E21B 23/004
Indexing systems for guiding relative movement between telescoping parts of downhole tools
Official title: {Indexing systems for guiding relative movement between telescoping parts of downhole tools}
E21B23/004 (Indexing systems for guiding relative movement between telescoping parts of downhole tools) appears on 792 US grants and 540 published applications in this corpus.
Search patents in E21B- Granted patents
- 792
- Published applications
- 540
- Assignees
- 223
- Inventors
- 1,079
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 6 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 16 | 0 |
| 1982 | 13 | 0 |
| 1983 | 11 | 0 |
| 1984 | 7 | 0 |
| 1985 | 10 | 0 |
| 1986 | 6 | 0 |
| 1987 | 22 | 0 |
| 1988 | 10 | 0 |
| 1989 | 12 | 0 |
| 1990 | 20 | 0 |
| 1991 | 11 | 0 |
| 1992 | 9 | 0 |
| 1993 | 13 | 0 |
| 1994 | 16 | 0 |
| 1995 | 13 | 0 |
| 1996 | 14 | 0 |
| 1997 | 9 | 0 |
| 1998 | 13 | 0 |
| 1999 | 14 | 0 |
| 2000 | 14 | 0 |
| 2001 | 14 | 5 |
| 2002 | 17 | 17 |
| 2003 | 15 | 5 |
| 2004 | 9 | 19 |
| 2005 | 11 | 17 |
| 2006 | 7 | 9 |
| 2007 | 9 | 25 |
| 2008 | 22 | 13 |
| 2009 | 13 | 20 |
| 2010 | 15 | 19 |
| 2011 | 21 | 26 |
| 2012 | 19 | 18 |
| 2013 | 24 | 32 |
| 2014 | 19 | 28 |
| 2015 | 27 | 29 |
| 2016 | 34 | 44 |
| 2017 | 28 | 35 |
| 2018 | 25 | 28 |
| 2019 | 40 | 25 |
| 2020 | 27 | 26 |
| 2021 | 27 | 22 |
| 2022 | 29 | 22 |
| 2023 | 16 | 20 |
| 2024 | 19 | 11 |
| 2025 | 23 | 18 |
| 2026 | 12 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
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- Indexing control system11 Aug 2026US 12,704,034 B2Arrival Energy Solutions Inc.
- Multi-cycle circulation valve activated by balls28 Jul 2026US 12,692,766 B1Universal Completions LLC
- Dormant packer fracturing completion system16 Jun 2026US 12,655,713 B2Schlumberger Technology Corporation
- Drilling head assembly with latching system and fluid retention mechanism12 May 2026US 12,624,604 B2
- Gas Lift Valve Having Variable Orifice17 Sep 2026US 2026/0275838 A1Weatherford Technology Holdings, LLC
- Flowback sub for aicds and daicds13 Aug 2026US 2026/0235013 A1Halliburton Energy Services.Inc.
- Gravity actuated connection mechanism for high pressure wellhead applications6 Aug 2026US 2026/0226809 A1Crown Oil Tools LLC
- Downhole valve assembly with cement-isolated flowpath18 Jun 2026US 2026/0168356 A1NCS Multistage Inc.
- Tubing anchor catcher operated by mandrel axial movement7 May 2026US 2026/0125961 A1
Most cited
By later US patents
- Temporary plug system266US 5,479,986 AHalliburton Company · 1996
- Well completions using casing valves191US 4,949,788 AHalliburton Company · 1990
- Bidirectional disappearing plug146US 5,765,641 AHalliburton Energy Services.Inc. · 1998
- Downhole tool142US 7,416,029 B2Specialised Petroleum Services Group Limited · 2008
- Hydraulically set liner hanger and running tool with backup mechanical setting means138US 4,096,913 ABaker International Corporation · 1978