| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 3 | |
| #2 | Spain | 3 | |
| #3 | Austria | 2 | |
| #4 | Denmark | 2 | |
| #5 | Canada | 1 | |
| #6 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Optics |
| # | Technology | |
|---|---|---|
| #1 | Cameras |
| # | Name | Total Patents |
|---|---|---|
| #1 | Troeger John Frederick Robert | 6 |
| #2 | Frederick Robert Troeger John | 3 |
| Publication | Filing date | Title |
|---|---|---|
| GB191512458A | Improvements in and relating to Translucent Screens for Projecting Machines. | |
| CA164949A | Screen for projecting machines |