B63B 41/00
Drop keels
Official title: Drop keels, e.g. centre boards or side boards {; Collapsible keels, or the like, e.g. telescopically; Longitudinally split hinged keels (keels integral with hull B63B3/38; foils or keels on surf-boards B63B32/50; stabilising foils B63B39/06)}
B63B41/00 (Drop keels) appears on 136 US grants and 74 published applications in this corpus.
Search patents in B63B- Granted patents
- 136
- Published applications
- 74
- Assignees
- 46
- Inventors
- 181
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 3 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 6 | 0 |
| 1983 | 7 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 5 | 0 |
| 1988 | 1 | 0 |
| 1989 | 6 | 0 |
| 1990 | 4 | 0 |
| 1991 | 4 | 0 |
| 1992 | 3 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 5 | 0 |
| 1999 | 4 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 1 |
| 2002 | 5 | 3 |
| 2003 | 3 | 1 |
| 2004 | 3 | 3 |
| 2005 | 4 | 5 |
| 2006 | 1 | 4 |
| 2007 | 2 | 2 |
| 2008 | 2 | 3 |
| 2009 | 2 | 3 |
| 2010 | 1 | 7 |
| 2011 | 2 | 1 |
| 2012 | 2 | 6 |
| 2013 | 3 | 2 |
| 2014 | 2 | 2 |
| 2015 | 1 | 2 |
| 2016 | 4 | 4 |
| 2017 | 4 | 3 |
| 2018 | 3 | 5 |
| 2019 | 3 | 3 |
| 2020 | 5 | 4 |
| 2021 | 2 | 2 |
| 2022 | 1 | 0 |
| 2023 | 2 | 2 |
| 2024 | 0 | 5 |
| 2025 | 0 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Floating power generation platform24 Mar 2026US 12,583,560 B2Mighty Waves Energy, LLC.
- Motorized floating picnic table31 Oct 2023US 11,801,921 B2Maine Float LLC
- System for deploying and recovering an autonomous underwater device, method of use11 Jul 2023US 11,697,478 B2Exail
- Floating maritime vessel comprising a detachable measuring keel3 May 2022US 11,319,037 B2Ixblue
- Apparatus and method to optimize sailing efficiency14 Sep 2021US 11,117,642 B2MagnaSail, LLC
- Autonomous roaming offshore wind turbine27 Aug 2026US 2026/0249962 A1Alliance for Sustainable Energy, LLC
- Water board fin provided with a hinge which is self-locking in a stabilizing position and a folded position11 Jul 2024US 2024/0227988 A9Equip Club SA
- Water board fin provided with a hinge which is self-locking in a stabilizing position and a folded position25 Apr 2024US 2024/0132182 A1Equip Club SA
- Autonomous motorised monohull ship with weighted keel transformable into a trimaran21 Mar 2024US 2024/0092463 A1Exail
- Ship14 Mar 2024US 2024/0083547 A1Everblue Technologies Co., LTD.
Most cited
By later US patents