| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 35 | |
| #2 | Canada | 3 |
| # | Industry | |
|---|---|---|
| #1 | Consumer goods | |
| #2 | Machines | |
| #3 | Machine tools | |
| #4 | Mechanical elements | |
| #5 | Audio-visual technology | |
| #6 | Engines, pumps and turbines | |
| #7 | Furniture and games |
| # | Technology | |
|---|---|---|
| #1 | Laundering textiles | |
| #2 | Unspecified technologies | |
| #3 | Making gears or toothed racks | |
| #4 | Gearing | |
| #5 | Sawing | |
| #6 | Advertising | |
| #7 | Forging | |
| #8 | Making screws | |
| #9 | Special furniture | |
| #10 | Cylinders for combustion engines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Perkins Julian L | 38 |
| #2 | Croft Hiram D | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US2201242A | Wringer gear head structure | |
| US2175732A | Driving mechanism | |
| US2147921A | Wringer drive | |
| US2147920A | Transmission | |
| US2147919A | Machine for forming worms and the like | |
| US2133568A | Wringer head | |
| US2173660A | Gearing | |
| US2133567A | Wringer | |
| US2097532A | Wringer | |
| US2116363A | Drainboard | |
| US2101873A | Wringer head | |
| US2101872A | Wringer head | |
| US2127186A | Wringer head | |
| US2112997A | Wringer | |
| US2073974A | Wringer | |
| US2112996A | Machine for forming gears | |
| US2029385A | Machine tool | |
| US2133566A | Wringer | |
| US1906407A | Safety wringer | |
| US1906406A | Safety wringer |