| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 32 | |
| #2 | United Kingdom | 9 | |
| #3 | Germany | 6 | |
| #4 | Austria | 4 | |
| #5 | France | 3 | |
| #6 | Ireland | 2 | |
| #7 | Australia | 1 | |
| #8 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Machines | |
| #3 | Engines, pumps and turbines | |
| #4 | Machine tools | |
| #5 | Mechanical elements |
| # | Name | Total Patents |
|---|---|---|
| #1 | Williams Lewis W | 12 |
| #2 | Liddell Robert P F | 9 |
| #3 | Arnold George A | 7 |
| #4 | Irwine Robert L | 4 |
| #5 | Ward Marshall H | 2 |
| #6 | Layte Ralph R | 2 |
| #7 | Shaw William H | 1 |
| #8 | Robert Patterson Field Liddell | 1 |
| #9 | Mccoy Marion M | 1 |
| #10 | Kovacs Julius P | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB537063A | Improvements in or relating to machines for making metal filters | |
| US2271054A | Filter | |
| US2278603A | Filter | |
| US2213585A | Filter-forming machine | |
| US2226961A | Filter-unit forming machine | |
| GB527947A | Improvements in or relating to methods and machines for forming filter units of star-shaped configuration | |
| US2225813A | Filter | |
| US2239868A | Filter | |
| US2155973A | Filter forming machine | |
| US2196821A | Filter | |
| US2218226A | Filter | |
| GB505387A | Improvements in or relating to filters | |
| US2218800A | Filter | |
| US2201418A | Filter | |
| US2158512A | Filter | |
| US2186440A | Filtering unit and method of making the same | |
| US2133004A | Filter | |
| US2126938A | Filter | |
| US2100482A | Filter | |
| IE12257L | Filters |