| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 20 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Electrical machinery and energy | |
| #3 | Telecommunications | |
| #4 | Basic communication technologies | |
| #5 | Machines | |
| #6 | Consumer goods |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones | |
| #2 | Electrically-conductive connections | |
| #3 | Unspecified technologies | |
| #4 | Travel equipment | |
| #5 | Transmission | |
| #6 | Amplifiers |
| # | Name | Total Patents |
|---|---|---|
| #1 | Lybarger Samuel F | 18 |
| #2 | Pelz Alfred E | 3 |
| Publication | Filing date | Title |
|---|---|---|
| US2552800A | Magnetic microphone | |
| US2524393A | Noise reducing hearing aid case | |
| US2530621A | Wearable hearing aid with inductive pick-up for telephone reception | |
| US2463786A | Electromagnetic mechanism for bone conduction receivers, etc. | |
| US2444302A | Hearing aid | |
| US2345761A | Hearing aid circuit | |
| US2326558A | Spring clip | |
| US2375010A | Audiphone receiver | |
| US2367726A | Sound transmitter | |
| US2257303A | Carbon cell | |
| US2221651A | Pin socket | |
| US2230500A | Bone conduction receiver | |
| US2224974A | Sound transmitter | |
| US2230499A | Bone conduction receiver | |
| US2143564A | Spring pin contactor | |
| US2112569A | Method and apparatus for selecting and prescribing audiphones | |
| US2145603A | Microphonic relay | |
| US1977830A | Microphonic relay assembly | |
| US1983178A | Earphone | |
| US1928669A | Transmitter |