E21B 33/064
Specially adapted for underwater well heads
Official title: specially adapted for underwater well heads
E21B33/064 (Specially adapted for underwater well heads) appears on 592 US grants and 619 published applications in this corpus.
Search patents in E21B- Granted patents
- 592
- Published applications
- 619
- Assignees
- 178
- Inventors
- 847
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 6 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 5 | 0 |
| 1985 | 5 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 0 | 0 |
| 1989 | 5 | 0 |
| 1990 | 2 | 0 |
| 1991 | 4 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 3 | 6 |
| 2002 | 8 | 6 |
| 2003 | 9 | 9 |
| 2004 | 5 | 7 |
| 2005 | 3 | 5 |
| 2006 | 5 | 9 |
| 2007 | 6 | 3 |
| 2008 | 3 | 12 |
| 2009 | 3 | 3 |
| 2010 | 6 | 11 |
| 2011 | 5 | 20 |
| 2012 | 7 | 35 |
| 2013 | 18 | 37 |
| 2014 | 34 | 43 |
| 2015 | 53 | 48 |
| 2016 | 49 | 60 |
| 2017 | 48 | 70 |
| 2018 | 56 | 53 |
| 2019 | 48 | 43 |
| 2020 | 43 | 35 |
| 2021 | 36 | 27 |
| 2022 | 24 | 23 |
| 2023 | 31 | 27 |
| 2024 | 16 | 12 |
| 2025 | 13 | 12 |
| 2026 | 7 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- High torque actuated tubing hanger orientation11 Aug 2026US 12,704,037 B2FMC Kongsberg Subsea AS
- Energy delivery system for supplying hydraulic pressure for severing an intervention medium11 Aug 2026US 12,704,042 B2Halliburton Energy Services.Inc.
- Electrical accumulator system with internal transfer barrier30 Jun 2026US 12,669,029 B2Schlumberger Technology Corporation
- Riserless marine package24 Feb 2026US 12,560,047 B2Grant Prideco, L.P.
- Rotating and reciprocating swivel apparatus and method27 Jan 2026US 12,534,972 B2Mako Rentals, Inc.
- High torque actuated tubing hanger orientation9 Apr 2026US 2026/0098452 A1FMC Kongsberg Subsea AS
- Communication networks for bop control5 Feb 2026US 2026/0036012 A1Schlumberger Technology Corporation
- Energy delivery system for supplying hydraulic pressure for severing an interventon medium29 Jan 2026US 2026/0028897 A1Halliburton Energy Services.Inc.
- Temperature gauge for an accumulator nitrogen tank apparatus, system, and method13 Nov 2025US 2025/0347186 A1
- Blowout Preventer Actuation System13 Nov 2025US 2025/0347191 A1Kinetic Pressure Control Ltd.
Most cited
By later US patents
- Subsea hydraulic choke193US 4,046,191 AExxon Production Research Company · 1977
- Marine riser well control method and apparatus160US 4,626,135 AHydril Company · 1986
- Flow diverter155US 4,444,250 AHydril Company · 1984
- Method and apparatus for replacing BOP with gate valve121US 6,601,650 B2Worldwide Oilfield Machine, Inc. · 2003
- Flow diverter103US 4,502,534 AHydril Company · 1985