| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 22 | |
| #2 | France | 19 | |
| #3 | United Kingdom | 19 | |
| #4 | United States | 16 | |
| #5 | Switzerland | 8 | |
| #6 | Germany | 6 | |
| #7 | Austria | 5 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hopkins Marcus C | 34 |
| #2 | Hopkins Corporation | 8 |
| #3 | Bartsch Alfred H | 1 |
| #4 | High Jr John Meeker | 1 |
| #5 | High John M Jr | 1 |
| #6 | Gumaer Percy W | 1 |
| #7 | Hopkins Marcus Clarence | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB283212A | Loud speaker | |
| GB283211A | Loud speaker | |
| GB283210A | Loud speaker | |
| GB274847A | Loud speaker | |
| US1782094A | Electrical movement for loud-speakers | |
| US1763050A | Loud-speaker | |
| GB263480A | Loud speakers | |
| GB263477A | Loud speakers | |
| GB253080A | Telephone instrument | |
| GB263479A | Loud speakers | |
| US1763052A | Loud-speaker | |
| US1763049A | Loud-speaker | |
| US1763051A | Loud-speaker | |
| US1815945A | Loud speaker | |
| US1730508A | Loud-speaker | |
| US1763048A | Loud-speaker | |
| US1760647A | Electrical pick-up | |
| US1815944A | Loud speaker | |
| US1763056A | Sound-producing device | |
| GB236216A | Improved multiple unit loud speaker |