E21B 23/0412
Characterised by pressure chambers
Official title: {characterised by pressure chambers, e.g. vacuum chambers}
E21B23/0412 (Characterised by pressure chambers) appears on 226 US grants and 206 published applications in this corpus.
Search patents in E21B- Granted patents
- 226
- Published applications
- 206
- Assignees
- 89
- Inventors
- 434
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 5 | 0 |
| 1991 | 3 | 0 |
| 1992 | 4 | 0 |
| 1993 | 5 | 0 |
| 1994 | 0 | 0 |
| 1995 | 3 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 4 |
| 2003 | 3 | 1 |
| 2004 | 1 | 3 |
| 2005 | 1 | 3 |
| 2006 | 2 | 1 |
| 2007 | 3 | 4 |
| 2008 | 1 | 6 |
| 2009 | 6 | 5 |
| 2010 | 3 | 5 |
| 2011 | 4 | 7 |
| 2012 | 5 | 10 |
| 2013 | 4 | 11 |
| 2014 | 12 | 20 |
| 2015 | 11 | 17 |
| 2016 | 10 | 16 |
| 2017 | 12 | 5 |
| 2018 | 18 | 7 |
| 2019 | 6 | 8 |
| 2020 | 8 | 14 |
| 2021 | 13 | 11 |
| 2022 | 19 | 18 |
| 2023 | 11 | 13 |
| 2024 | 11 | 9 |
| 2025 | 14 | 4 |
| 2026 | 5 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Gas driven wireline release tool25 Aug 2026US 12,716,307 B2DynaEnergetics Europe GmbH
- Well tool actuation upon pressure decrease7 Jul 2026US 12,674,374 B2Weatherford Technology Holdings, LLC
- Downhole tool7 Jul 2026US 12,674,377 B2Odfjell Technology Invest Ltd
- Apparatus and methods for operating downhole tools26 May 2026US 12,637,917 B2Wellbore Integrity Solutions LLC
- Safety device for a linearly actuated process valve26 May 2026US 12,638,097 B2Robert Bosch GmbH
- 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
- Intervention-less method of setting open hole packers23 Apr 2026US 2026/0110229 A1Halliburton Energy Services.Inc.
- Safety valve, well system, and method employing a pressure sensor9 Apr 2026US 2026/0098465 A1Halliburton Energy Services.Inc.
- Gas driven wireline release tool25 Dec 2025US 2025/0389164 A1DynaEnergetics Europe GmbH
Most cited
By later US patents
- Downhole anchoring tools conveyed by non-rigid carriers190US 6,315,043 B1Schlumberger Technology Corporation · 2001
- Well tool control system and method152US 4,796,699 ASchlumberger Technology Corporation · 1989
- Downhole anchoring tools conveyed by non-rigid carriers135US 6,651,747 B2Schlumberger Technology Corporation · 2003
- Multiple well tool control systems in a multi-valve well testing system having automatic control modes122US 4,896,722 ASchlumberger Technology Corporation · 1990
- Subsurface tubing hanger and stinger assembly118US 4,363,358 ADresser Industries, Inc. · 1982