| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Netherlands | 4 | |
| #2 | Germany | 3 | |
| #3 | France | 3 | |
| #4 | United Kingdom | 3 | |
| #5 | Japan | 2 | |
| #6 | United States | 2 | |
| #7 | Switzerland | 1 | |
| #8 | Italy | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology |
| # | Technology | |
|---|---|---|
| #1 | Television | |
| #2 | Special information storage |
| # | Name | Total Patents |
|---|---|---|
| #1 | Preuss Heinz | 8 |
| #2 | Haintsu Puroisu | 2 |
| Publication | Filing date | Title |
|---|---|---|
| DE2949813A1 | DEVICE FOR RECORDING IMAGE AND SOUND INFORMATION PRESENT IN ELECTRICAL SIGNALS ON AN IMAGE DISK | |
| DE2652935A1 | METHOD AND ARRANGEMENT FOR IMAGE FREQUENCY CONVERSION | |
| DE2652936A1 | AUDIOVISUAL DISPLAY DEVICE | |
| NL177451B | Apparatus for reading and displaying image and sound information recorded in an optically readable form on a disc-shaped record carrier. |