| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 5 | |
| #2 | Canada | 4 | |
| #3 | Switzerland | 3 | |
| #4 | Spain | 3 | |
| #5 | France | 3 | |
| #6 | United States | 3 | |
| #7 | Germany | 2 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Electrical machinery and energy |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones | |
| #2 | Special information storage | |
| #3 | Special electric heating or lighting |
| # | Name | Total Patents |
|---|---|---|
| #1 | Massolle Joseph | 6 |
| #2 | Vogt Hans | 5 |
| #3 | Joseph Massolle | 3 |
| #4 | Tri-Ergon A-G | 3 |
| #5 | Engl Josef | 3 |
| #6 | Massolle Joseph Ing | 2 |
| #7 | Engl Dr Josef | 2 |
| #8 | Massole Joseph Ing | 1 |
| #9 | Engl Josef Dr | 1 |
| #10 | Josef Engl | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1650166A | Light-modulating device | |
| US1582848A | Electrostatic telephone | |
| US1609760A | Electrostatic telephonic instrument for transmitting or receiving purposes | |
| DE430368C | Electrode arrangement for microphones with ionized gas line | |
| DE417967C | Device for the photographic recording of optical-acoustic processes and their reproduction by means of a constant light source | |
| CA264685A | Telephone instrument | |
| CA283946A | Optical acoustic apparatus | |
| CA259221A | Sound record | |
| CA250784A | Arrangement for the distortion free intensification of sounds and tones for the purpose of acoustic kinematography |