E21B 23/0422
Characterised by radial pistons
Official title: {characterised by radial pistons (using radial pistons for anchoring E21B23/04115)}
E21B23/0422 (Characterised by radial pistons) appears on 41 US grants and 31 published applications in this corpus.
Search patents in E21B- Granted patents
- 41
- Published applications
- 31
- Assignees
- 28
- Inventors
- 83
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 4 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 2 | 1 |
| 2004 | 2 | 3 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 2 |
| 2011 | 2 | 2 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 0 | 3 |
| 2015 | 3 | 1 |
| 2016 | 1 | 0 |
| 2017 | 0 | 3 |
| 2018 | 1 | 1 |
| 2019 | 1 | 2 |
| 2020 | 3 | 2 |
| 2021 | 1 | 2 |
| 2022 | 3 | 2 |
| 2023 | 1 | 1 |
| 2024 | 1 | 0 |
| 2025 | 2 | 3 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Perforating tool with a hydraulically actuated assembly23 Jun 2026US 12,662,914 B2Saudi Arabian Oil Company
- Drilling head assembly with latching system and fluid retention mechanism12 May 2026US 12,624,604 B2
- Drilling head assembly with latching system and fluid retention mechanism19 Aug 2025US 12,392,201 B1
- Drilling head assembly with latching system and fluid retention mechanism29 Apr 2025US 12,286,849 B1
- Pressure isolation ring to isolate the setting chamber once hydraulic packer is set2 Jan 2024US 11,859,463 B2Halliburton Energy Services.Inc.
- Perforating tool with a hydraulically actuated assembly24 Sep 2026US 2026/0286813 A1Saudi Arabian Oil Company
- Perforating tool with a hydraulically actuated assembly23 Oct 2025US 2025/0327383 A1Saudi Arabian Oil Company
- Drilling head assembly with latching system and fluid retention mechanism7 Aug 2025US 2025/0250866 A1
- Drilling head assembly with latching system and fluid retention mechanism7 Aug 2025US 2025/0250881 A1
- Pressure Isolation Ring To Isolate The Setting Chamber Once Hydraulic Packer Is Set8 Jun 2023US 2023/0175346 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Downhole activated process and apparatus for centralizing pipe in a wellbore129US 5,228,518 AConoco Inc. · 1993
- Stabilizer for use in a drill string120US 6,622,803 B2Rotary Drilling Technology, LLC · 2003
- Downhole adjustable stabilizer116US 5,293,945 ABaroid Technology, Inc. · 1994
- Downhole adjustable stabilizer and method93US 5,265,684 ABaroid Technology, Inc. · 1993
- Drilling tool for sinking wells in underground rock formations70US 5,168,941 ABaker Hughes Incorporated · 1992