F16K 21/04
Self-closing valves, i.e. closing automatically after operation
Official title: Self-closing valves, i.e. closing automatically after operation {(pneumatic tools B25B9/00)}
F16K21/04 (Self-closing valves, i.e. closing automatically after operation) appears on 570 US grants and 412 published applications in this corpus.
Search patents in F16K- Granted patents
- 570
- Published applications
- 412
- Assignees
- 318
- Inventors
- 914
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 14 | 0 |
| 1977 | 8 | 0 |
| 1978 | 7 | 0 |
| 1979 | 6 | 0 |
| 1980 | 11 | 0 |
| 1981 | 11 | 0 |
| 1982 | 8 | 0 |
| 1983 | 3 | 0 |
| 1984 | 12 | 0 |
| 1985 | 11 | 0 |
| 1986 | 18 | 0 |
| 1987 | 14 | 0 |
| 1988 | 9 | 0 |
| 1989 | 8 | 0 |
| 1990 | 13 | 0 |
| 1991 | 9 | 0 |
| 1992 | 10 | 0 |
| 1993 | 5 | 0 |
| 1994 | 4 | 0 |
| 1995 | 11 | 0 |
| 1996 | 4 | 0 |
| 1997 | 4 | 0 |
| 1998 | 6 | 0 |
| 1999 | 6 | 0 |
| 2000 | 6 | 0 |
| 2001 | 7 | 2 |
| 2002 | 6 | 6 |
| 2003 | 7 | 8 |
| 2004 | 10 | 6 |
| 2005 | 3 | 10 |
| 2006 | 8 | 11 |
| 2007 | 10 | 10 |
| 2008 | 5 | 11 |
| 2009 | 4 | 14 |
| 2010 | 7 | 12 |
| 2011 | 9 | 13 |
| 2012 | 9 | 12 |
| 2013 | 7 | 10 |
| 2014 | 14 | 25 |
| 2015 | 16 | 21 |
| 2016 | 20 | 15 |
| 2017 | 21 | 31 |
| 2018 | 15 | 37 |
| 2019 | 27 | 30 |
| 2020 | 34 | 34 |
| 2021 | 34 | 29 |
| 2022 | 22 | 13 |
| 2023 | 18 | 10 |
| 2024 | 15 | 21 |
| 2025 | 18 | 12 |
| 2026 | 6 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F16K 21/18Closed when a rising liquid reaches a predetermined level212
- F16K 21/06In which the closing movement, either retarded or not, starts immediately after142
- F16K 21/16Closing after a predetermined quantity of fluid has been delivered92
- F16K 21/14With special means for preventing the self-closing8
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Most cited
By later US patents
- Low turbulence valve96US 9,416,887 B22016
- Water balloon filling valve82US 5,439,199 AThe National Latex Products Company · 1995
- Flush valves78US 4,272,052 AZurn Industries, LLC · 1981
- Magnetic automatic stop valve73US 6,695,004 B1Alaris Medical Systems, Inc. · 2004
- Diaphragm-type pilot valve having a self-cleaning control orifice69US 5,456,279 ARecurrent Solutions Limited Partnership · 1995