E03C 1/294
With provisions against loss of water lock
Official title: with provisions against loss of water lock
E03C1/294 (With provisions against loss of water lock) appears on 41 US grants and 34 published applications in this corpus.
Search patents in E03C- Granted patents
- 41
- Published applications
- 34
- Assignees
- 21
- Inventors
- 62
- Latest grant
- 9 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 3 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 1 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 2 |
| 2008 | 0 | 3 |
| 2009 | 1 | 1 |
| 2010 | 1 | 1 |
| 2011 | 3 | 1 |
| 2012 | 1 | 3 |
| 2013 | 1 | 0 |
| 2014 | 3 | 3 |
| 2015 | 0 | 0 |
| 2016 | 2 | 3 |
| 2017 | 1 | 3 |
| 2018 | 3 | 1 |
| 2019 | 2 | 2 |
| 2020 | 1 | 3 |
| 2021 | 2 | 1 |
| 2022 | 1 | 1 |
| 2023 | 1 | 0 |
| 2024 | 1 | 2 |
| 2025 | 1 | 2 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Drain pipe connector system9 Dec 2025US 12,492,539 B2Physiclean Ltd.
- Positive and negative pressure resistant sealing apparatus of balance shaft two-way valve plate used for drainage pipeline3 Sep 2024US 12,077,957 B1
- Drain pipe connector system15 Aug 2023US 11,725,374 B2Physiclean Ltd.
- Deodorant sewer pipe22 Feb 2022US 11,255,077 B2Jiangmen Surrain Shower Co., Ltd.
- Drain coupler with compressible seal28 Dec 2021US 11,209,108 B2Schluter Systems L. P.
- Occupancy surveillance for plumbing fixtures16 Oct 2025US 2025/0320699 A1Kohler Co.
- Sealing device having positive and negative pressure resistant water seal protection function30 Jan 2025US 2025/0034852 A1
- Positive and negative pressure resistant sealing apparatus of balance shaft two-way valve plate used for drainage pipeline29 Aug 2024US 2024/0287784 A1
- Drain pipe connector system25 Jan 2024US 2024/0026668 A1Physiclean Ltd.
- Deodorant sewer pipe27 Jan 2022US 2022/0025623 A1Jiangmen Surrain Shower Co., Ltd.
Most cited
By later US patents
- Multiple drain trap primer valve assembly for sewer lines96US 5,253,670 AC. H. Perrott, Inc. · 1993
- Dialysis service box26US 8,834,718 B2W.D. Manor Mechanical Contractors, Inc. · 2014
- Water saving trap primer20US 4,218,786 A1980
- Self-contained, automatic primer valve for sewer line drain traps13US 4,204,556 APrecision Plumbing Products, Inc. · 1980
- Venting device13US 4,545,398 A1985