F16K 31/1221
One side of the piston being spring-loaded
Official title: {one side of the piston being spring-loaded}
F16K31/1221 (One side of the piston being spring-loaded) appears on 849 US grants and 880 published applications in this corpus.
Search patents in F16K- Granted patents
- 849
- Published applications
- 880
- Assignees
- 483
- Inventors
- 1,559
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 4 | 0 |
| 1978 | 5 | 0 |
| 1979 | 0 | 0 |
| 1980 | 11 | 0 |
| 1981 | 5 | 0 |
| 1982 | 3 | 0 |
| 1983 | 4 | 0 |
| 1984 | 7 | 0 |
| 1985 | 6 | 0 |
| 1986 | 7 | 0 |
| 1987 | 5 | 0 |
| 1988 | 6 | 0 |
| 1989 | 11 | 0 |
| 1990 | 6 | 0 |
| 1991 | 8 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 4 | 0 |
| 1996 | 2 | 0 |
| 1997 | 5 | 0 |
| 1998 | 3 | 0 |
| 1999 | 11 | 0 |
| 2000 | 14 | 0 |
| 2001 | 8 | 10 |
| 2002 | 8 | 17 |
| 2003 | 22 | 13 |
| 2004 | 9 | 13 |
| 2005 | 3 | 8 |
| 2006 | 11 | 15 |
| 2007 | 8 | 10 |
| 2008 | 9 | 11 |
| 2009 | 3 | 14 |
| 2010 | 9 | 20 |
| 2011 | 10 | 16 |
| 2012 | 8 | 10 |
| 2013 | 18 | 25 |
| 2014 | 21 | 30 |
| 2015 | 23 | 37 |
| 2016 | 25 | 50 |
| 2017 | 41 | 70 |
| 2018 | 41 | 79 |
| 2019 | 76 | 71 |
| 2020 | 62 | 73 |
| 2021 | 72 | 60 |
| 2022 | 55 | 49 |
| 2023 | 48 | 54 |
| 2024 | 62 | 41 |
| 2025 | 35 | 55 |
| 2026 | 27 | 29 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Film processing system434US 6,296,711 B1CVD Systems, Inc. · 2001
- Safety shut-off valve98US 3,958,592 AWillis Oil Tool Co. · 1976
- Expanding gate valve with pneumatic actuator73US 4,585,207 AJoy Manufacturing Company · 1986
- Dual-pressure hydraulic valve-actuation system70US 6,067,946 ACummins Engine Company, Inc. · 2000
- Subsea valve actuator and method69US 6,041,804 A2000