E03F 7/04
Valves for preventing return flow
Official title: Valves for preventing return flow {(in gullies, drains or the like E03F5/042)}
E03F7/04 (Valves for preventing return flow) appears on 120 US grants and 91 published applications in this corpus.
Search patents in E03F- Granted patents
- 120
- Published applications
- 91
- Assignees
- 52
- Inventors
- 177
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 4 | 0 |
| 1993 | 3 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 5 | 0 |
| 2001 | 2 | 1 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 1 | 2 |
| 2009 | 0 | 3 |
| 2010 | 0 | 0 |
| 2011 | 2 | 3 |
| 2012 | 1 | 2 |
| 2013 | 2 | 3 |
| 2014 | 2 | 9 |
| 2015 | 3 | 3 |
| 2016 | 4 | 5 |
| 2017 | 5 | 7 |
| 2018 | 10 | 11 |
| 2019 | 7 | 4 |
| 2020 | 7 | 7 |
| 2021 | 0 | 8 |
| 2022 | 7 | 7 |
| 2023 | 8 | 8 |
| 2024 | 10 | 3 |
| 2025 | 2 | 1 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Check cover assemblies for backflow prevention assemblies with integrated test cock protection shroud31 Mar 2026US 12,590,641 B2Watts Regulator Co.
- Systems and methods for backflow management28 Oct 2025US 12,454,821 B2900 Ethan Allen Hwy LLC
- Check valve connector system5 Aug 2025US 12,379,055 B2
- Backwater valve31 Dec 2024US 12,180,695 B2
- Passive backflow prevention apparatus and associated toilet system and method31 Dec 2024US 12,181,056 B2
- Systems and methods for backflow management5 Feb 2026US 2026/0035901 A1900 Ethan Allen Hwy LLC
- Device for troubleshooting, testing, and removing blockages from presssurized sewers5 Feb 2026US 2026/0035902 A1Astm Solutions, LLC
- Tide Gate Check Valve with an Enlarged Integral Annular Wall27 Feb 2025US 2025/0067355 A1Red Valve Company, Inc.
- Positive and negative pressure resistant sealing apparatus of balance shaft two-way valve plate used for drainage pipeline29 Aug 2024US 2024/0287784 A1
- Check valve connector system20 Jun 2024US 2024/0200701 A1
Most cited
By later US patents
- Check valve assembly and method for mounting and installing check valves within a housing73US 5,584,315 AAmes Company, Inc. · 1996
- Spring return check valve63US 6,050,294 AVal-Matic Valve & Manufacturing Corp. · 2000
- Double check backflow preventer with improved toggle linkage check valve47US 5,236,009 AWatts Investment Company · 1993
- Drainage valve having a flexible flap with an edge taper33US 5,020,567 AInnotag Inc. · 1991
- Automatic gate valve shut-off device29US 4,624,280 A1986