| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 18 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Thermal processes | |
| #4 | Consumer goods |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Unspecified technologies | |
| #3 | Unspecified technologies | |
| #4 | Brushes | |
| #5 | Steam generation |
| # | Name | Total Patents |
|---|---|---|
| #1 | Pearce William L | 18 |
| Publication | Filing date | Title |
|---|---|---|
| US2799292A | Drill stem valve | |
| US2654578A | Earth formation disintegrating drill | |
| US2575831A | Drill pipe support | |
| US2580828A | Pipe holding slip | |
| US2496172A | Pipe holding slip | |
| US2200296A | Automatic boiler washer | |
| US2176358A | Drill | |
| US2119349A | Drill | |
| US2096132A | Drill | |
| US2022735A | Drill | |
| US2014909A | Drill | |
| US2011158A | Drill | |
| US2022734A | Drill | |
| US1945160A | Drill | |
| US1945159A | Drill | |
| US1910634A | Blow-out preventer | |
| US1876740A | Drill bit | |
| US880162A | Can-washer. |