| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 7 | |
| #2 | Austria | 2 | |
| #3 | United Kingdom | 2 | |
| #4 | Germany | 1 |
| # | Industry | |
|---|---|---|
| #1 | Materials and metallurgy | |
| #2 | Chemical engineering | |
| #3 | Electrical machinery and energy |
| # | Technology | |
|---|---|---|
| #1 | Non-metallic elements | |
| #2 | Separation | |
| #3 | Capacitors and switching devices |
| Publication | Filing date | Title |
|---|---|---|
| GB257917A | Improved manufacture of phosphorus or phosphoric acid and concurrently of activated charcoal | |
| DE488526C | Process for the simultaneous production of phosphorus and active carbon | |
| GB255871A | Improved manufacture of active carbon |