| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 5 | |
| #2 | Argentina | 4 | |
| #3 | Australia | 4 | |
| #4 | Brazil | 4 | |
| #5 | Canada | 4 | |
| #6 | Denmark | 4 | |
| #7 | Spain | 4 | |
| #8 | Finland | 4 | |
| #9 | Ireland | 4 | |
| #10 | Japan | 4 | |
| #11 | Norway | 4 | |
| #12 | New Zealand | 4 | |
| #13 | South Africa | 4 | |
| #14 | Austria | 2 | |
| #15 | Belgium | 2 | |
| #16 | Switzerland | 2 | |
| #17 | German Democratic Republic | 2 | |
| #18 | Germany | 2 | |
| #19 | EPO (European Patent Office) | 2 | |
| #20 | France | 2 | |
| #21 | Hungary | 2 | |
| #22 | Israel | 2 | |
| #23 | Italy | 2 | |
| #24 | Luxembourg | 2 | |
| #25 | Netherlands | 2 | |
| #26 | Poland | 2 | |
| #27 | Portugal | 2 | |
| #28 | Sweden | 2 | |
| #29 | Yugoslavia (Serbia and Montenegro) | 2 | |
| #30 | Czechoslovakia | 1 | |
| #31 | Greece | 1 | |
| #32 | India | 1 | |
| #33 | Mexico | 1 | |
| #34 | USSR (Union of Socialist Soviet Republics) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Environmental technology | |
| #2 | Materials and metallurgy | |
| #3 | Machines | |
| #4 | Chemical engineering | |
| #5 | Basic materials chemistry |
| # | Name | Total Patents |
|---|---|---|
| #1 | Chappell Christopher Lee | 13 |
| #2 | Chappell Christopher L | 9 |
| #3 | Chappell C | 7 |
| #4 | Chappell C L | 7 |
| #5 | Wright David Richard | 5 |
| #6 | Robinson-Todd David William | 4 |
| #7 | Robinson Todd D | 3 |
| #8 | Chappel Christopher L | 2 |
| #9 | Wright David R | 2 |
| #10 | Wright D | 2 |
| Publication | Filing date | Title |
|---|---|---|
| ZA8007812B | Treatment of hazardous waste | |
| EP0013822A2 | Improvements in the treatment of hazardous waste | |
| IE782038L | Improvements relating to the treatment of hazardous waste | |
| US4116705A | Detoxification |