| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 176 | |
| #2 | Canada | 2 | |
| #3 | United Kingdom | 2 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Machine tools | |
| #4 | Mechanical elements | |
| #5 | Packaging and shipping |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Unspecified technologies | |
| #3 | Percussive tools | |
| #4 | Lubricating | |
| #5 | Unspecified technologies | |
| #6 | Foundations and excavations | |
| #7 | Venting or aerating devices | |
| #8 | Making forged metal products | |
| #9 | Construction of roads | |
| #10 | Winches |
| # | Name | Total Patents |
|---|---|---|
| #1 | Curtis John C | 62 |
| #2 | Renfer John E | 20 |
| #3 | Albert Feucht | 19 |
| #4 | Richardson Led L | 18 |
| #5 | Greve Louis W | 16 |
| #6 | Nell Gustave M | 9 |
| #7 | Smith Jr William A | 9 |
| #8 | Richards Charles B | 8 |
| #9 | Slatcher Alfred G | 7 |
| #10 | Hafford Daniel J | 5 |
| Publication | Filing date | Title |
|---|---|---|
| US2321475A | Rock drill | |
| US2294541A | Rock drill support | |
| US2304646A | Brake control for slusher hoists | |
| US2291816A | Brake | |
| US2274698A | Drill steel centralizer | |
| US2291801A | Rock drill | |
| US2248824A | Rock drill rotation mechanism | |
| US2257889A | Feeding motor for rock drills | |
| US2210532A | Rock drill | |
| US2209491A | Valve for rock drills | |
| US2231302A | Valve for rock drills | |
| US2179162A | Mounting for rock drills | |
| US2210660A | Feeding mechanism for rock drills | |
| US2244127A | Drill steel centralizer | |
| US2213826A | Valve for rock drills | |
| US2221118A | Feeding mechanism for rock drills | |
| US2212329A | Rock drill | |
| US2203954A | Rock drill | |
| US2169887A | Valve for rock drills | |
| US2208025A | Supporting means for rock drills |