| # | Country | Total Patents | |
|---|---|---|---|
| #1 | WIPO (World Intellectual Property Organization) | 5 | |
| #2 | EPO (European Patent Office) | 4 | |
| #3 | United Kingdom | 3 | |
| #4 | United States | 2 | |
| #5 | Denmark | 1 | |
| #6 | Norway | 1 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Basic materials chemistry | |
| #3 | Engines, pumps and turbines | |
| #4 | Machines | |
| #5 | Materials and metallurgy | |
| #6 | Environmental technology |
| # | Name | Total Patents |
|---|---|---|
| #1 | Selsdon Leslie Donald | 16 |
| #2 | Lambert Stephen | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB0509666D0 | A building block | |
| EP0243346A1 | Filter. | |
| GB8431881D0 | Filter units | |
| GB8415138D0 | Oil filter system |