C23F 2213/31
Immersed structures
Official title: Immersed structures, e.g. submarine structures
C23F2213/31 (Immersed structures) appears on 148 US grants and 149 published applications in this corpus.
Search patents in C23F- Granted patents
- 148
- Published applications
- 149
- Assignees
- 110
- Inventors
- 317
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 3 | 0 |
| 2002 | 1 | 2 |
| 2003 | 1 | 0 |
| 2004 | 3 | 3 |
| 2005 | 1 | 2 |
| 2006 | 4 | 3 |
| 2007 | 4 | 5 |
| 2008 | 6 | 6 |
| 2009 | 3 | 2 |
| 2010 | 3 | 1 |
| 2011 | 3 | 6 |
| 2012 | 6 | 7 |
| 2013 | 5 | 6 |
| 2014 | 4 | 5 |
| 2015 | 4 | 9 |
| 2016 | 7 | 4 |
| 2017 | 8 | 4 |
| 2018 | 4 | 13 |
| 2019 | 10 | 9 |
| 2020 | 4 | 14 |
| 2021 | 9 | 10 |
| 2022 | 8 | 5 |
| 2023 | 10 | 7 |
| 2024 | 7 | 12 |
| 2025 | 6 | 12 |
| 2026 | 4 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Device for the cathodic protection of metal components of boats8 Sep 2026US 12,729,444 B2
- Propeller arrangement in a cathodic protection system26 May 2026US 12,637,774 B2AB Volvo Penta
- Gravity-contact sacrificial anode12 May 2026US 12,624,458 B2Petroleo Brasileiro S.A. - Petrobras
- Shaft contact device5 May 2026US 12,620,300 B2Waynedd Enterprises Ltd
- Impressed current cathodic protection system and a method of operating the system11 Nov 2025US 12,467,148 B2AB Volvo Penta
- Method and anode mount for mounting an iccp anode on an offshore construction18 Jun 2026US 2026/0168110 A1
- A measuring unit19 Mar 2026US 2026/0079097 A1AB Volvo Penta
- Method and system for corrosion protection11 Dec 2025US 2025/0377286 A1Deakin University
- Autonomous underwater vehicle20 Nov 2025US 2025/0354957 A1Kawasaki Jukogyo Kabushiki Kaisha
- Fpso external anti-corrosion device6 Nov 2025US 2025/0341000 A1Dalian Kingmile Marine Technology Co.,Ltd.
Most cited
By later US patents
- Subsea clamping apparatus69US 4,705,331 AWayne Graham & Associates International, Inc. · 1987
- Assemblies and methods for monitoring cathodic protection of structures34US 11,447,877 B1Marathon Petroleum Company LP · 2022
- Method of installing an unbonded flexible pipe28US 10,513,896 B2National Oilwell Varco Denmark I/S · 2019
- Assemblies and methods for monitoring cathodic protection of structures28US 11,807,945 B2Marathon Petroleum Company LP · 2023
- Marine galvanic protection monitor28US 6,183,625 B2Brunswick Corporation · 2001