B63B 21/30
Rigid when in use
Official title: rigid when in use {(B63B21/28 takes precedence)}
B63B21/30 (Rigid when in use) appears on 108 US grants and 75 published applications in this corpus.
Search patents in B63B- Granted patents
- 108
- Published applications
- 75
- Assignees
- 43
- Inventors
- 168
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 4 | 0 |
| 2000 | 8 | 0 |
| 2001 | 7 | 0 |
| 2002 | 2 | 0 |
| 2003 | 3 | 5 |
| 2004 | 1 | 2 |
| 2005 | 5 | 4 |
| 2006 | 1 | 0 |
| 2007 | 2 | 1 |
| 2008 | 1 | 1 |
| 2009 | 0 | 1 |
| 2010 | 1 | 3 |
| 2011 | 0 | 4 |
| 2012 | 2 | 1 |
| 2013 | 2 | 6 |
| 2014 | 3 | 4 |
| 2015 | 6 | 4 |
| 2016 | 0 | 1 |
| 2017 | 6 | 6 |
| 2018 | 5 | 5 |
| 2019 | 4 | 4 |
| 2020 | 4 | 1 |
| 2021 | 0 | 6 |
| 2022 | 5 | 5 |
| 2023 | 4 | 3 |
| 2024 | 5 | 4 |
| 2025 | 1 | 3 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Retrofittable anchor retrieval accessory8 Sep 2026US 12,728,958 B1
- Fluid flow control system30 Jun 2026US 12,668,329 B1IL Marine Systems, Inc.
- Weak soil anchor device to anchor one or several structures and method to arrange an anchor in weak soil1 Jul 2025US 12,345,012 B2Dr. Techn. Olav Olsen AS
- Portable marine anchoring device1 Oct 2024US 12,103,645 B2WavesRX, LLC
- Emissions control watercraft27 Aug 2024US 12,071,205 B2
- Nautical anchor1 Jan 2026US 2026/0001623 A1
- Module and system for improved retrieval of a stuck anchor25 Dec 2025US 2025/0388294 A1Fundacao Noras
- Boat anchor and winch assembly2 Oct 2025US 2025/0304215 A1Lone Star Marine Pty Ltd
- Seabed connection hub24 Jul 2025US 2025/0236360 A1Reflex Marine Ltd.
- Emissions control watercraft7 Nov 2024US 2024/0367762 A1STAX Engineering, Inc.
Most cited
By later US patents
- Anchoring and operating device for a watercraft33US 6,220,197 B12001
- Adjustable boat anchor18US 5,188,055 A1993
- Anchors and anchoring system13US 4,173,938 AConstructions Metalliques de Provence · 1979
- Anchor13US 6,082,284 AVrijhof Ankers Beheer B.V. · 2000
- Anchor for heavy loads12US 5,353,732 ASingle Buoy Moorings Inc. · 1994