E04H 4/1209
Treatment of water for swimming pools
Official title: {Treatment of water for swimming pools (filters B01D)}
E04H4/1209 (Treatment of water for swimming pools) appears on 1,079 US grants and 991 published applications in this corpus.
Search patents in E04H- Granted patents
- 1,079
- Published applications
- 991
- Assignees
- 356
- Inventors
- 1,441
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 7 | 0 |
| 1978 | 17 | 0 |
| 1979 | 7 | 0 |
| 1980 | 9 | 0 |
| 1981 | 3 | 0 |
| 1982 | 6 | 0 |
| 1983 | 7 | 0 |
| 1984 | 13 | 0 |
| 1985 | 8 | 0 |
| 1986 | 4 | 0 |
| 1987 | 14 | 0 |
| 1988 | 15 | 0 |
| 1989 | 16 | 0 |
| 1990 | 12 | 0 |
| 1991 | 6 | 0 |
| 1992 | 10 | 0 |
| 1993 | 9 | 0 |
| 1994 | 13 | 0 |
| 1995 | 9 | 0 |
| 1996 | 11 | 0 |
| 1997 | 13 | 0 |
| 1998 | 20 | 0 |
| 1999 | 22 | 0 |
| 2000 | 21 | 0 |
| 2001 | 15 | 3 |
| 2002 | 23 | 17 |
| 2003 | 12 | 13 |
| 2004 | 16 | 27 |
| 2005 | 14 | 18 |
| 2006 | 22 | 34 |
| 2007 | 17 | 25 |
| 2008 | 16 | 28 |
| 2009 | 10 | 24 |
| 2010 | 16 | 22 |
| 2011 | 18 | 22 |
| 2012 | 23 | 28 |
| 2013 | 19 | 33 |
| 2014 | 21 | 41 |
| 2015 | 23 | 41 |
| 2016 | 40 | 44 |
| 2017 | 39 | 66 |
| 2018 | 46 | 43 |
| 2019 | 66 | 57 |
| 2020 | 61 | 52 |
| 2021 | 59 | 60 |
| 2022 | 51 | 54 |
| 2023 | 48 | 60 |
| 2024 | 37 | 54 |
| 2025 | 46 | 55 |
| 2026 | 39 | 70 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Pool skimmer6 Oct 2026US 12,753,619 B1Sichuan Cootway Technology Co., Ltd.
- Cold plunge system with quick release hose-arm29 Sep 2026US 12,747,600 B2
- Pool robot and automatic underwater spreading method29 Sep 2026US 12,747,601 B2Xingmai Innovation Technology (Suzhou) Co., Ltd.
- Flat filter media22 Sep 2026US 12,741,238 B2Bullfrog International, LC
- Skimmer to main drain diverter valve15 Sep 2026US 12,736,143 B1Aquastar Pool Products, Inc.
- Variable speed pumping system and method8 Oct 2026US 2026/0309157 A1Pentair Water Pool and Spa, Inc.
- Debris removal sleeve1 Oct 2026US 2026/0297969 A1
- Variable speed pumping system and method1 Oct 2026US 2026/0298251 A1Pentair Water Pool and Spa, Inc.
- Device body structure and water surface cleaning device17 Sep 2026US 2026/0274713 A1Shenzhen Maining Innovation Technology Co., Ltd.
- Protective drain cap for a drain port of a swimming pool filter unit and method therefor17 Sep 2026US 2026/0275741 A1
Most cited
By later US patents
- Swimming pool management system146US 6,125,481 A2000
- Microprocessor based pump controller for backwashable filter113US 4,676,914 ANorth Coast Systems, Inc. · 1987
- Swimming pool control system having central processing unit and remote communication110US 5,616,239 A1997
- Variable speed pumping system and method105US 7,874,808 B2Pentair Water Pool and Spa, Inc. · 2011
- Liquid pump control104US 4,505,643 ANorth Coast Systems, Inc. · 1985