| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 5 | |
| #2 | Canada | 1 | |
| #3 | Germany | 1 | |
| #4 | Denmark | 1 | |
| #5 | France | 1 | |
| #6 | United Kingdom | 1 | |
| #7 | Italy | 1 | |
| #8 | Japan | 1 | |
| #9 | Netherlands | 1 | |
| #10 | Norway | 1 |
| # | Industry | |
|---|---|---|
| #1 | Basic communication technologies | |
| #2 | Audio-visual technology | |
| #3 | Machines | |
| #4 | Consumer goods |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones | |
| #2 | Amplification control | |
| #3 | Amplifiers | |
| #4 | Unspecified technologies | |
| #5 | Electrophonic musical instruments | |
| #6 | Resonators |
| # | Name | Total Patents |
|---|---|---|
| #1 | Crooks Robert C | 4 |
| #2 | Crooks Robert Clement | 3 |
| #3 | Barcus Lester M | 1 |
| #4 | O'Brien Paul J | 1 |
| #5 | Crooks R C | 1 |
| #6 | Robaato Kuremento Kurutsukusu | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US5212336A | Planar wave transducer assembly | |
| US4496859A | Notch filter system | |
| US4482866A | Reference load amplifier correction system | |
| US4260954A | Amplifier load correction system | |
| US3935782A | End plug adapter |