E21B 33/038
Connectors used on well heads
Official title: Connectors used on well heads, e.g. for connecting blow-out preventer and riser
E21B33/038 (Connectors used on well heads) appears on 860 US grants and 706 published applications in this corpus.
Search patents in E21B- Granted patents
- 860
- Published applications
- 706
- Assignees
- 277
- Inventors
- 1,332
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 4 | 0 |
| 1978 | 7 | 0 |
| 1979 | 5 | 0 |
| 1980 | 9 | 0 |
| 1981 | 6 | 0 |
| 1982 | 7 | 0 |
| 1983 | 11 | 0 |
| 1984 | 15 | 0 |
| 1985 | 9 | 0 |
| 1986 | 14 | 0 |
| 1987 | 19 | 0 |
| 1988 | 5 | 0 |
| 1989 | 17 | 0 |
| 1990 | 12 | 0 |
| 1991 | 11 | 0 |
| 1992 | 9 | 0 |
| 1993 | 11 | 0 |
| 1994 | 6 | 0 |
| 1995 | 5 | 0 |
| 1996 | 5 | 0 |
| 1997 | 5 | 0 |
| 1998 | 2 | 0 |
| 1999 | 8 | 0 |
| 2000 | 12 | 0 |
| 2001 | 9 | 5 |
| 2002 | 11 | 6 |
| 2003 | 16 | 14 |
| 2004 | 7 | 15 |
| 2005 | 9 | 17 |
| 2006 | 6 | 19 |
| 2007 | 12 | 12 |
| 2008 | 13 | 14 |
| 2009 | 10 | 14 |
| 2010 | 13 | 21 |
| 2011 | 10 | 30 |
| 2012 | 19 | 31 |
| 2013 | 23 | 33 |
| 2014 | 31 | 41 |
| 2015 | 44 | 33 |
| 2016 | 29 | 43 |
| 2017 | 41 | 34 |
| 2018 | 47 | 44 |
| 2019 | 29 | 38 |
| 2020 | 40 | 45 |
| 2021 | 44 | 44 |
| 2022 | 46 | 49 |
| 2023 | 48 | 41 |
| 2024 | 39 | 21 |
| 2025 | 30 | 21 |
| 2026 | 16 | 21 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- High torque actuated tubing hanger orientation11 Aug 2026US 12,704,037 B2FMC Kongsberg Subsea AS
- Subsea pumping and booster system19 May 2026US 12,631,096 B2Baker Hughes Energy Technology UK Limited
- Safety controls for electrical submersible pump systems28 Apr 2026US 12,612,917 B1Halliburton Energy Services.Inc.
- Subsea connection enhancement assembly7 Apr 2026US 12,595,712 B2OneSubsea IP UK Limited
- Externally pressure-testable connector assembly7 Apr 2026US 12,595,713 B1
- Subsea pumping and booster system17 Sep 2026US 2026/0275839 A1Baker Hughes Energy Technology UK Limited
- Magnetically coupled inflow control device10 Sep 2026US 2026/0266155 A1Halliburton Energy Services.Inc.
- Systems and methods for reconfiguring equipment subsea3 Sep 2026US 2026/0258711 A1BP Corporation North America Inc.
- Subsea connection enhancement assembly13 Aug 2026US 2026/0235009 A1OneSubsea IP UK Limited
- Connection apparatus6 Aug 2026US 2026/0229815 A1Baker Hughes Energy Technology UK Limited
Most cited
By later US patents
- Device for inserting tubular members together116US 5,095,991 AVetco Gray Inc. · 1992
- Inductive-coupling connector for a well head equipment103US 5,052,941 ASchlumberger Technology Corporation · 1991
- Lightweight intervention system100US 6,053,252 AExpro North Sea Limited · 2000
- Well installation in which electrical current is supplied for a source at the wellhead to an electrically responsive device located a substantial distance below the wellhead98US 4,852,648 AAVA International Corporation · 1989
- Method and apparatus for tensioning tubular members92US 6,516,887 B2Cooper Cameron Corporation · 2003