E04H 4/1236
Bottom drains
Official title: {Bottom drains}
E04H4/1236 (Bottom drains) appears on 134 US grants and 96 published applications in this corpus.
Search patents in E04H- Granted patents
- 134
- Published applications
- 96
- Assignees
- 49
- Inventors
- 135
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 6 | 3 |
| 2002 | 8 | 2 |
| 2003 | 3 | 2 |
| 2004 | 3 | 5 |
| 2005 | 3 | 3 |
| 2006 | 5 | 8 |
| 2007 | 1 | 5 |
| 2008 | 0 | 0 |
| 2009 | 0 | 2 |
| 2010 | 3 | 5 |
| 2011 | 4 | 1 |
| 2012 | 3 | 5 |
| 2013 | 0 | 5 |
| 2014 | 5 | 4 |
| 2015 | 5 | 3 |
| 2016 | 1 | 2 |
| 2017 | 7 | 3 |
| 2018 | 4 | 2 |
| 2019 | 9 | 3 |
| 2020 | 5 | 2 |
| 2021 | 8 | 5 |
| 2022 | 10 | 4 |
| 2023 | 5 | 4 |
| 2024 | 5 | 9 |
| 2025 | 7 | 5 |
| 2026 | 5 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Skimmer to main drain diverter valve15 Sep 2026US 12,736,143 B1Aquastar Pool Products, Inc.
- Programmable pressurized water distribution apparatus for in-floor pool cleaning systems using electrically controlled valves14 Jul 2026US 12,680,328 B2Pool Gazoo
- Overflow system for recreational pools21 Apr 2026US 12,607,027 B2Com Pac Filtration, Inc.
- Drain plug for an above-ground pool31 Mar 2026US 12,590,467 B2Belgravia Wood Limited
- Drain valve for bathroom3 Feb 2026US 12,540,464 B2Guangzhou Rising Dragon Recreation Industrial Co., Ltd.
- System for visual light communication and related methods27 Aug 2026US 2026/0250975 A1Elliptic Works LLC
- Channel Drain Assembly21 May 2026US 2026/0139501 A1Blue Square Manufacturing, LLC
- Docking station systems and methods for pool cleaners5 Feb 2026US 2026/0034908 A1Zodiac Pool Care Europe
- Drain Assembly15 Jan 2026US 2026/0015879 A1Blue Square Manufacturing, LLC
- Reconfigurable spa filter treatment systems and methods for treating filtered water for spas and hot tubs25 Dec 2025US 2025/0389130 A1Saratoga Spa & Bath Co., Inc.
Most cited
By later US patents
- Web-type stock material with upwardly projecting filamentary elements and defined periphery84US 4,671,976 A1987
- Proctective adapter for pool drain79US 4,658,449 A1987
- Main drain safety grate apparatus79US 6,170,095 B22001
- Safety system for multiple drain pools77US 5,894,609 A1999
- Safety suction outlet for pools69US 3,940,807 ABaker Hydro, Inc. · 1976