| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 13 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Mechanical elements | |
| #3 | Packaging and shipping | |
| #4 | Machines | |
| #5 | Chemical engineering | |
| #6 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Shafts | |
| #3 | Unspecified technologies | |
| #4 | Winches | |
| #5 | Lifting and pushing | |
| #6 | Pipes | |
| #7 | Unspecified technologies | |
| #8 | Non-positive-displacement pumps | |
| #9 | Separation |
| # | Name | Total Patents |
|---|---|---|
| #1 | Johnston Horace G | 13 |
| Publication | Filing date | Title |
|---|---|---|
| US1902242A | Well drilling rotary | |
| US1465397A | Gas scrubber | |
| US1135808A | Rotary attachment. | |
| US1090066A | Impeller-pump. | |
| US1049866A | Thrust-bearing. | |
| US1017552A | Pipe-tongs. | |
| US959351A | Unscrewing mechanism for well-tubes. | |
| US979960A | Liner for steam-pumps. | |
| US929953A | Hydraulic swivel. | |
| US808378A | Automatic rotary hydraulic casing-spear. | |
| US804662A | Ball-bearing jack. | |
| US779285A | Well-sinking apparatus. | |
| US833462A | Hoisting mechanism. |