| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 26 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Mechanical elements | |
| #3 | Machine tools | |
| #4 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Shafts | |
| #3 | Tools for connecting or disengaging | |
| #4 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | John Grant | 26 |
| Publication | Filing date | Title |
|---|---|---|
| US2238998A | Expansive reamer | |
| US2170452A | Expansible reamer | |
| US2170451A | Well reaming tool | |
| US2072859A | Wall scraper | |
| US2098494A | Apparatus for cleaning wells | |
| US2138375A | Well cleaning system | |
| US2029770A | Roller cutter reamer | |
| US2019047A | Hydraulic and spring operated expansive reamer | |
| US1938960A | Hydraulic expansion of underreamers | |
| US1801552A | Locking underreamer | |
| US1844357A | Rotary underreamer and cutter element therefor | |
| US1928833A | Casing head | |
| US1844356A | Reamer | |
| US1812044A | Expanding underreamer | |
| US1844355A | Swinging cutter reamer | |
| US1839787A | Cutter mounting for reamers | |
| US1773307A | Protected underreamer | |
| US1819367A | Expanding rotary reamer | |
| US1803669A | Compound expanding underreamer | |
| US1844354A | Expanding well reamer |