| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Denmark | 6 | |
| #2 | United Kingdom | 5 | |
| #3 | Germany | 3 | |
| #4 | United States | 2 | |
| #5 | Switzerland | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones | |
| #2 | Casings and printed circuits |
| # | Name | Total Patents |
|---|---|---|
| #1 | Rosenstand Gerd | 3 |
| #2 | Gerd Rosenstand | 3 |
| #3 | Pallesen Hugo Bang | 1 |
| #4 | Manfred Parthum Werner | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB1113940A | Microphone for use in hearing aids or other devices | |
| GB1111887A | Hearing aid circuit module | |
| GB1119445A | Hearing aid | |
| GB1119446A | Hearing aid ear inserts for placing in the auditory canal |