E21B 34/085
With time-delay systems
Official title: {with time-delay systems, e.g. hydraulic impedance mechanisms}
E21B34/085 (With time-delay systems) appears on 34 US grants and 38 published applications in this corpus.
Search patents in E21B- Granted patents
- 34
- Published applications
- 38
- Assignees
- 22
- Inventors
- 92
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 1 |
| 2005 | 1 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 1 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 5 |
| 2013 | 1 | 3 |
| 2014 | 1 | 1 |
| 2015 | 2 | 0 |
| 2016 | 4 | 4 |
| 2017 | 2 | 2 |
| 2018 | 1 | 5 |
| 2019 | 2 | 3 |
| 2020 | 4 | 5 |
| 2021 | 4 | 1 |
| 2022 | 2 | 1 |
| 2023 | 0 | 1 |
| 2024 | 1 | 1 |
| 2025 | 0 | 0 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Delayed opening port assembly24 Mar 2026US 12,584,377 B2ExxonMobil Technology and Engineering Company
- Contact chamber flushing apparatus for concentric electrical wet connect2 Jul 2024US 12,024,955 B2Halliburton Energy Services.Inc.
- Delayed opening port assembly27 Sep 2022US 11,454,087 B2Advanced Upstream Ltd.
- Multi-piston activation mechanism31 May 2022US 11,346,183 B2Halliburton Energy Services.Inc.
- Apparatus, systems and methods for actuation of downhole tools28 Sep 2021US 11,131,164 B2NCS Multistage Inc.
- Scale inhibitor squeeze treatment system and method of using the same9 Jul 2026US 2026/0193962 A1Halliburton Energy Services.Inc.
- Downhole fluid flow control device30 Apr 2026US 2026/0117620 A1Saja Energy UK Limited
- Contact chamber flushing appartus for concentric electrical wet connect18 Apr 2024US 2024/0125183 A1Halliburton Energy Services.Inc.
- Delayed opening port assembly19 Jan 2023US 2023/0012820 A1Advanced Upstream Ltd.
- Shutoff Valve17 Feb 2022US 2022/0049575 A1PetroQuip Energy Services, LLC
Most cited
By later US patents
- Bottom hole assembly85US 6,832,654 B2BJ Services Company · 2004
- Release tool for coiled tubing74US 7,249,633 B2BJ Services Company · 2007
- Shut-in tools68US 5,279,363 AHalliburton Company · 1994
- Shut-in tools60US 5,332,035 AHalliburton Company · 1994
- Shut-in tools58US 5,234,057 AHalliburton Company · 1993