| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Brazil | 6 | |
| #2 | EPO (European Patent Office) | 6 | |
| #3 | Japan | 6 | |
| #4 | United States | 2 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology |
| # | Technology | |
|---|---|---|
| #1 | Special information storage |
| # | Name | Total Patents |
|---|---|---|
| #1 | Irwin Samuel N | 6 |
| #2 | Velazquez Juan F | 5 |
| #3 | Lum Francis | 5 |
| #4 | Mueller Joseph H | 5 |
| #5 | Dawson Ronald G | 3 |
| #6 | Jiyuan Efu Buerasukesu | 3 |
| #7 | Graham Bruce | 3 |
| #8 | Klumpp Marlin K | 2 |
| #9 | Butsch Otto R | 2 |
| #10 | Irwin Samuel | 2 |
| Publication | Filing date | Title |
|---|---|---|
| BR8203828A | Dual storage device integrated disk recording equipment perfecting in a disk recording equipment and tape boot mechanism | |
| BR8203829A | Positioning device for driving a braco pivot capture head and perfected control system for disc type impeller system | |
| US4468712A | Positioner apparatus for tape recorder heads | |
| US4462053A | Method for controlling a disc head |