E21B 41/06
Work chambers for underwater operations
Official title: Work chambers for underwater operations, e.g. temporarily connected to well heads
E21B41/06 (Work chambers for underwater operations) appears on 48 US grants and 18 published applications in this corpus.
Search patents in E21B- Granted patents
- 48
- Published applications
- 18
- Assignees
- 33
- Inventors
- 86
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 7 | 0 |
| 1978 | 5 | 0 |
| 1979 | 3 | 0 |
| 1980 | 0 | 0 |
| 1981 | 5 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 0 | 1 |
| 2010 | 1 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 2 |
| 2015 | 0 | 0 |
| 2016 | 1 | 0 |
| 2017 | 1 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 2 |
| 2020 | 1 | 3 |
| 2021 | 1 | 0 |
| 2022 | 2 | 0 |
| 2023 | 1 | 4 |
| 2024 | 1 | 0 |
| 2025 | 1 | 0 |
| 2026 | 4 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Electrolytic pumping system25 Aug 2026US 12,716,332 B2
- Subsea well intervention systems and methods10 Mar 2026US 12,571,279 B1Halliburton Energy Services.Inc.
- Additive manufacture system3 Mar 2026US 12,565,002 B2Kongsberg Ferrotech AS
- Subsea well intervention systems and methods24 Feb 2026US 12,560,045 B1Halliburton Energy Services.Inc.
- Underwater tools with sacrificial battery20 May 2025US 12,305,505 B1Saudi Arabian Oil Company
- Additive manufacture system9 Jul 2026US 2026/0192520 A1Kongsberg Ferrotech AS
- Electrolytic pumping system11 Jun 2026US 2026/0160156 A1
- Digital twin for rig operations29 Jun 2023US 2023/0205944 A1Nabors Drilling Technologies USA, Inc.
- Digital twin for rig operations29 Jun 2023US 2023/0205945 A1Nabors Drilling Technologies USA, Inc.
- Digital twin for rig operations29 Jun 2023US 2023/0206779 A1Nabors Drilling Technologies USA, Inc.
Most cited
By later US patents
- Offshore drilling and/or production system31US 4,746,245 ADen Norske Stats Oljeselskap A.S. · 1988
- Subsea wellhead connection assembly and methods of installation30US 4,437,521 AMobil Oil Corporation · 1984
- Work arm system for submergible chamber21US 4,030,309 A1977
- Method for connecting a submerged well head to a pipe consisting of steel tubes19US 4,004,635 ASubsea Equipment Associates Limited · 1977
- Method and apparatus for joining a subsea pipeline to an offshore platform riser17US 3,967,462 ALockheed Petroleum Services, Ltd. · 1976