| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 4 | |
| #2 | Japan | 4 | |
| #3 | United States | 4 | |
| #4 | Canada | 3 | |
| #5 | France | 3 | |
| #6 | United Kingdom | 3 | |
| #7 | Netherlands | 3 | |
| #8 | Belgium | 2 | |
| #9 | Italy | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Machines | |
| #3 | Consumer goods | |
| #4 | Electrical machinery and energy | |
| #5 | Basic communication technologies | |
| #6 | Organic fine chemistry | |
| #7 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones | |
| #2 | Sound-producing devices | |
| #3 | Unspecified technologies | |
| #4 | Electrically-conductive connections | |
| #5 | Amplifiers | |
| #6 | Heterocyclic compounds | |
| #7 | Nails |
| # | Name | Total Patents |
|---|---|---|
| #1 | Durbin Howard M | 3 |
| #2 | Johnson Paul D | 3 |
| #3 | Keele D Broadus Jr | 2 |
| #4 | Hawaado Emu Daabin | 2 |
| #5 | Keele Jun D Broadus | 1 |
| #6 | Keele Broadus D Jr | 1 |
| #7 | Durbin H M | 1 |
| #8 | Locanthi Bart N | 1 |
| #9 | Dei Buroodousu Keere Jiyunia | 1 |
| #10 | Keele D B | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB2075809A | Loudspeaker horn | |
| US4324312A | Diaphragm suspension construction | |
| JPS5567297A | Suspending device for acoustic diaphragm | |
| US4039243A | Electrical connector | |
| US3428908A | Multi-stage,direct-coupled transistor amplifier having complementary symmetry | |
| US3145037A | Spring fastener |