| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 14 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Packaging and shipping |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Unspecified technologies | |
| #3 | Unspecified technologies | |
| #4 | Winches |
| # | Name | Total Patents |
|---|---|---|
| #1 | Wickersham Harry P | 14 |
| #2 | Erwin Burns | 6 |
| #3 | Craig Harley J | 2 |
| #4 | Tow James O | 2 |
| #5 | Roberts Gilbert V | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2094690A | Three string landing head | |
| US2079725A | Crown block | |
| US2020596A | Crown block | |
| US2039945A | Locked drilling safety joint | |
| US2039943A | Locked safety joint | |
| US2122827A | Tubing head | |
| US2012329A | Slip | |
| US2075248A | Spear | |
| US1914472A | Casing head | |
| US1833144A | Jar | |
| US1922225A | Control valve | |
| US1966809A | Control head | |
| US1930832A | Method and device for surveying wells | |
| US1533286A | Well-drilling bit |