E21B 34/045
Adapted to be lowered on a tubular string into position within a
Official title: {adapted to be lowered on a tubular string into position within a blow-out preventer stack, e.g. so-called test trees}
E21B34/045 (Adapted to be lowered on a tubular string into position within a) appears on 99 US grants and 60 published applications in this corpus.
Search patents in E21B- Granted patents
- 99
- Published applications
- 60
- Assignees
- 30
- Inventors
- 125
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 4 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 4 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 7 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 3 |
| 2006 | 2 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 1 | 4 |
| 2010 | 0 | 1 |
| 2011 | 0 | 3 |
| 2012 | 3 | 4 |
| 2013 | 5 | 7 |
| 2014 | 6 | 3 |
| 2015 | 3 | 7 |
| 2016 | 5 | 4 |
| 2017 | 6 | 8 |
| 2018 | 4 | 2 |
| 2019 | 6 | 1 |
| 2020 | 4 | 4 |
| 2021 | 1 | 2 |
| 2022 | 4 | 0 |
| 2023 | 2 | 3 |
| 2024 | 3 | 0 |
| 2025 | 0 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Energy delivery system for supplying hydraulic pressure for severing an intervention medium11 Aug 2026US 12,704,042 B2Halliburton Energy Services.Inc.
- Subsea tree including a fluid swivel27 Aug 2024US 12,071,828 B2Pivotree Pty Ltd
- Automatic choking hydraulic shock reduction valve9 Jul 2024US 12,031,403 B2Hydril USA Distribution LLC
- Subsea test tree fast ball actuation with low pressure pump through capability23 Apr 2024US 11,965,394 B1Halliburton Energy Services.Inc.
- Hydraulic line controlled device with density barrier26 Dec 2023US 11,851,981 B2Halliburton Energy Services.Inc.
- Energy delivery system for supplying hydraulic pressure for severing an interventon medium29 Jan 2026US 2026/0028897 A1Halliburton Energy Services.Inc.
- Heat transfer spool for injection wells16 Oct 2025US 2025/0320792 A1Baker Hughes Oilfield Operations LLC
- Subsea Tree Including a Fluid Swivel24 Aug 2023US 2023/0265729 A1Pivotree Pty Ltd
- Automatic choking hydraulic shock reduction valve9 Mar 2023US 2023/0075775 A1Baker Hughes Oilfield Operations LLC
- Valve assembly for controlling fluid communication along a well tubular2 Feb 2023US 2023/0036622 A1Expro North Sea Limited
Most cited
By later US patents
- Valve control system78US 4,880,060 AHalliburton Company · 1989
- Acoustic subsea test tree and method64US 4,375,239 AHalliburton Company · 1983
- Hydraulic connector apparatus and method58US 4,347,900 AHalliburton Company · 1982
- Test tree closure device for a cased subsea oil well56US 5,771,974 ASchlumberger Technology Corporation · 1998
- Subsea master valve for use in well testing52US 4,658,904 ASchlumberger Technology Corporation · 1987