| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 35 | |
| #2 | France | 16 | |
| #3 | Germany | 12 | |
| #4 | Sweden | 7 | |
| #5 | United States | 7 | |
| #6 | Australia | 6 | |
| #7 | Italy | 6 | |
| #8 | Japan | 5 | |
| #9 | South Africa | 5 | |
| #10 | Spain | 3 | |
| #11 | Belgium | 2 | |
| #12 | Switzerland | 2 | |
| #13 | Canada | 1 | |
| #14 | EPO (European Patent Office) | 1 | |
| #15 | Luxembourg | 1 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Engines, pumps and turbines | |
| #3 | Mechanical elements | |
| #4 | Machines | |
| #5 | Textiles and paper | |
| #6 | Machine tools |
| # | Name | Total Patents |
|---|---|---|
| #1 | Witchell Stanley Paul | 6 |
| #2 | Barker Clinton Brian | 4 |
| #3 | Adamson John Moffat | 4 |
| #4 | Wright Martin Edward John | 3 |
| #5 | Witchell S | 3 |
| #6 | Witchell S P | 3 |
| #7 | Taylor Peter Frank | 2 |
| #8 | Brooks Henry W | 2 |
| #9 | Kurinton Buraian Baakaa | 2 |
| #10 | Barrington Ross Bryan | 2 |
| Publication | Filing date | Title |
|---|---|---|
| GB2070971A | Air cleaner | |
| GB2070970A | Air cleaner | |
| GB2069866A | Air cleaner | |
| GB2070969A | Air cleaner | |
| GB2070682A | Silencer for the inlet to an air cleaner | |
| FR2441055A1 | Adjustable spanner for cartridge oil filter of automobile - has cooperating sliding reversed L=shaped jaws connected by rack and pinion mechanism | |
| GB2035868A | Torque tool with rack and pinion operated jaws | |
| EP0010954A1 | Improvements in or relating to gaskets | |
| GB2036199A | Gaskets | |
| GB2056307A | Air cleaner | |
| GB1604979A | Air filters | |
| GB1599686A | Pressure warning indicator | |
| GB1549200A | Gaskets | |
| GB1537264A | Cranes | |
| GB1525694A | Gaskets | |
| GB1517539A | Gaskets | |
| GB1547967A | Screen printing | |
| GB1454243A | Gasket manufacture | |
| ZA7501653B | Improvements in and relating to filtration apparatus | |
| GB1507673A | Filtration apparatus |