E21
Earth or rock drilling
Official title: Earth or rock drilling; mining
E21 (Earth or rock drilling) appears on 94,731 US grants and 82,222 published applications in this corpus.
Search patents in E21- Granted patents
- 94,731
- Published applications
- 82,222
- Assignees
- 15,097
- Inventors
- 93,921
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 981 | 0 |
| 1977 | 944 | 0 |
| 1978 | 1043 | 0 |
| 1979 | 698 | 0 |
| 1980 | 928 | 0 |
| 1981 | 1141 | 0 |
| 1982 | 873 | 0 |
| 1983 | 1018 | 0 |
| 1984 | 1320 | 0 |
| 1985 | 1214 | 0 |
| 1986 | 1150 | 0 |
| 1987 | 1313 | 0 |
| 1988 | 1002 | 0 |
| 1989 | 1183 | 0 |
| 1990 | 978 | 0 |
| 1991 | 1024 | 0 |
| 1992 | 1063 | 0 |
| 1993 | 1015 | 0 |
| 1994 | 1107 | 0 |
| 1995 | 915 | 0 |
| 1996 | 827 | 0 |
| 1997 | 721 | 0 |
| 1998 | 990 | 0 |
| 1999 | 1057 | 0 |
| 2000 | 1196 | 0 |
| 2001 | 1366 | 311 |
| 2002 | 1267 | 1243 |
| 2003 | 1230 | 1506 |
| 2004 | 1233 | 1826 |
| 2005 | 1063 | 1797 |
| 2006 | 1398 | 1736 |
| 2007 | 1293 | 1889 |
| 2008 | 1349 | 2247 |
| 2009 | 1291 | 2559 |
| 2010 | 1943 | 2937 |
| 2011 | 1793 | 3035 |
| 2012 | 2068 | 3203 |
| 2013 | 2356 | 3771 |
| 2014 | 2753 | 4331 |
| 2015 | 3174 | 4703 |
| 2016 | 3364 | 5024 |
| 2017 | 3756 | 4676 |
| 2018 | 4122 | 4704 |
| 2019 | 5008 | 4474 |
| 2020 | 4650 | 4375 |
| 2021 | 4297 | 4554 |
| 2022 | 4066 | 3965 |
| 2023 | 4022 | 3764 |
| 2024 | 3954 | 3846 |
| 2025 | 3715 | 3368 |
| 2026 | 2499 | 2378 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subclasses
Granted patents
Recent patents
- Direct high pressure slurry injection fracturing system and method6 Oct 2026US 12,752,247 B1
- Contaminant remediation with functionalized (meth)acrylic polymer or copolymer macroparticulates and systems related thereto6 Oct 2026US 12,753,257 B2Countertrace LLC
- Blend of polyarylether ketone copolymer6 Oct 2026US 12,753,305 B2Syensqo Specialty Polymers USA, LLC
- Method of improving injection pressure and asphaltene remediation6 Oct 2026US 12,753,337 B2
- Methods of treating unconsolidated sand formations using a red mud sealant composition6 Oct 2026US 12,753,339 B2Saudi Arabian Oil Company
- Drilling mud and method of making drilling mud having an unrefined petroleum product8 Oct 2026US 2026/0308439 A14 Oaks Solutions LLC
- Apparatus utilizing shape-memory and self-assembly to plug relatively wide remote fractures8 Oct 2026US 2026/0308440 A1The Penn State Research Foundation
- Formation Maintenance Fluids with Flowback Enhancers to Improve Wellbore Operations8 Oct 2026US 2026/0308442 A1Baker Hughes Oilfield Operations LLC
- Method and apparatus for confining the spread of pollutants spilled into a moving fluid8 Oct 2026US 2026/0308859 A1
- Virtual brake system8 Oct 2026US 2026/0308980 A1The Charles Machine Works, Inc.
Most cited
By later US patents
- Flexible drill pipe1,497US 4,328,839 ADrilling Development, Inc. · 1982
- Flexible drill pipe1,412US 4,600,037 ATexas Eastern Drilling Systems, Inc. · 1986
- Controlling hydrocarbon production609US 10,677,035 B2Saudi Arabian Oil Company · 2020
- Method of completing an uncased section of a borehole576US 5,366,012 AShell Oil Company · 1994
- Method and a plant for transport of hydrocarbons over a long distance from an offshore source of hydrocarbons555US 4,991,614 AKvaerner Engineering A.S. · 1991