E21B 31/1135
Jars with a hydraulic impedance mechanism, i.e. a restriction, for initially delaying
Official title: {Jars with a hydraulic impedance mechanism, i.e. a restriction, for initially delaying escape of a restraining fluid}
E21B31/1135 (Jars with a hydraulic impedance mechanism, i.e. a restriction, for initially delaying) appears on 88 US grants and 68 published applications in this corpus.
Search patents in E21B- Granted patents
- 88
- Published applications
- 68
- Assignees
- 40
- Inventors
- 117
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 4 | 0 |
| 2002 | 1 | 1 |
| 2003 | 2 | 2 |
| 2004 | 3 | 1 |
| 2005 | 0 | 3 |
| 2006 | 1 | 3 |
| 2007 | 4 | 2 |
| 2008 | 1 | 1 |
| 2009 | 1 | 7 |
| 2010 | 4 | 1 |
| 2011 | 4 | 2 |
| 2012 | 2 | 2 |
| 2013 | 3 | 7 |
| 2014 | 3 | 2 |
| 2015 | 3 | 3 |
| 2016 | 2 | 6 |
| 2017 | 7 | 1 |
| 2018 | 0 | 5 |
| 2019 | 4 | 6 |
| 2020 | 9 | 4 |
| 2021 | 3 | 2 |
| 2022 | 5 | 3 |
| 2023 | 3 | 3 |
| 2024 | 3 | 0 |
| 2025 | 1 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Jarring device18 Aug 2026US 12,709,956 B1Petromac IP Limited
- Impact jar delay, activation indicator, shock absorber, and relatch assist16 Dec 2025US 12,497,851 B2Weatherford Technology Holdings, LLC
- Fishing jar3 Sep 2024US 12,078,021 B2Innovex Downhole Solutions, Inc.
- Modular casing reamer shoe system with jarring capability11 Jun 2024US 12,006,769 B2Saudi Arabian Oil Company
- Release lugs for a jarring device16 Apr 2024US 11,959,350 B2
- Impact Jar Delay, Activation Indicator, Shock Absorber, and Relatch Assist21 Aug 2025US 2025/0263996 A1Weatherford Technology Holdings, LLC
- Fishing jar27 Jul 2023US 2023/0235639 A1Innovex Downhole Solutions, Inc.
- Modular casing reamer shoe system with jarring capability27 Apr 2023US 2023/0125843 A1Saudi Arabian Oil Company
- Downhole tool for jarring2 Mar 2023US 2023/0066142 A1Schlumberger Technology Corporation
- Fluid-driven pulsing hammering tool1 Sep 2022US 2022/0274239 A1
Most cited
By later US patents
- Downhole anchoring tools conveyed by non-rigid carriers190US 6,315,043 B1Schlumberger Technology Corporation · 2001
- Downhole anchoring tools conveyed by non-rigid carriers135US 6,651,747 B2Schlumberger Technology Corporation · 2003
- Methods and apparatus to control downhole tools120US 6,655,460 B2Weatherford/Lamb, Inc. · 2003
- Methods and apparatus to control downhole tools99US 7,025,130 B2Weatherford/Lamb, Inc. · 2006
- Hydraulic jar65US 6,290,004 B12001