E21B 23/0421
Using multiple hydraulically interconnected pistons
Official title: {using multiple hydraulically interconnected pistons}
E21B23/0421 (Using multiple hydraulically interconnected pistons) appears on 57 US grants and 60 published applications in this corpus.
Search patents in E21B- Granted patents
- 57
- Published applications
- 60
- Assignees
- 25
- Inventors
- 101
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 1 |
| 2002 | 1 | 1 |
| 2003 | 1 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 2 |
| 2006 | 1 | 0 |
| 2007 | 0 | 2 |
| 2008 | 0 | 0 |
| 2009 | 1 | 1 |
| 2010 | 1 | 3 |
| 2011 | 0 | 3 |
| 2012 | 3 | 1 |
| 2013 | 2 | 3 |
| 2014 | 2 | 4 |
| 2015 | 2 | 5 |
| 2016 | 1 | 3 |
| 2017 | 3 | 1 |
| 2018 | 5 | 1 |
| 2019 | 2 | 4 |
| 2020 | 0 | 4 |
| 2021 | 4 | 4 |
| 2022 | 5 | 4 |
| 2023 | 3 | 3 |
| 2024 | 4 | 3 |
| 2025 | 4 | 3 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Apparatus and methods for operating downhole tools26 May 2026US 12,637,917 B2Wellbore Integrity Solutions LLC
- Extensible transition joint for control line protection16 Dec 2025US 12,497,843 B2Halliburton Energy Services.Inc.
- Downhole tool employing a pressure intensifier30 Sep 2025US 12,428,920 B2Halliburton Energy Services.Inc.
- Intensifying setting tool for packer29 Jul 2025US 12,371,961 B1Weatherford Technology Holdings, LLC
- Activation of downhole mechanical device with inclination and/or change in RPM4 Feb 2025US 12,215,567 B2Halliburton Energy Services.Inc.
- Downhole tool including a pressure intensifier1 Oct 2026US 2026/0298043 A1Halliburton Energy Services.Inc.
- Apparatus and Methods for Operating Downhole Tools30 Apr 2026US 2026/0117612 A1Wellbore Integrity Solutions LLC
- Extensible transition joint for control line protection12 Mar 2026US 2026/0071502 A1Halliburton Energy Services.Inc.
- Downhole tool employing a pressure intensifier25 Dec 2025US 2025/0389165 A1Halliburton Energy Services.Inc.
- Downhole tool employing a pressure intensifier10 Jul 2025US 2025/0223882 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Well tool for completing a well186US 5,535,824 ABestline Liner Systems · 1996
- Process for completing a well89US 5,497,840 ABestline Liner Systems · 1996
- Process for completing a well72US 5,613,567 ABestline Liner Systems · 1997
- Apparatus for facilitating the connection of tubulars using a top drive69US 7,137,454 B2Weatherford/Lamb, Inc. · 2006
- Down hole drilling tool control mechanism61US 5,224,558 A1993