E03C 1/106
Using two or more check valves
Official title: {using two or more check valves}
E03C1/106 (Using two or more check valves) appears on 148 US grants and 84 published applications in this corpus.
Search patents in E03C- Granted patents
- 148
- Published applications
- 84
- Assignees
- 65
- Inventors
- 170
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 3 | 0 |
| 1980 | 6 | 0 |
| 1981 | 4 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 4 | 0 |
| 1991 | 3 | 0 |
| 1992 | 4 | 0 |
| 1993 | 5 | 0 |
| 1994 | 3 | 0 |
| 1995 | 5 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 3 | 0 |
| 2001 | 4 | 0 |
| 2002 | 3 | 2 |
| 2003 | 3 | 0 |
| 2004 | 2 | 3 |
| 2005 | 2 | 1 |
| 2006 | 3 | 6 |
| 2007 | 2 | 4 |
| 2008 | 1 | 3 |
| 2009 | 0 | 2 |
| 2010 | 3 | 1 |
| 2011 | 2 | 1 |
| 2012 | 1 | 3 |
| 2013 | 0 | 2 |
| 2014 | 3 | 3 |
| 2015 | 0 | 2 |
| 2016 | 6 | 3 |
| 2017 | 7 | 4 |
| 2018 | 1 | 3 |
| 2019 | 4 | 4 |
| 2020 | 3 | 5 |
| 2021 | 5 | 5 |
| 2022 | 4 | 9 |
| 2023 | 9 | 7 |
| 2024 | 6 | 3 |
| 2025 | 2 | 5 |
| 2026 | 4 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Pressure compensation systems, liquid supply systems and methods using the same14 Apr 2026US 12,601,413 B2Watts Regulator Co.
- Modular valve assemblies with optional swing out14 Apr 2026US 12,601,415 B2Australian Valve Group Pty Ltd
- Check cover assemblies for backflow prevention assemblies with integrated test cock protection shroud31 Mar 2026US 12,590,641 B2Watts Regulator Co.
- Backflow alert system24 Mar 2026US 12,584,298 B2Watts Regulator Co.
- Actuated backflow preventer and fluid control apparatus17 Jun 2025US 12,331,495 B2Watts Regulator Co.
- Dedicated monitoring and reporting apparatuses for a backflow preventer (bfp) of a reduced pressure zone (rpz) type, a report apparatus for preventing conversion and predictive maintenance, detecting turbidity in the water, and indicating sanitary condition of the bfp based on data analysis of discharged water with continuous monitoring30 Apr 2026US 2026/0117889 A1
- Wireless backflow alert system9 Apr 2026US 2026/0098594 A1Watts Regulator Co.
- Fluid detection systems and methods using the same19 Mar 2026US 2026/0079067 A1
- Fluid detection systems and methods using the same13 Nov 2025US 2025/0347819 A1Watts Regulator Co.
- Plumbing fixture for a shower system16 Oct 2025US 2025/0320702 A1Grohe AG
Most cited
By later US patents
- Hand spray mounts with integral backflow prevention91US 6,611,971 B1I. W. Industries, Inc. · 2003
- In line back flow preventer82US 4,284,097 AAmtrol Inc. · 1981
- Angle dual check valve77US 5,207,242 AA. Y. McDonald Mgf. Co. · 1993
- Backflow preventer and relief valve assembly72US 3,996,962 ARockwell International Corporation · 1976
- Apparatus and method for automatically disabling pressure relief valve of backflow preventer54US 5,669,405 AAmes Company, Inc. · 1997