| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Mechanical elements | |
| #4 | Consumer goods |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Unspecified technologies | |
| #3 | Belts or cables for driving | |
| #4 | Venting or aerating devices | |
| #5 | Ropes | |
| #6 | Pipes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Shaffer William D | 12 |
| #2 | Humason Granville A | 1 |
| #3 | Schweitzer Frank J | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2260542A | High pressure flange packing | |
| US2096565A | Tubing head | |
| US2094682A | Combined well control gate and power drive | |
| US2060252A | Floating block gate ram | |
| US1900260A | Multicap casing head | |
| US1803732A | Jar mechanism for well drilling | |
| US1838503A | Control casing head | |
| US1963683A | Means for closing off flow between well casings and inside tubings | |
| US1698826A | Flow nipple | |
| US1925406A | Casing head for oil wells | |
| US1429371A | Rope socket | |
| US1384489A | Rope-socket |