| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 16 | |
| #2 | Canada | 2 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Chemical engineering | |
| #3 | Machines | |
| #4 | Basic materials chemistry | |
| #5 | Thermal processes | |
| #6 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Sewers | |
| #2 | Separation | |
| #3 | Unspecified technologies | |
| #4 | Air-conditioning | |
| #5 | Venting or aerating devices | |
| #6 | Water-closets with flushing devices | |
| #7 | Roof coverings | |
| #8 | Domestic plumbing installations | |
| #9 | Refining |
| # | Name | Total Patents |
|---|---|---|
| #1 | Dehn George J | 18 |
| Publication | Filing date | Title |
|---|---|---|
| US2181263A | Grease separator | |
| US2003140A | Grease trap | |
| US1977305A | Grease trap | |
| US2057883A | Grease trap | |
| US2003139A | Grease trap | |
| US1281147A | Trap. | |
| US1203989A | Pipe-fitting. | |
| US1123705A | Floor-drain. | |
| US1109740A | Combined floor-drain and hopper. | |
| US1120697A | Pipe connection. | |
| US1071889A | Grease-trap. | |
| US1139647A | Drain. | |
| US1174234A | Drain-trap. | |
| US1046741A | Drain-trap. | |
| US912823A | Cap for vent-pipes. | |
| US935000A | Floor-drain. | |
| CA58681A | Apparatus for cleaning water heaters | |
| CA355711A | Grease trap |