| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 5 | |
| #2 | Austria | 3 | |
| #3 | Denmark | 2 | |
| #4 | United Kingdom | 2 | |
| #5 | Switzerland | 1 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy |
| # | Technology | |
|---|---|---|
| #1 | Special electric heating or lighting | |
| #2 | Electric discharge tubes |
| Publication | Filing date | Title |
|---|---|---|
| GB191308712A | Improvements in or relating to Vacuum Light Tubes. | |
| GB191301218A | Improvements in or pertaining to Electric Vacuum-light Apparatus. |