| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 | |
| #2 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Surface technology and coating | |
| #4 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Unspecified technologies | |
| #3 | Electrolytic coating production | |
| #4 | Tools for connecting or disengaging |
| # | Name | Total Patents |
|---|---|---|
| #1 | Harry Pennington | 11 |
| #2 | Frenzel Wilbur G | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3006837A | Apparatus for electroplating metal cylinders equipped with ports | |
| US2620162A | Hammer type rotary rock-drilling bit | |
| US2611267A | Pressure gauge for sand formation testers | |
| US2145192A | Tube catcher sub | |
| US2145170A | Core barrel for oil well apparatus | |
| US2094022A | Retrieving sand tester | |
| US2115279A | Rotary | |
| US1925970A | Spinning tong | |
| GB342480A | Rotary rigs for drilling wells | |
| US2145191A | Retrieving core barrel | |
| US1892517A | Well drilling apparatus | |
| US1822710A | Rotary drilling rig | |
| US1741140A | Rotary rig |