E21B 33/0355
Control systems
Official title: {Control systems, e.g. hydraulic, pneumatic, electric, acoustic, for submerged well heads}
E21B33/0355 (Control systems) appears on 599 US grants and 598 published applications in this corpus.
Search patents in E21B- Granted patents
- 599
- Published applications
- 598
- Assignees
- 202
- Inventors
- 1,047
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 6 | 0 |
| 1981 | 6 | 0 |
| 1982 | 8 | 0 |
| 1983 | 3 | 0 |
| 1984 | 5 | 0 |
| 1985 | 3 | 0 |
| 1986 | 4 | 0 |
| 1987 | 9 | 0 |
| 1988 | 5 | 0 |
| 1989 | 7 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 0 | 0 |
| 1994 | 3 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 3 | 0 |
| 1999 | 3 | 0 |
| 2000 | 4 | 0 |
| 2001 | 6 | 5 |
| 2002 | 11 | 12 |
| 2003 | 10 | 8 |
| 2004 | 7 | 10 |
| 2005 | 3 | 10 |
| 2006 | 15 | 11 |
| 2007 | 6 | 9 |
| 2008 | 3 | 10 |
| 2009 | 5 | 13 |
| 2010 | 5 | 20 |
| 2011 | 7 | 24 |
| 2012 | 12 | 29 |
| 2013 | 29 | 37 |
| 2014 | 24 | 35 |
| 2015 | 33 | 31 |
| 2016 | 28 | 29 |
| 2017 | 26 | 34 |
| 2018 | 37 | 36 |
| 2019 | 25 | 26 |
| 2020 | 32 | 41 |
| 2021 | 32 | 32 |
| 2022 | 38 | 35 |
| 2023 | 34 | 37 |
| 2024 | 34 | 26 |
| 2025 | 29 | 24 |
| 2026 | 16 | 14 |
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.
- Modular subsea control system4 Aug 2026US 12,698,690 B1OneSubsea IP UK Limited
- Apparatus and methods for electric power management28 Jul 2026US 12,692,758 B2Schlumberger Technology Corporation
- Electrical accumulator system with internal transfer barrier30 Jun 2026US 12,669,029 B2Schlumberger Technology Corporation
- Subsea completion annulus pressure compensation system16 Jun 2026US 12,655,716 B2Chevron U.S.A.Inc.
- Wellhead fatigue damage estimation using probabilistic generative ai models1 Oct 2026US 2026/0298047 A1Chevron U.S.A.Inc.
- Intensifier ram blowout preventer20 Aug 2026US 2026/0243140 A1BOP Technologies, INC
- A subsea control module23 Jul 2026US 2026/0210201 A1
- Integral multi-master power and communication bus rail system23 Jul 2026US 2026/0213516 A1OneSubsea IP UK Limited
- Vertical isolation and flow tree systems and methods18 Jun 2026US 2026/0168346 A1Baker Hughes Oilfield Operations LLC
Most cited
By later US patents
- System and technique for monitoring and managing the deployment of subsea equipment140US 6,725,924 B2Schlumberger Technology Corporation · 2004
- Well valve control system121US 4,636,934 AOtis Engineering Corporation · 1987
- Power source for subsea oil wells98US 4,112,687 A1978
- Rotatable ball valve apparatus and method98US 4,681,133 AHydril Company · 1987
- Rotatable ball valve apparatus and method82US 4,703,807 AHydril Company · 1987