E21B 34/108
With time delay systems
Official title: {with time delay systems, e.g. hydraulic impedance mechanisms}
E21B34/108 (With time delay systems) appears on 125 US grants and 62 published applications in this corpus.
Search patents in E21B- Granted patents
- 125
- Published applications
- 62
- Assignees
- 39
- Inventors
- 152
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 4 | 0 |
| 1985 | 3 | 0 |
| 1986 | 4 | 0 |
| 1987 | 9 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 4 | 0 |
| 2001 | 5 | 2 |
| 2002 | 1 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 1 | 1 |
| 2011 | 1 | 2 |
| 2012 | 2 | 3 |
| 2013 | 0 | 4 |
| 2014 | 5 | 6 |
| 2015 | 5 | 10 |
| 2016 | 4 | 4 |
| 2017 | 7 | 5 |
| 2018 | 8 | 2 |
| 2019 | 3 | 4 |
| 2020 | 5 | 2 |
| 2021 | 4 | 3 |
| 2022 | 6 | 8 |
| 2023 | 3 | 0 |
| 2024 | 2 | 2 |
| 2025 | 1 | 1 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Time delayed actuation of well tool2 Jun 2026US 12,644,357 B2Weatherford Technology Holdings, LLC
- Valve and a method of controlling fluid flow between a fluid supplying device and a fluid receiving device13 Jan 2026US 12,523,317 B2MH Tech AS
- Multi-cycle counter system27 May 2025US 12,312,911 B2Nine Downhole Technologies, LLC
- Multi-cycle counter system30 Apr 2024US 11,970,922 B2Nine Downhole Technologies, LLC
- Port sub with delayed opening sequence26 Mar 2024US 11,939,836 B2Advanced Upstream Ltd.
- Time delayed actuation of well tool27 Nov 2025US 2025/0361791 A1Weatherford Technology Holdings, LLC
- Multi-Cycle Counter System18 Jul 2024US 2024/0240537 A1Nine Downhole Technologies, LLC
- A valve and a method of controlling fluid flow between a fluid supplying device and a fluid receiving device13 Jun 2024US 2024/0191811 A1MH Tech AS
- Multi-Cycle Counter System10 Nov 2022US 2022/0356782 A1Nine Downhole Technologies, LLC
- Valve having a modular activation system10 Nov 2022US 2022/0356784 A1Baker Hughes Oilfield Operations LLC
Most cited
By later US patents
- Delayed opening ball seat153US 6,634,428 B2Baker Hughes Incorporated · 2003
- Annulus pressure operated downhole choke and associated methods119US 5,992,520 AHalliburton Energy Services.Inc. · 1999
- Reclosable circulation valve for use in oil well testing82US 4,113,012 AHalliburton Company · 1978
- Annulus pressure operated downhole choke and associated methods70US 6,073,698 AHalliburton Energy Services.Inc. · 2000
- Pressure controlled reversing valve68US 3,986,554 ASchlumberger Technology Corporation · 1976