communication technologies | |
| #4 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones | |
| #2 | Clutches and brakes | |
| #3 | Tuning resonant circuits | |
| #4 | Motor vehicles |
| # | Name | Total Patents |
|---|---|---|
| #1 | Rodger Glen Robert | 11 |
| #2 | Mcmurdo Silver | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2188655A | Loudspeaker and the like | |
| US2073474A | Loudspeaker and the like | |
| US2074173A | Loudspeaker and the like | |
| US2081743A | Centrifugal clutch | |
| US2065578A | Sound transmission | |
| US2049767A | Loudspeaker and the like | |
| US2071829A | Loudspeaker and like instrument | |
| US2049766A | Loudspeaker and like instrument | |
| US2074172A | Ship's signaling system | |
| US2062379A | Radio receiver | |
| US2022909A | Shaft coupling | |
| US2071828A | Loudspeaker, sound reproducing instrument, and the like |