E21B 41/08
Underwater guide bases
Official title: Underwater guide bases, e.g. drilling templates; Levelling thereof
E21B41/08 (Underwater guide bases) appears on 199 US grants and 104 published applications in this corpus.
Search patents in E21B- Granted patents
- 199
- Published applications
- 104
- Assignees
- 107
- Inventors
- 356
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 7 | 0 |
| 1979 | 5 | 0 |
| 1980 | 5 | 0 |
| 1981 | 5 | 0 |
| 1982 | 2 | 0 |
| 1983 | 4 | 0 |
| 1984 | 10 | 0 |
| 1985 | 3 | 0 |
| 1986 | 8 | 0 |
| 1987 | 9 | 0 |
| 1988 | 12 | 0 |
| 1989 | 7 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 3 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 4 | 0 |
| 2002 | 4 | 0 |
| 2003 | 1 | 5 |
| 2004 | 4 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 2 |
| 2007 | 1 | 2 |
| 2008 | 1 | 2 |
| 2009 | 1 | 3 |
| 2010 | 2 | 4 |
| 2011 | 0 | 3 |
| 2012 | 2 | 2 |
| 2013 | 3 | 5 |
| 2014 | 6 | 4 |
| 2015 | 4 | 4 |
| 2016 | 2 | 2 |
| 2017 | 7 | 2 |
| 2018 | 0 | 13 |
| 2019 | 7 | 9 |
| 2020 | 11 | 8 |
| 2021 | 7 | 6 |
| 2022 | 6 | 7 |
| 2023 | 4 | 9 |
| 2024 | 6 | 4 |
| 2025 | 7 | 4 |
| 2026 | 3 | 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
- Support systems for subsea wellbores28 Jul 2026US 12,692,769 B2Onesubsea, LLC
- System and method for controlling the pressure of fluid in a subterranean void17 Mar 2026US 12,577,854 B2Horisont Energi AS
- Well assembly monitoring2 Dec 2025US 12,486,754 B2Equinor Energy AS
- Subsea wellhead foundation28 Oct 2025US 12,454,803 B2Onesubsea, LLC
- Electrolytic pumping system11 Jun 2026US 2026/0160156 A1
- Support systems for subsea wellbores2 Apr 2026US 2026/0092509 A1Onesubsea, LLC
- Method for providing a subsea template system with a tail pipe and a subsea template system4 Dec 2025US 2025/0369316 A1
- System and method for landing retrievable process module11 Sep 2025US 2025/0283393 A1OneSubsea IP UK Limited
- Seabed connection hub24 Jul 2025US 2025/0236360 A1Reflex Marine Ltd.
Most cited
By later US patents
- Template and process for drilling and completing multiple wells76US 5,330,007 AMarathon Oil Company · 1994
- Subsea oil production system64US 5,025,865 AThe British Petroleum Company p.l.c. · 1991
- Method of forming and servicing wellbores from a main wellbore63US 6,279,658 B1Baker Hughes Incorporated · 2001
- Retrievable exploration guide base/completion guide base system61US 4,611,661 AVetco Offshore Industries, Inc. · 1986
- Subsea template and method for using the same60US 4,822,212 AAmoco Corporation · 1989