| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Denmark | 6 | |
| #2 | Australia | 5 | |
| #3 | Norway | 5 | |
| #4 | Brazil | 4 | |
| #5 | German Democratic Republic | 4 | |
| #6 | EPO (European Patent Office) | 4 | |
| #7 | Spain | 4 | |
| #8 | Finland | 4 | |
| #9 | Greece | 4 | |
| #10 | Hungary | 4 | |
| #11 | Israel | 4 | |
| #12 | India | 4 | |
| #13 | Japan | 4 | |
| #14 | South Africa | 4 | |
| #15 | Yugoslavia (Serbia and Montenegro) | 3 | |
| #16 | Argentina | 1 | |
| #17 | Austria | 1 | |
| #18 | Canada | 1 | |
| #19 | Switzerland | 1 |
| # | Industry | |
|---|---|---|
| #1 | Basic materials chemistry | |
| #2 | Chemical engineering | |
| #3 | Thermal processes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Walder Rudolf | 26 |
| #2 | Ertel H J | 9 |
| #3 | Affolter J | 8 |
| #4 | Rudolf Walder | 6 |
| #5 | Walder R | 3 |
| #6 | Ruudorufu Buaruderu | 3 |
| #7 | Muller Walter | 2 |
| #8 | Affolter J Dr | 2 |
| #9 | Posch Oskar | 2 |
| #10 | Jiyan Afuoruteru | 1 |
| Publication | Filing date | Title |
|---|---|---|
| EP0209800A2 | Process for preparing electrically conducting carbon black with a poor ash content | |
| HUT48661A | Apparatus for producing black | |
| HUT48662A | Equipment for producing black | |
| HUT48663A | Equipment for producing black | |
| CH657072A5 | Method and housing for continuously cooling a hot gas flow. |