| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 11 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Civil engineering | |
| #3 | Machines | |
| #4 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Pumps | |
| #2 | Earth drilling | |
| #3 | Unspecified technologies | |
| #4 | Lubricating |
| # | Name | Total Patents |
|---|---|---|
| #1 | Neilsen Karl P | 11 |
| #2 | Byers Daniel E | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2628571A | Seat assembly for pump cages | |
| US2294568A | Ball valve cage | |
| US2206466A | Duplex pump | |
| US1717619A | Multiple-tube inserted pump | |
| US1757329A | Oil-well flow device | |
| US1676661A | Standing-valve puller | |
| US1628901A | Pump-plunger assembly | |
| US1628900A | Deep-well gas and oil separator | |
| US1703428A | Well heating and pumping system | |
| US1608114A | Oil pump | |
| US1649971A | Oil pump |