| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 6 | |
| #2 | United Kingdom | 5 | |
| #3 | France | 4 |
| # | Industry | |
|---|---|---|
| #1 | Optics | |
| #2 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Photosensitive materials | |
| #2 | Cameras | |
| #3 | Rotary-pistons | |
| #4 | Optical systems |
| # | Name | Total Patents |
|---|---|---|
| #1 | Brewster Percy Douglas | 4 |
| Publication | Filing date | Title |
|---|---|---|
| GB450673A | Improvements in or relating to motion picture cameras | |
| GB449749A | Improvements in or relating to combined sound and colour motion picture film and methods of making the same | |
| GB449750A | Improvements in or relating to colour cinematography | |
| GB449678A | Improvements in or relating to methods of removing latent abrasion marks from photographic emulsions |