F41A 5/20
Using a gas piston arranged concentrically around the barrel
Official title: using a gas piston arranged concentrically around the barrel
F41A5/20 (Using a gas piston arranged concentrically around the barrel) appears on 60 US grants and 50 published applications in this corpus.
Search patents in F41A- Granted patents
- 60
- Published applications
- 50
- Assignees
- 23
- Inventors
- 69
- Latest grant
- 20 May 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 1 | 1 |
| 2012 | 0 | 2 |
| 2013 | 1 | 1 |
| 2014 | 4 | 4 |
| 2015 | 4 | 8 |
| 2016 | 9 | 6 |
| 2017 | 4 | 2 |
| 2018 | 3 | 3 |
| 2019 | 3 | 4 |
| 2020 | 6 | 5 |
| 2021 | 4 | 4 |
| 2022 | 3 | 4 |
| 2023 | 3 | 2 |
| 2024 | 2 | 1 |
| 2025 | 1 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Self loading firearm bolt carrier with integral carrier key and angled strike face56US 8,387,513 B2LWRC International LLC · 2013
- Self-actuating blow forward firearm54US 5,123,329 A1992
- Electrically-fired and magnetically actuated firearm45US 5,074,189 ALegend Ammunition, Inc. · 1991
- Gas operated mechanism having automatic pressure regulator35US 4,373,423 A1983
- Self loading firearm bolt carrier with integral carrier key and angled strike face32US 8,783,159 B2LWRC International LLC · 2014