C02F 5/00
Softening water
Official title: Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents (softening using ion-exchange C02F1/42)
C02F5/00 (Softening water) appears on 2,345 US grants and 1,856 published applications in this corpus.
Search patents in C02F- Granted patents
- 2,345
- Published applications
- 1,856
- Assignees
- 958
- Inventors
- 4,352
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 51 | 0 |
| 1977 | 54 | 0 |
| 1978 | 49 | 0 |
| 1979 | 31 | 0 |
| 1980 | 27 | 0 |
| 1981 | 38 | 0 |
| 1982 | 32 | 0 |
| 1983 | 27 | 0 |
| 1984 | 42 | 0 |
| 1985 | 48 | 0 |
| 1986 | 38 | 0 |
| 1987 | 56 | 0 |
| 1988 | 33 | 0 |
| 1989 | 59 | 0 |
| 1990 | 59 | 0 |
| 1991 | 45 | 0 |
| 1992 | 49 | 0 |
| 1993 | 45 | 0 |
| 1994 | 46 | 0 |
| 1995 | 44 | 0 |
| 1996 | 37 | 0 |
| 1997 | 56 | 0 |
| 1998 | 43 | 0 |
| 1999 | 43 | 0 |
| 2000 | 38 | 0 |
| 2001 | 45 | 11 |
| 2002 | 46 | 43 |
| 2003 | 38 | 48 |
| 2004 | 21 | 60 |
| 2005 | 25 | 51 |
| 2006 | 33 | 41 |
| 2007 | 19 | 56 |
| 2008 | 28 | 67 |
| 2009 | 20 | 63 |
| 2010 | 42 | 78 |
| 2011 | 55 | 87 |
| 2012 | 39 | 77 |
| 2013 | 43 | 96 |
| 2014 | 56 | 96 |
| 2015 | 55 | 94 |
| 2016 | 63 | 103 |
| 2017 | 55 | 77 |
| 2018 | 62 | 74 |
| 2019 | 74 | 81 |
| 2020 | 89 | 87 |
| 2021 | 71 | 93 |
| 2022 | 54 | 72 |
| 2023 | 69 | 91 |
| 2024 | 66 | 68 |
| 2025 | 51 | 82 |
| 2026 | 36 | 60 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Systems and methods for desalination of liquids22 Sep 2026US 12,741,888 B2Acquolina Il Mondo, LLC
- Aqueous formulation of oil-soluble corrosion inhibitor, and preparation method and regeneration method thereof22 Sep 2026US 12,742,119 B2PetroChina Company Limited
- Wastewater processing system and apparatus8 Sep 2026US 12,729,138 B2Skagen Energy Services Inc.
- Soft-water system25 Aug 2026US 12,715,795 B2Kyungdong Navien Co., Ltd.
- Process for removing hardness and total organic carbon from drinking water25 Aug 2026US 12,715,796 B2Veolia Water Solutions & Technologies Support
- Utilization of an ultra-high pressure reverse osmosis membrane system to treat industrial wastewater or a reverse osmosis reject waste stream8 Oct 2026US 2026/0308017 A1Renovo Resources LLC
- Method for Complete Sulfate and Metal Removal from Produced Water Using a Three-Step Treatment Process for Reinjection8 Oct 2026US 2026/0308034 A1Molecular Filtration, Inc.
- Ice maker appliance scale cartridge1 Oct 2026US 2026/0296940 A1Haier US Appliance Solutions, Inc.
- A water treatment cartridge1 Oct 2026US 2026/0296943 A1HCL Technologies Limited
- Method of Inhibiting Corrosion of a Metal in an Industrial Water System1 Oct 2026US 2026/0297758 A1Ecolab USA Inc.
Most cited
By later US patents
- Purification of saline water838US 4,036,749 A1977
- Use of crystalline layered sodium silicates for softening water and a process for softening water187US 4,664,839 AHoechst Aktiengesellschaft · 1987
- System and method for detecting time-bomb malware168US 9,536,091 B2FireEye, Inc. · 2017
- System and method for detecting time-bomb malware153US 10,083,302 B1FireEye, Inc. · 2018
- Synergistic scale and corrosion inhibiting admixtures containing carboxylic acid/sulfonic acid polymers144US 4,640,793 ACalgon Corporation · 1987