| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 21 | |
| #2 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Mechanical elements | |
| #3 | Machines | |
| #4 | Packaging and shipping | |
| #5 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Winches | |
| #3 | Gearing | |
| #4 | Unspecified technologies | |
| #5 | Unspecified technologies | |
| #6 | Cyclically operating valves | |
| #7 | Pipes | |
| #8 | Shafts | |
| #9 | Pumps |
| # | Name | Total Patents |
|---|---|---|
| #1 | Zilen Victor W | 6 |
| #2 | Harris Hu M | 5 |
| #3 | Vreeland Walter G | 3 |
| #4 | Jones Albert S | 2 |
| #5 | Attridge Oliver H | 2 |
| #6 | Harris Hugh M | 1 |
| #7 | Marvin Harris Hu | 1 |
| #8 | Petersen Sverre | 1 |
| #9 | Fair Ralph E | 1 |
| #10 | White Carl Jr | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1788141A | Brake equalizer | |
| GB260151A | Improvements in steam-engine valve gear | |
| US1622225A | Engine | |
| US1597360A | Band-brake equalizer | |
| US1628363A | Rotary-drilling machine | |
| US1586272A | Traveling block | |
| US1562644A | Casing pulley | |
| US1737793A | Hydraulic swivel | |
| US1544457A | Well-casing wrench | |
| US1479165A | Duplex-table rotary drilling machine | |
| US1475993A | Hydraulic swivel | |
| US1423550A | Crown block cable guard | |
| US1451770A | Bull and calf wheel | |
| US1440261A | Rotary drive mechanism | |
| US1428866A | Pumping apparatus | |
| US1460652A | Well elevator | |
| US1380513A | Well-casing wrench | |
| US1368779A | Elevator for casings or pipings | |
| US1280536A | Hydraulic swivel. | |
| US1276297A | Automatic finger-latch elevator. |