F41A 21/10
Insert barrels, i.e. barrels for firing reduced calibre ammunition and being mounted
Official title: Insert barrels, i.e. barrels for firing reduced calibre ammunition and being mounted within the normal barrels
F41A21/10 (Insert barrels, i.e. barrels for firing reduced calibre ammunition and being mounted) appears on 96 US grants and 64 published applications in this corpus.
Search patents in F41A- Granted patents
- 96
- Published applications
- 64
- Assignees
- 49
- Inventors
- 127
- Latest grant
- 13 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 2 | 0 |
| 2004 | 1 | 1 |
| 2005 | 0 | 2 |
| 2006 | 2 | 1 |
| 2007 | 1 | 1 |
| 2008 | 3 | 3 |
| 2009 | 1 | 1 |
| 2010 | 5 | 3 |
| 2011 | 1 | 5 |
| 2012 | 1 | 3 |
| 2013 | 2 | 3 |
| 2014 | 6 | 3 |
| 2015 | 4 | 2 |
| 2016 | 3 | 4 |
| 2017 | 3 | 3 |
| 2018 | 5 | 2 |
| 2019 | 4 | 4 |
| 2020 | 3 | 5 |
| 2021 | 2 | 4 |
| 2022 | 8 | 7 |
| 2023 | 4 | 1 |
| 2024 | 4 | 2 |
| 2025 | 3 | 2 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Multi-caliber firearm, a bolt and a barrel extension13 Jan 2026US 12,523,437 B2Ensio Firearms Oy
- Reduced weight firearm30 Sep 2025US 12,429,298 B2Patriot Ordance Factory
- Ordnance disarming device17 Jun 2025US 12,332,040 B2Liberty Barrels, Inc.
- Paintball gun barrel with variable sized magna ports11 Mar 2025US 12,247,799 B1
- System for a multi-caliber self-loading action assembly29 Oct 2024US 12,130,108 B2
- System for a multi-caliber self-loading action assembly30 Apr 2026US 2026/0118075 A1
- Device to improve firearm precision26 Mar 2026US 2026/0085905 A1Apertura Ballistics, LLC
- Ordnance disarming device22 May 2025US 2025/0164226 A1Liberty Barrels, Inc.
- Hunting rifle calibre conversion kit and procedure for converting the calibre of said rifle9 Jan 2025US 2025/0012530 A1
- Multi-caliber firearm, a bolt and a barrel extension30 May 2024US 2024/0175652 A1Ensio Firearms Oy
Most cited
By later US patents
- Caliber convertible AR-15 upper receiver system121US 7,444,775 B12008
- Conversion of modern shotguns into muzzleloading shotguns56US 4,437,249 A1984
- Multivalve hypervelocity launcher (MHL)44US 7,775,148 B12010
- Automatic and semiautomatic small caliber conversion system41US 4,098,016 AU.S. Armament Corporation · 1978
- Modified firearms for firing simulated ammunition40US 5,937,563 A1999