| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 | |
| #2 | Germany | 1 | |
| #3 | France | 1 | |
| #4 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Machines | |
| #3 | Mechanical elements | |
| #4 | Packaging and shipping |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Siphons | |
| #3 | Pipe-line systems | |
| #4 | Pumps | |
| #5 | Steam traps | |
| #6 | Containers for goods storage | |
| #7 | Pipes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Engstrand Gunnar C | 7 |
| #2 | Drake Lewis F V | 1 |
| #3 | Parker Lester W | 1 |
| #4 | Roy Cross | 1 |
| #5 | Bengt Olsson | 1 |
| #6 | Cross Walter M | 1 |
| #7 | Wheeler Hervey J | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2148131A | Oil pumping method | |
| US2089691A | Method and apparatus for transporting viscous liquids | |
| US1873314A | Pumping apparatus | |
| US1883594A | Method and apparatus for transporting viscous liquids | |
| US1743762A | Oil-pumping apparatus | |
| US1737080A | Oil-pumping apparatus | |
| US1698127A | Air lift | |
| US1652968A | Oil-pumping apparatus | |
| US1736620A | Oil-pumping apparatus | |
| US1743761A | Apparatus for pumping viscous fluids | |
| US1712695A | Pumping apparatus | |
| US1712694A | Pumping apparatus |