| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 13 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Engines, pumps and turbines | |
| #3 | Machines | |
| #4 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Pumps | |
| #3 | Unspecified technologies | |
| #4 | Venting or aerating devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ellsworth Gray | 13 |
| #2 | Mueller Robert A | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US1811047A | Packer | |
| US1762621A | Spear | |
| US1720672A | Pump | |
| US1833214A | Fluid lifting device for wells | |
| US1740770A | Back-pressure valve for drilling rigs | |
| US1700568A | Pump plunger | |
| US1573823A | Pump | |
| US1793547A | Check valve for drill stems | |
| US1559606A | Pump | |
| US1537165A | Pipe puller | |
| US1496985A | Combined fishing tool and packer for wells | |
| US1414511A | Spear | |
| US1337902A | Spear |