C02F 2209/055
Hardness
C02F2209/055 (Hardness) appears on 141 US grants and 226 published applications in this corpus.
Search patents in C02F- Granted patents
- 141
- Published applications
- 226
- Assignees
- 134
- Inventors
- 436
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 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 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 4 |
| 2004 | 0 | 2 |
| 2005 | 2 | 3 |
| 2006 | 0 | 4 |
| 2007 | 0 | 4 |
| 2008 | 3 | 8 |
| 2009 | 3 | 3 |
| 2010 | 4 | 8 |
| 2011 | 2 | 11 |
| 2012 | 5 | 8 |
| 2013 | 8 | 11 |
| 2014 | 7 | 10 |
| 2015 | 3 | 13 |
| 2016 | 4 | 6 |
| 2017 | 7 | 6 |
| 2018 | 9 | 3 |
| 2019 | 7 | 14 |
| 2020 | 6 | 14 |
| 2021 | 14 | 20 |
| 2022 | 11 | 16 |
| 2023 | 6 | 14 |
| 2024 | 17 | 13 |
| 2025 | 13 | 17 |
| 2026 | 7 | 14 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method and apparatus for determining hardness of raw water of water softening device1 Sep 2026US 12,724,019 B2Foshan Midea Chungho Water Purification Equipment Co., Ltd.
- Soft-water system25 Aug 2026US 12,715,795 B2Kyungdong Navien Co., Ltd.
- System and a method for changing color of pool lights11 Aug 2026US 12,705,960 B2Pentair Water Pool and Spa, Inc.
- Multi-sequence water softener system and method10 Mar 2026US 12,570,549 B2
- Methods and systems for treating phosphogypsum-containing water10 Mar 2026US 12,570,559 B2Evoqua Water Technologies LLC
- Method for desalinating liquid20 Aug 2026US 2026/0242257 A1Ming Chi University of Technology
- Antiscalant Compositions and Methods of Use6 Aug 2026US 2026/0226340 A1Locus Solutions Ipco, LLC
- Water softener system and method of operating the same18 Jun 2026US 2026/0166540 A1A. O. Smith Corporation
- System and method for producing a hypochlorous acid-based disinfectant solution11 Jun 2026US 2026/0159968 A1MP Technic
- Systems and methods for extending water filtration membrane lifetime in self-mediated saltless whole home water treatment systems2 Apr 2026US 2026/0091356 A1Pentair Residential Filtration, LLC
Most cited
By later US patents
- Golf course irrigation water monitoring and treatment system204US 6,620,329 B2Turf Sentry, Inc. · 2003
- Sensor device and methods for using same68US 6,958,693 B2Sandia Corporation · 2005
- Indexing controller system and method of automatic control of cooling water tower systems53US 4,464,315 ABetz Entec, Inc. · 1984
- Water electrolyzer38US 5,843,291 AToto Ltd. · 1998
- Water treatment process27US 7,329,358 B2Siemens Water Technologies Holding Corp. · 2008