| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 15 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Unspecified technologies | |
| #3 | Venting or aerating devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Abercrombie James S | 15 |
| #2 | Cameron Harry S | 2 |
| #3 | King Walter E | 1 |
| #4 | Herbert Allen | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2316383A | System of reducing pressures | |
| US2194265A | Braden head and pipe hanger | |
| US2199215A | Stuffing box | |
| US2162990A | Drilling valve | |
| US1901854A | Whipstock | |
| US1888814A | Means for drilling wells | |
| US1910663A | Fluid pressure operated valve | |
| US1927863A | Whipstock for wells | |
| US1686945A | Weight-regulating device | |
| US1774911A | Anchor for wells | |
| US1834921A | Quick-operating blow-out preventer | |
| US1834922A | Fluid pressure operated blow-out preventer | |
| US1555811A | Fishing tool for wells | |
| US1569247A | Blow-out preventer | |
| US1502416A | Fishing tool |