| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 31 | |
| #2 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Machines | |
| #3 | Mechanical elements | |
| #4 | Chemical engineering | |
| #5 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Non-positive-displacement pumps | |
| #2 | Unspecified technologies | |
| #3 | Pumps | |
| #4 | Pistons and sealings | |
| #5 | Lubricating | |
| #6 | Separation | |
| #7 | Siphons | |
| #8 | Ships | |
| #9 | Unspecified technologies | |
| #10 | Shafts |
| # | Name | Total Patents |
|---|---|---|
| #1 | Krogh Ferdinand W | 32 |
| #2 | Krogh Carl A | 4 |
| Publication | Filing date | Title |
|---|---|---|
| US1441589A | Centrifugal conveyer | |
| US1277430A | Centrifugal pump. | |
| US1243429A | Thrust-bearing. | |
| US1165183A | Davit-fall attachment. | |
| US1328234A | Sand-protecting device for turbine-pumps | |
| US1163243A | Turbine-pump. | |
| US1163242A | Centrifugal pump. | |
| US1187846A | Oiling device for shaft-bearings. | |
| US1146079A | Horizontal turbine-pump. | |
| US1159504A | Oiling device for vertical shafts. | |
| US1192791A | Removable deep-weel-pump cylinder. | |
| US1169266A | Deep-well pump. | |
| US1153321A | Balanced centrifugal pump. | |
| US1135296A | Turbine-pump. | |
| US1117861A | Centrifugal pump. | |
| US994937A | Air-seal. | |
| US977101A | Centrifugal pump. | |
| US1141556A | Centrifugal pump. | |
| US949681A | Deep-well pump. | |
| US927057A | Pump for deep wells. |