E21B 23/04115
Using radial pistons
Official title: {using radial pistons}
E21B23/04115 (Using radial pistons) appears on 77 US grants and 62 published applications in this corpus.
Search patents in E21B- Granted patents
- 77
- Published applications
- 62
- Assignees
- 48
- Inventors
- 112
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 4 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 1 |
| 2004 | 2 | 3 |
| 2005 | 1 | 1 |
| 2006 | 3 | 1 |
| 2007 | 2 | 1 |
| 2008 | 0 | 1 |
| 2009 | 2 | 4 |
| 2010 | 1 | 3 |
| 2011 | 3 | 5 |
| 2012 | 3 | 2 |
| 2013 | 2 | 2 |
| 2014 | 2 | 2 |
| 2015 | 5 | 2 |
| 2016 | 3 | 5 |
| 2017 | 2 | 4 |
| 2018 | 1 | 2 |
| 2019 | 2 | 0 |
| 2020 | 4 | 5 |
| 2021 | 5 | 4 |
| 2022 | 1 | 4 |
| 2023 | 3 | 3 |
| 2024 | 4 | 3 |
| 2025 | 3 | 2 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Annular pressure activated downhole tool28 Jul 2026US 12,692,760 B2Baker Hughes Oilfield Operations LLC
- Annular pressure activated downhole tool21 Jul 2026US 12,687,080 B2Baker Hughes Oilfield Operations LLC
- Extensible transition joint for control line protection16 Dec 2025US 12,497,843 B2Halliburton Energy Services.Inc.
- Downhole tool string27 May 2025US 12,312,886 B2Welltec A/S
- Slip subsystem, method and system25 Mar 2025US 12,258,829 B1Baker Hughes Oilfield Operations LLC
- Extensible transition joint for control line protection12 Mar 2026US 2026/0071502 A1Halliburton Energy Services.Inc.
- Downhole tool string14 Aug 2025US 2025/0257621 A1Welltec A/S
- Slip subsystem, method and system20 Mar 2025US 2025/0092746 A1Baker Hughes Oilfield Operations LLC
- Extensible Transition Joint For Control Line Protection5 Sep 2024US 2024/0295150 A1Halliburton Energy Services.Inc.
- Annular pressure activated downhole tool25 Jul 2024US 2024/0247558 A1Baker Hughes Oilfield Operations LLC
Most cited
By later US patents
- Self powered downhole tool anchor172US 4,429,741 AChristensen, Inc. · 1984
- Gripper assembly for downhole tractors62US 6,464,003 B2Western Well Tool, Inc. · 2002
- Gripper assembly for downhole tools56US 6,640,894 B2Western Well Tool, Inc. · 2003
- Gripper assembly for downhole tools47US 7,048,047 B2Western Well Tool, Inc. · 2006
- Downhole force generator46US 5,070,941 AOtis Engineering Corporation · 1991