| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 3 | |
| #2 | EPO (European Patent Office) | 2 | |
| #3 | Australia | 1 | |
| #4 | Brazil | 1 | |
| #5 | Canada | 1 | |
| #6 | Denmark | 1 | |
| #7 | United Kingdom | 1 | |
| #8 | India | 1 | |
| #9 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones |
| # | Name | Total Patents |
|---|---|---|
| #1 | Strohbeen John | 12 |
| Publication | Filing date | Title |
|---|---|---|
| CA1276285C | Multidriver loudspeaker | |
| US4590333A | Multidriver loudspeaker | |
| US4483015A | Compensation network for loudspeakers | |
| US4440259A | Loudspeaker system for producing coherent sound |