| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 11 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Engines, pumps and turbines | |
| #3 | Measurement | |
| #4 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Separation | |
| #2 | Rotary-pistons | |
| #3 | Weighing | |
| #4 | Vehicle suspension arrangements |
| # | Name | Total Patents |
|---|---|---|
| #1 | Kraissl Jr Frederick | 11 |
| Publication | Filing date | Title |
|---|---|---|
| US3286843A | Self-cleaning filter | |
| US3348689A | Concentric filter elements having assembling and locking means | |
| US3347386A | Multiple element filter assembly | |
| US2982413A | Filter unit for liquids | |
| US2988009A | External gear pump | |
| US2890763A | Air filter sump and jet | |
| US2792118A | Strainers | |
| US2586964A | Rotary pump | |
| US2352269A | Strainer and filter | |
| US2275774A | Compression or vacuum machine | |
| US2144681A | Oil vapor filter |