E21B 41/0014
Underwater well locating or reentry systems
Official title: {Underwater well locating or reentry systems}
E21B41/0014 (Underwater well locating or reentry systems) appears on 98 US grants and 35 published applications in this corpus.
Search patents in E21B- Granted patents
- 98
- Published applications
- 35
- Assignees
- 66
- Inventors
- 193
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 6 | 0 |
| 1981 | 3 | 0 |
| 1982 | 5 | 0 |
| 1983 | 5 | 0 |
| 1984 | 4 | 0 |
| 1985 | 8 | 0 |
| 1986 | 4 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 5 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 0 |
| 2004 | 1 | 1 |
| 2005 | 1 | 1 |
| 2006 | 1 | 1 |
| 2007 | 1 | 0 |
| 2008 | 0 | 1 |
| 2009 | 2 | 3 |
| 2010 | 1 | 1 |
| 2011 | 0 | 1 |
| 2012 | 1 | 1 |
| 2013 | 0 | 4 |
| 2014 | 1 | 2 |
| 2015 | 3 | 2 |
| 2016 | 2 | 2 |
| 2017 | 2 | 2 |
| 2018 | 1 | 3 |
| 2019 | 2 | 0 |
| 2020 | 1 | 1 |
| 2021 | 1 | 0 |
| 2022 | 2 | 1 |
| 2023 | 0 | 0 |
| 2024 | 2 | 2 |
| 2025 | 0 | 0 |
| 2026 | 3 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Fasteners for an underwater drilling assembly18 Aug 2026US 12,709,366 B2Resolve Marine Group, Inc.
- Frame for an underwater drilling assembly5 May 2026US 12,617,508 B2Resolve Marine Group, Inc.
- Waste cartridge for an underwater drilling assembly28 Apr 2026US 12,612,139 B2Resolve Marine Group, Inc.
- Wellhead system16 Jul 2024US 12,037,863 B2Aker Solutions AS
- Buried wellbore location from surface magnetic measurements2 Jan 2024US 11,860,329 B2Scientific Drilling International, Inc.
- Air-bleed assembly for an underwater drilling assembly25 Jun 2026US 2026/0176927 A1Resolve Marine Group, Inc.
- Frame for an underwater drilling assembly8 Jan 2026US 2026/0008527 A1Resolve Marine Group, Inc.
- Fasteners for an underwater drilling assembly8 Jan 2026US 2026/0008528 A1Resolve Marine Group, Inc.
- Latchable flange for an underwater drilling assembly8 Jan 2026US 2026/0008529 A1Resolve Marine Group, Inc.
- Waste cartridge for an underwater drilling assembly8 Jan 2026US 2026/0008530 A1Resolve Marine Group, Inc.
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
- Method and system for maintenance and servicing of subsea wells70US 4,730,677 AOtis Engineering Corporation · 1988
- Well control method and apparatus49US 4,630,680 AHydril Company · 1986
- Disconnect information and monitoring system for dynamically positioned offshore drilling rigs44US 5,978,739 A1999
- Position determining and dynamic positioning method and system for floating marine well drill platforms and the like39US 4,205,379 ATRW Systems & Energy · 1980