E21B 17/06
Releasing-joints
Official title: Releasing-joints, e.g. safety joints
E21B17/06 (Releasing-joints) appears on 596 US grants and 405 published applications in this corpus.
Search patents in E21B- Granted patents
- 596
- Published applications
- 405
- Assignees
- 196
- Inventors
- 977
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 10 | 0 |
| 1982 | 2 | 0 |
| 1983 | 5 | 0 |
| 1984 | 13 | 0 |
| 1985 | 12 | 0 |
| 1986 | 12 | 0 |
| 1987 | 14 | 0 |
| 1988 | 12 | 0 |
| 1989 | 9 | 0 |
| 1990 | 19 | 0 |
| 1991 | 9 | 0 |
| 1992 | 14 | 0 |
| 1993 | 14 | 0 |
| 1994 | 7 | 0 |
| 1995 | 6 | 0 |
| 1996 | 7 | 0 |
| 1997 | 4 | 0 |
| 1998 | 17 | 0 |
| 1999 | 10 | 0 |
| 2000 | 14 | 0 |
| 2001 | 15 | 1 |
| 2002 | 12 | 5 |
| 2003 | 4 | 10 |
| 2004 | 7 | 17 |
| 2005 | 8 | 11 |
| 2006 | 7 | 8 |
| 2007 | 9 | 10 |
| 2008 | 8 | 8 |
| 2009 | 4 | 10 |
| 2010 | 13 | 15 |
| 2011 | 6 | 20 |
| 2012 | 14 | 17 |
| 2013 | 23 | 29 |
| 2014 | 19 | 23 |
| 2015 | 14 | 26 |
| 2016 | 15 | 16 |
| 2017 | 24 | 20 |
| 2018 | 17 | 18 |
| 2019 | 17 | 16 |
| 2020 | 23 | 19 |
| 2021 | 22 | 15 |
| 2022 | 24 | 20 |
| 2023 | 18 | 15 |
| 2024 | 21 | 26 |
| 2025 | 25 | 17 |
| 2026 | 11 | 13 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Electro-mechanical disconnect mechanism29 Sep 2026US 12,747,641 B2Schlumberger Technology Corporation
- Releasable retrieving tool with lug and slot connection25 Aug 2026US 12,716,300 B2Vangaard Downhole Inc.
- Clutch assembly for a drill string and related methods11 Aug 2026US 12,704,033 B2NTS Amega West USA, Inc.
- Threaded connection for exploration and production of a hydrocarbon well4 Aug 2026US 12,698,683 B2Tenaris Connections Limited
- Preventing loss of hydrocarbon well conveyance string upon unintended connector decoupling5 May 2026US 12,618,296 B1Halliburton Energy Services.Inc.
- Bi-directional Running Tool for Expandable Liner Hanger8 Oct 2026US 2026/0309007 A1Halliburton Energy Services.Inc.
- Downhole tools for launching obturating members within a wellbore24 Sep 2026US 2026/0286787 A1Grant Prideco, L.P.
- Method and apparatus for disconnecting completion string sections27 Aug 2026US 2026/0251022 A1
- Downhole completion assembly and systems and related methods of use6 Aug 2026US 2026/0226807 A1
- Field redressable shear blocker for fuzion tools to eliminate the shear to release contingency23 Jul 2026US 2026/0210192 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Method and apparatus for downhole fluid blast cleaning of oil well casing191US 5,797,454 ASonoma Corporation · 1998
- Composite coiled tubing apparatus and methods167US 5,828,003 ADowell, a division of Schlumberger Technology Corporation · 1998
- Downhole oil well tool running and pulling with hydraulic release using deformable ball valving member147US 5,695,009 ASonoma Corporation · 1997
- Downhole running tool136US 6,050,341 APetroline Wellsystems Limited · 2000
- Remotely operable releasable pipe connector134US 4,611,662 AAmoco Corporation · 1986