| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Australia | 1 | |
| #2 | Canada | 1 | |
| #3 | Czechia | 1 | |
| #4 | EPO (European Patent Office) | 1 | |
| #5 | Israel | 1 | |
| #6 | Iceland | 1 | |
| #7 | Norway | 1 | |
| #8 | New Zealand | 1 | |
| #9 | Poland | 1 | |
| #10 | United States | 1 | |
| #11 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones |
| # | Name | Total Patents |
|---|---|---|
| #1 | Koeppen Karl Heinz | 6 |
| #2 | Koppen Detlef | 2 |
| #3 | Koeppen Karl-Heinz | 1 |
| #4 | Koeppen Detlef | 1 |
| Publication | Filing date | Title |
|---|---|---|
| NZ337842A | Broadband loudspeakers with diagonal rear deflection plate and enclosure shell being odd-sided polygon in section | |
| CZ327499A3 | Wideband loudspeaker |