E03C 1/104
Using a single check valve
Official title: {using a single check valve}
E03C1/104 (Using a single check valve) appears on 149 US grants and 85 published applications in this corpus.
Search patents in E03C- Granted patents
- 149
- Published applications
- 85
- Assignees
- 78
- Inventors
- 191
- Latest grant
- 24 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 4 | 0 |
| 1982 | 3 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 5 | 0 |
| 1987 | 4 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 6 | 0 |
| 1992 | 5 | 0 |
| 1993 | 9 | 0 |
| 1994 | 4 | 0 |
| 1995 | 3 | 0 |
| 1996 | 4 | 0 |
| 1997 | 6 | 0 |
| 1998 | 4 | 0 |
| 1999 | 1 | 0 |
| 2000 | 4 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 2 | 0 |
| 2004 | 1 | 6 |
| 2005 | 2 | 0 |
| 2006 | 2 | 8 |
| 2007 | 2 | 2 |
| 2008 | 2 | 6 |
| 2009 | 2 | 4 |
| 2010 | 1 | 1 |
| 2011 | 4 | 2 |
| 2012 | 4 | 2 |
| 2013 | 1 | 5 |
| 2014 | 1 | 2 |
| 2015 | 1 | 4 |
| 2016 | 9 | 6 |
| 2017 | 6 | 3 |
| 2018 | 7 | 7 |
| 2019 | 5 | 3 |
| 2020 | 2 | 6 |
| 2021 | 4 | 8 |
| 2022 | 4 | 5 |
| 2023 | 7 | 2 |
| 2024 | 2 | 2 |
| 2025 | 1 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Check valve with integrated pressure relief valve24 Feb 2026US 12,560,250 B2Neoperl GmbH
- Wireless communication system within a mechanical room11 Feb 2025US 12,221,776 B2Watts Regulator Co.
- Vacuum breaker valve19 Nov 2024US 12,146,599 B2
- Vacuum breaker valve16 Jan 2024US 11,873,912 B1
- Watertight check valve12 Dec 2023US 11,841,087 B2Mueller International, LLC
- Remote air gap assemblies4 Dec 2025US 2025/0369213 A1Kohler Co.
- Vacuum Breaker Valve24 Oct 2024US 2024/0353045 A1
- Wireless communication system within a mechanical room11 Jan 2024US 2024/0011260 A1Watts Regulator Co.
- Check valve with integrated pressure relied valve27 Jul 2023US 2023/0235826 A1Neoperl GmbH
- Watertight check valve1 Jun 2023US 2023/0167913 A1Mueller International, LLC
Most cited
By later US patents
- Tub transfer-diverter valve with built-in vacuum breaker and back-flow preventer105US 4,953,585 ARubinet Brass Canada Limited · 1990
- Sanitary fitting63US 5,090,062 AKwc AG · 1992
- Sanitary fitting55US 5,095,554 AKwc AG · 1992
- Double check backflow preventer with improved toggle linkage check valve47US 5,236,009 AWatts Investment Company · 1993
- Anti-syphon freezeless water hydrant45US 4,475,570 APrier Brass Manufacturing Co. · 1984