E21B 41/00
Equipment or details not covered by groups e21b15/00 - e21b40/00
Official title: Equipment or details not covered by groups E21B15/00 - E21B40/00
E21B41/00 (Equipment or details not covered by groups e21b15/00 - e21b40/00) appears on 7,026 US grants and 7,294 published applications in this corpus.
Search patents in E21B- Granted patents
- 7,026
- Published applications
- 7,294
- Assignees
- 1,911
- Inventors
- 12,865
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 31 | 0 |
| 1977 | 39 | 0 |
| 1978 | 32 | 0 |
| 1979 | 35 | 0 |
| 1980 | 31 | 0 |
| 1981 | 31 | 0 |
| 1982 | 32 | 0 |
| 1983 | 45 | 0 |
| 1984 | 63 | 0 |
| 1985 | 49 | 0 |
| 1986 | 47 | 0 |
| 1987 | 54 | 0 |
| 1988 | 53 | 0 |
| 1989 | 60 | 0 |
| 1990 | 32 | 0 |
| 1991 | 41 | 0 |
| 1992 | 55 | 0 |
| 1993 | 51 | 0 |
| 1994 | 50 | 0 |
| 1995 | 40 | 0 |
| 1996 | 45 | 0 |
| 1997 | 34 | 0 |
| 1998 | 42 | 0 |
| 1999 | 66 | 0 |
| 2000 | 85 | 0 |
| 2001 | 105 | 26 |
| 2002 | 77 | 171 |
| 2003 | 67 | 99 |
| 2004 | 129 | 123 |
| 2005 | 77 | 103 |
| 2006 | 93 | 92 |
| 2007 | 81 | 88 |
| 2008 | 63 | 121 |
| 2009 | 59 | 134 |
| 2010 | 90 | 168 |
| 2011 | 85 | 159 |
| 2012 | 110 | 203 |
| 2013 | 141 | 246 |
| 2014 | 170 | 263 |
| 2015 | 222 | 352 |
| 2016 | 240 | 417 |
| 2017 | 274 | 406 |
| 2018 | 270 | 497 |
| 2019 | 431 | 467 |
| 2020 | 493 | 519 |
| 2021 | 448 | 504 |
| 2022 | 494 | 478 |
| 2023 | 483 | 501 |
| 2024 | 458 | 485 |
| 2025 | 435 | 410 |
| 2026 | 288 | 262 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- E21B 41/005Waste disposal systems995
- E21B 41/0085Adaptations of electric power generating means for use in boreholes976
- E21B 41/0035Apparatus or methods for multilateral well technology841
- E21B 41/0007Equipment or details not covered by groups e21b15/00 - e21b40/00: for underwater649
- E21B 41/02In situ inhibition of corrosion in boreholes or wells604
- E21B 41/0078Nozzles used in boreholes386
- E21B 41/04Manipulators for underwater operations304
- E21B 41/0021Safety devices298
Recent patents
- Nuclear reactor integrated oil and gas production systems and methods of operation6 Oct 2026US 12,753,674 B2Natura Resources LLC
- Slidable isolation sleeve with I-shaped seal6 Oct 2026US 12,753,675 B2Halliburton Energy Services.Inc.
- Apparatus for injecting carbon dioxide into underground, method for evaluating same, and method for producing same6 Oct 2026US 12,753,676 B2Kyushu University, National University Corporation
- Assembly for generating electricity in a production well of a hot fluid6 Oct 2026US 12,753,677 B2Affin AS
- Shaft lubrication system6 Oct 2026US 12,753,877 B2K&L Technologies, Inc.
- Apparatus, system and method for tethering a subsea well assembly8 Oct 2026US 2026/0309005 A1Tla Subsea Ltd
- Processes and systems to capture carbon dioxide8 Oct 2026US 2026/0309006 A1Arelac, Inc.
- Method Of Abating Carbon Dioxide And Hydrogen Sulfide1 Oct 2026US 2026/0295509 A1Barnard College
- Providing selective dissolvable coatings on a multi-shell core system for inflow control devices1 Oct 2026US 2026/0297418 A1Saudi Arabian Oil Company
- Particulate compositions for iron sulfide remediation1 Oct 2026US 2026/0297419 A1ChampionX LLC
Most cited
By later US patents
- Mobile electric power generation for hydraulic fracturing of subsurface geological formations496US 9,534,473 B2Evolution Well Services, LLC · 2017
- Process for recovering methane and/or sequestering fluids405US 6,412,559 B1Alberta Research Council · 2002
- Method and apparatus for sealing the juncture between a vertical well and one or more horizontal wells using deformable sealing means361US 5,388,648 ABaker Hughes Incorporated · 1995
- Mobile, modular, electrically powered system for use in fracturing underground formations358US 9,103,193 B2Evolution Well Services, LLC · 2015
- Actively controlled rotary steerable system and method for drilling wells344US 6,092,610 ASchlumberger Technology Corporation · 2000