E21B 23/042
Using a single piston or multiple mechanically interconnected pistons
Official title: {using a single piston or multiple mechanically interconnected pistons}
E21B23/042 (Using a single piston or multiple mechanically interconnected pistons) appears on 663 US grants and 387 published applications in this corpus.
Search patents in E21B- Granted patents
- 663
- Published applications
- 387
- Assignees
- 178
- Inventors
- 882
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 1 | 0 |
| 1978 | 7 | 0 |
| 1979 | 4 | 0 |
| 1980 | 1 | 0 |
| 1981 | 17 | 0 |
| 1982 | 7 | 0 |
| 1983 | 5 | 0 |
| 1984 | 2 | 0 |
| 1985 | 6 | 0 |
| 1986 | 5 | 0 |
| 1987 | 8 | 0 |
| 1988 | 10 | 0 |
| 1989 | 13 | 0 |
| 1990 | 11 | 0 |
| 1991 | 10 | 0 |
| 1992 | 15 | 0 |
| 1993 | 16 | 0 |
| 1994 | 16 | 0 |
| 1995 | 17 | 0 |
| 1996 | 15 | 0 |
| 1997 | 9 | 0 |
| 1998 | 23 | 0 |
| 1999 | 20 | 0 |
| 2000 | 19 | 0 |
| 2001 | 23 | 3 |
| 2002 | 23 | 18 |
| 2003 | 13 | 12 |
| 2004 | 13 | 20 |
| 2005 | 9 | 12 |
| 2006 | 16 | 7 |
| 2007 | 7 | 16 |
| 2008 | 12 | 14 |
| 2009 | 13 | 17 |
| 2010 | 10 | 21 |
| 2011 | 17 | 17 |
| 2012 | 15 | 19 |
| 2013 | 13 | 6 |
| 2014 | 13 | 26 |
| 2015 | 23 | 27 |
| 2016 | 19 | 12 |
| 2017 | 17 | 16 |
| 2018 | 18 | 17 |
| 2019 | 16 | 14 |
| 2020 | 18 | 15 |
| 2021 | 17 | 17 |
| 2022 | 18 | 15 |
| 2023 | 13 | 14 |
| 2024 | 16 | 13 |
| 2025 | 19 | 12 |
| 2026 | 11 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hydraulic lock apparatus8 Sep 2026US 12,729,603 B2Welleng Science and Technology Ltd.
- Annular piston pile driver18 Aug 2026US 12,709,945 B2Dig Energy, Inc.
- Annular pressure activated downhole tool28 Jul 2026US 12,692,760 B2Baker Hughes Oilfield Operations LLC
- Wireline setting assembly21 Jul 2026US 12,687,079 B1Wellbore Solutions, Inc.
- Annular pressure activated downhole tool21 Jul 2026US 12,687,080 B2Baker Hughes Oilfield Operations LLC
- Hydraulically actuated connection for downhole tools10 Sep 2026US 2026/0266152 A1Wellbore Integrity Solutions LLC
- Mobility analysis3 Sep 2026US 2026/0258708 A1
- Downhole tool3 Sep 2026US 2026/0258709 A1Welltec A/S
- Individual or paired arm control in a wellbore tractor30 Jul 2026US 2026/0218579 A1Gowell Technology Norway AS
- Pressure intensifier module for additional setting force in a retrievable bridge plug30 Jul 2026US 2026/0218580 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Temporary plug system266US 5,479,986 AHalliburton Company · 1996
- Drilling with casing and retrievable bit-motor assembly249US 5,472,057 AAtlantic Richfield Company · 1995
- Hydraulically actuated liner hanger arrangement and method215US 5,318,131 A1994
- Method and apparatus for providing controlled force transference to a wellbore tool200US 5,343,963 A1994
- Method & apparatus for actuating a downhole tool198US 5,558,153 ABaker Hughes Incorporated · 1996