| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 7 | |
| #2 | Canada | 4 | |
| #3 | United Kingdom | 4 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Machine tools | |
| #3 | Machines | |
| #4 | Consumer goods |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones | |
| #2 | Metal-working | |
| #3 | Sound-producing devices | |
| #4 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Jensen Peter L | 7 |
| #2 | Knowles Hugh S | 2 |
| #3 | Vincent Salmon | 1 |
| #4 | Salmon Vincent | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB574394A | Improvements in or relating to acoustic horns | |
| US2338262A | Acoustic horn | |
| GB461073A | Improvements in electro-dynamic sound reproducers | |
| US2295483A | Loudspeaker | |
| US1941477A | Method of making magnetic sound reproducers | |
| GB369818A | Improvements in loud speakers | |
| US2046515A | Sound reproducer | |
| US1941476A | Method of making sound reproducers | |
| US2014621A | Sound reproducer | |
| US1906379A | Electrodynamic sound reproducer | |
| CA336620A | Sound reproducer | |
| CA433071A | Loudspeaker | |
| CA346529A | Sound reproducer | |
| CA425328A | Acoustic horn |