| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 3 | |
| #2 | Canada | 2 | |
| #3 | Germany | 2 | |
| #4 | Netherlands | 2 | |
| #5 | United States | 2 | |
| #6 | Denmark | 1 | |
| #7 | France | 1 | |
| #8 | Norway | 1 | |
| #9 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Materials and metallurgy |
| # | Technology | |
|---|---|---|
| #1 | Separation | |
| #2 | Ammonia or cyanogen |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ethington Donald | 5 |
| #2 | Ethington D | 2 |
| #3 | Ethington Donald Albert | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4219534A | Method for removing nitrogen oxides from a gas stream | |
| CA1088728A | Method and apparatus for removing nitrogen oxides from a gas stream | |
| CA1050735A | Method of removing nitrogen oxides from a gas stream |