F41A 9/71
Arrangements thereon for varying capacity
Official title: Arrangements thereon for varying capacity; Adapters or inserts for changing cartridge size or type
F41A9/71 (Arrangements thereon for varying capacity) appears on 135 US grants and 124 published applications in this corpus.
Search patents in F41A- Granted patents
- 135
- Published applications
- 124
- Assignees
- 68
- Inventors
- 203
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 2 | 2 |
| 2009 | 1 | 0 |
| 2010 | 3 | 4 |
| 2011 | 2 | 2 |
| 2012 | 1 | 6 |
| 2013 | 4 | 5 |
| 2014 | 10 | 4 |
| 2015 | 5 | 7 |
| 2016 | 11 | 6 |
| 2017 | 4 | 10 |
| 2018 | 8 | 6 |
| 2019 | 8 | 7 |
| 2020 | 7 | 10 |
| 2021 | 15 | 14 |
| 2022 | 3 | 5 |
| 2023 | 9 | 18 |
| 2024 | 13 | 4 |
| 2025 | 8 | 8 |
| 2026 | 3 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Increased capacity ammunition magazine29 Sep 2026US 12,747,921 B2Shield Arms, LLC
- Ammunition convertible firearm20 Jan 2026US 12,529,535 B2Ares Defense Systems, Inc.
- Magazine extension13 Jan 2026US 12,523,436 B2Shadow Systems LLC
- Magazine base pad2 Dec 2025US 12,487,041 B2Grip Force LLC
- Density altitude reticle14 Oct 2025US 12,442,604 B2Outlier IP, LLC
- Modified ammunition magazine and weapon magazine well24 Sep 2026US 2026/0287289 A1The United States of America as represented by the Secretary of the Navy
- Ammunition convertible firearm16 Jul 2026US 2026/0202154 A1Ares Defense Systems, Inc.
- Apparatus and method for readily changing calibers of blind box magazine firearms30 Apr 2026US 2026/0118077 A1
- Polymer firearm magazine width retention system23 Apr 2026US 2026/0110508 A1Sturm, Ruger & Company, Inc.
- Firearm bottom metal13 Nov 2025US 2025/0347482 A1Springfield, Inc.
Most cited
By later US patents
- Caliber convertible AR-15 upper receiver system121US 7,444,775 B12008
- Rifle adapter assembly75US 4,058,922 AThe United States of America as represented by the Secretary of the Army · 1977
- Length-variable magazine73US 5,113,605 ADae Sam Co., Ltd. · 1992
- Hand gun magazine extension assembly65US 5,666,752 A1997
- Modular firearm stock system62US 8,429,844 B2Cadex, Inc. · 2013