C02F 2209/445
Filter life
C02F2209/445 (Filter life) appears on 183 US grants and 259 published applications in this corpus.
Search patents in C02F- Granted patents
- 183
- Published applications
- 259
- Assignees
- 148
- Inventors
- 616
- Latest grant
- 20 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 6 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 7 | 0 |
| 2000 | 3 | 0 |
| 2001 | 5 | 2 |
| 2002 | 4 | 1 |
| 2003 | 1 | 3 |
| 2004 | 1 | 4 |
| 2005 | 1 | 7 |
| 2006 | 1 | 11 |
| 2007 | 4 | 1 |
| 2008 | 1 | 2 |
| 2009 | 2 | 0 |
| 2010 | 2 | 3 |
| 2011 | 0 | 5 |
| 2012 | 0 | 10 |
| 2013 | 7 | 14 |
| 2014 | 4 | 12 |
| 2015 | 3 | 13 |
| 2016 | 7 | 19 |
| 2017 | 13 | 9 |
| 2018 | 8 | 13 |
| 2019 | 18 | 17 |
| 2020 | 12 | 20 |
| 2021 | 19 | 15 |
| 2022 | 13 | 14 |
| 2023 | 6 | 17 |
| 2024 | 8 | 13 |
| 2025 | 12 | 23 |
| 2026 | 2 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Swimming pool filter detection system and method20 Jan 2026US 12,528,036 B2Pentair Water Pool and Spa, Inc.
- Water softener system and method of operating the same6 Jan 2026US 12,515,214 B2A. O. Smith Corporation
- Systems and methods for optimization of connected water devices9 Sep 2025US 12,410,067 B2Pentair, Inc.
- Water treatment systems, devices, and methods for fluid preparation26 Aug 2025US 12,397,094 B2NxStage Medical, Inc.
- Appliance water filter system having memory and authentication functionality26 Aug 2025US 12,397,249 B2Whirlpool Corporation
- System for determining filter status1 Oct 2026US 2026/0296923 A1
- A water treatment cartridge1 Oct 2026US 2026/0296943 A1HCL Technologies Limited
- Self-mediated saltless whole home water treatment systems and methods27 Aug 2026US 2026/0250171 A1Pentair Residential Filtration, LLC
- Advanced Hybrid Eutecto Gels for Water Purification16 Jul 2026US 2026/0200760 A1
- Water faucet and water purification equipment with mineralization25 Jun 2026US 2026/0176162 A1Guangdong Lizi Technology Co., Ltd.
Most cited
By later US patents
- Medicament preparation and treatment devices, methods, and systems259US 10,478,544 B2NxStage Medical, Inc. · 2019
- Water treatment device having means to count times used and limit useage145US 5,190,643 AMr. Coffee, Inc. · 1993
- Water filtering system with replaceable cartridge for a refrigerator138US 6,120,685 AMaytag Corporation · 2000
- Fluid filter assembly130US 5,556,542 AFleetguard, Inc. · 1996
- Water filter cartridge end-of-life mechanism122US 5,882,507 ARecovery Engineering, Inc. · 1999