E21B 34/04
In underwater well heads
Official title: in underwater well heads
E21B34/04 (In underwater well heads) appears on 511 US grants and 454 published applications in this corpus.
Search patents in E21B- Granted patents
- 511
- Published applications
- 454
- Assignees
- 153
- Inventors
- 738
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 4 | 0 |
| 1982 | 4 | 0 |
| 1983 | 2 | 0 |
| 1984 | 5 | 0 |
| 1985 | 5 | 0 |
| 1986 | 6 | 0 |
| 1987 | 6 | 0 |
| 1988 | 5 | 0 |
| 1989 | 6 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 6 | 0 |
| 1999 | 12 | 0 |
| 2000 | 10 | 0 |
| 2001 | 8 | 6 |
| 2002 | 12 | 13 |
| 2003 | 11 | 12 |
| 2004 | 14 | 12 |
| 2005 | 4 | 11 |
| 2006 | 13 | 7 |
| 2007 | 4 | 6 |
| 2008 | 4 | 2 |
| 2009 | 3 | 11 |
| 2010 | 1 | 9 |
| 2011 | 7 | 20 |
| 2012 | 14 | 19 |
| 2013 | 18 | 25 |
| 2014 | 24 | 26 |
| 2015 | 21 | 31 |
| 2016 | 24 | 29 |
| 2017 | 28 | 29 |
| 2018 | 26 | 29 |
| 2019 | 33 | 16 |
| 2020 | 18 | 29 |
| 2021 | 26 | 33 |
| 2022 | 29 | 18 |
| 2023 | 25 | 25 |
| 2024 | 24 | 9 |
| 2025 | 7 | 17 |
| 2026 | 16 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Electrolytic pumping system25 Aug 2026US 12,716,332 B2
- Energy delivery system for supplying hydraulic pressure for severing an intervention medium11 Aug 2026US 12,704,042 B2Halliburton Energy Services.Inc.
- Modular subsea control system4 Aug 2026US 12,698,690 B1OneSubsea IP UK Limited
- Electrical actuation of a valve in a wellhead assembly9 Jun 2026US 12,650,054 B2Innovex International, Inc.
- Subsea actuator and associated methods9 Jun 2026US 12,650,058 B2Onesubsea, LLC
- System and method for barrier testing injection xmas tree24 Sep 2026US 2026/0286840 A1
- Magnetically actuated gate valve3 Sep 2026US 2026/0258880 A1FMC Technologies, Inc.
- Integrated Injection System30 Jul 2026US 2026/0218586 A1OneSubsea IP UK Limited
- Vertical isolation and flow tree systems and methods18 Jun 2026US 2026/0168346 A1Baker Hughes Oilfield Operations LLC
- Vertical isolation and flow tree systems and methods18 Jun 2026US 2026/0168347 A1Baker Hughes Oilfield Operations LLC
Most cited
By later US patents
- Subsea wellhead apparatus87US 5,143,158 ADril-Quip, Inc. · 1992
- Insert tree81US 5,971,077 AABB Vetco Gray Inc. · 1999
- Valve control system78US 4,880,060 AHalliburton Company · 1989
- Sub-sea well injection system77US 5,085,277 AThe British Petroleum Company p.l.c. · 1992
- System and method for managing heave pressure from a floating rig73US 8,347,982 B2Weatherford/Lamb, Inc. · 2013