E21B 41/04
Manipulators for underwater operations
Official title: Manipulators for underwater operations, e.g. temporarily connected to well heads
E21B41/04 (Manipulators for underwater operations) appears on 304 US grants and 252 published applications in this corpus.
Search patents in E21B- Granted patents
- 304
- Published applications
- 252
- Assignees
- 162
- Inventors
- 687
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 4 | 0 |
| 1978 | 6 | 0 |
| 1979 | 3 | 0 |
| 1980 | 5 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 3 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 8 | 0 |
| 1987 | 9 | 0 |
| 1988 | 6 | 0 |
| 1989 | 5 | 0 |
| 1990 | 1 | 0 |
| 1991 | 6 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 5 | 0 |
| 2000 | 6 | 0 |
| 2001 | 4 | 2 |
| 2002 | 1 | 3 |
| 2003 | 3 | 3 |
| 2004 | 6 | 4 |
| 2005 | 2 | 3 |
| 2006 | 3 | 2 |
| 2007 | 4 | 4 |
| 2008 | 0 | 5 |
| 2009 | 2 | 6 |
| 2010 | 5 | 7 |
| 2011 | 1 | 9 |
| 2012 | 5 | 15 |
| 2013 | 9 | 16 |
| 2014 | 11 | 13 |
| 2015 | 18 | 12 |
| 2016 | 11 | 20 |
| 2017 | 14 | 14 |
| 2018 | 16 | 25 |
| 2019 | 13 | 25 |
| 2020 | 25 | 15 |
| 2021 | 12 | 9 |
| 2022 | 13 | 9 |
| 2023 | 13 | 6 |
| 2024 | 8 | 10 |
| 2025 | 11 | 10 |
| 2026 | 7 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System for detecting an entity in the vicinity of a drilling machine, and corresponding method25 Aug 2026US 12,715,740 B2Mbi Produits De Forage Inc.
- Electrolytic pumping system25 Aug 2026US 12,716,332 B2
- Subsea actuation system with retrievable position indicator4 Aug 2026US 12,698,689 B2TechnipFMC Norge AS
- Safety device for a linearly actuated process valve26 May 2026US 12,638,097 B2Robert Bosch GmbH
- ROV mateable subsea coupler28 Apr 2026US 12,614,874 B2Siemens Energy Global GmbH & Co. KG
- System and method for subsea assembly of a guide cone on a manifold hub17 Sep 2026US 2026/0275832 A1Petroleo Brasileiro S.A. - Petrobras
- Electrolytic pumping system11 Jun 2026US 2026/0160156 A1
- Centrifugal pump for heating fluid by eddy current, and subsea tool for heating fluid by eddy current5 Mar 2026US 2026/0063016 A1Petroleo Brasileiro S.A. - Petrobras
- Tubing head spools with orientation feature12 Feb 2026US 2026/0043305 A1Baker Hughes Energy Technology UK Limited
- Remote Well Stimulation Method12 Feb 2026US 2026/0043315 A1C-Innovation, LLC
Most cited
By later US patents
- Underwater self-propelled surface adhering robotically operated vehicle184US 5,947,051 A1999
- Remote unmanned work system (RUWS) electromechanical cable system120US 4,010,619 AThe United States of America as represented by the Secretary of the Navy · 1977
- Underwater power and data relay119US 6,223,675 B1Coflexip · 2001
- Underwater vehicle75US 6,167,831 ACoflexip · 2001
- Method and system for maintenance and servicing of subsea wells70US 4,730,677 AOtis Engineering Corporation · 1988