| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 10 | |
| #2 | Canada | 1 | |
| #3 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Optics | |
| #2 | Audio-visual technology | |
| #3 | Machines | |
| #4 | Consumer goods |
| # | Technology | |
|---|---|---|
| #1 | Photosensitive materials | |
| #2 | Special information storage | |
| #3 | Optical systems | |
| #4 | Producing goods from plastic | |
| #5 | Cameras | |
| #6 | Machines for artistic work |
| # | Name | Total Patents |
|---|---|---|
| #1 | Berthon Rodolphe | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB352248A | Improvements in or relating to the reproduction of optically recorded sound | |
| CA306137A | Process of lightening films |