E03C 1/288
Having non-return valves against return of waste water
Official title: having non-return valves against return of waste water (E03C1/286 takes precedence)
E03C1/288 (Having non-return valves against return of waste water) appears on 19 US grants and 22 published applications in this corpus.
Search patents in E03C- Granted patents
- 19
- Published applications
- 22
- Assignees
- 15
- Inventors
- 29
- Latest grant
- 9 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 1 | 1 |
| 2010 | 1 | 0 |
| 2011 | 1 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 1 |
| 2016 | 0 | 2 |
| 2017 | 0 | 3 |
| 2018 | 2 | 2 |
| 2019 | 2 | 2 |
| 2020 | 1 | 1 |
| 2021 | 3 | 1 |
| 2022 | 1 | 0 |
| 2023 | 1 | 1 |
| 2024 | 1 | 3 |
| 2025 | 3 | 2 |
By publication year. Applications have been published since 2001.
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Most cited
By later US patents
- Gas-sealing insert for floor drains12US 4,744,109 A1988
- Non-return device8US 7,509,978 B1Hepworth Building Products Limited · 2009
- Drain trap5US 7,976,701 B2Kondoh-FRP Co., Ltd. · 2011
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