C02F 1/68
Treatment of water, waste water, or sewage: by addition of specified substances
Official title: by addition of specified substances, e.g. trace elements, for ameliorating potable water (medicinal water A61K)
C02F1/68 (Treatment of water, waste water, or sewage: by addition of specified substances) appears on 3,309 US grants and 3,697 published applications in this corpus.
Search patents in C02F- Granted patents
- 3,309
- Published applications
- 3,697
- Assignees
- 2,059
- Inventors
- 7,554
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 35 | 0 |
| 1977 | 28 | 0 |
| 1978 | 31 | 0 |
| 1979 | 16 | 0 |
| 1980 | 35 | 0 |
| 1981 | 25 | 0 |
| 1982 | 30 | 0 |
| 1983 | 31 | 0 |
| 1984 | 12 | 0 |
| 1985 | 26 | 0 |
| 1986 | 14 | 0 |
| 1987 | 21 | 0 |
| 1988 | 33 | 0 |
| 1989 | 42 | 0 |
| 1990 | 30 | 0 |
| 1991 | 49 | 0 |
| 1992 | 39 | 0 |
| 1993 | 54 | 0 |
| 1994 | 51 | 0 |
| 1995 | 49 | 0 |
| 1996 | 35 | 0 |
| 1997 | 40 | 0 |
| 1998 | 53 | 0 |
| 1999 | 44 | 0 |
| 2000 | 54 | 0 |
| 2001 | 76 | 14 |
| 2002 | 60 | 74 |
| 2003 | 65 | 83 |
| 2004 | 62 | 103 |
| 2005 | 64 | 127 |
| 2006 | 65 | 122 |
| 2007 | 60 | 110 |
| 2008 | 59 | 120 |
| 2009 | 54 | 124 |
| 2010 | 77 | 136 |
| 2011 | 75 | 127 |
| 2012 | 63 | 151 |
| 2013 | 92 | 151 |
| 2014 | 103 | 175 |
| 2015 | 108 | 185 |
| 2016 | 110 | 143 |
| 2017 | 104 | 162 |
| 2018 | 132 | 172 |
| 2019 | 137 | 182 |
| 2020 | 137 | 189 |
| 2021 | 141 | 205 |
| 2022 | 125 | 170 |
| 2023 | 129 | 187 |
| 2024 | 129 | 164 |
| 2025 | 127 | 171 |
| 2026 | 78 | 150 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Process for in-line mineralisation and carbonation of demineralised water29 Sep 2026US 12,747,177 B2Flamingo Holding SA
- Filter for controlling pH of purified water and water purifier including the same22 Sep 2026US 12,741,892 B2Coway Co., Ltd.
- Enhanced foam fractionation of oil phase from aqueous/oil mixed phase via increased viscoelasticity8 Sep 2026US 12,729,140 B2Ecolab USA Inc.
- Production device for pH/redox potential-adjusted water8 Sep 2026US 12,729,145 B2Kurita Water Industries Ltd.
- Biochar for stable solidification of heavy metals8 Sep 2026US 12,729,162 B2Chinese Research Academy of Environmental Sciences
- Treatment tank Partition System and Methods of Use8 Oct 2026US 2026/0308026 A1Geomatrix Systems, LLC
- Derivatized polyamine polymers for use in metal scavenging applications8 Oct 2026US 2026/0308027 A1Bl Technologies, Inc.
- Water treatment method and water treatment device8 Oct 2026US 2026/0308029 A1Organo Corporation
- Compositions and Methods for Dewatering1 Oct 2026US 2026/0296930 A1Locus Solutions Ipco, LLC
- Water enrichment system1 Oct 2026US 2026/0296931 A1Green Tech Water Ltd
Most cited
By later US patents
- Personal water filter bottle system161US 6,569,329 B1Innova Pure Water Inc. · 2003
- Swimming pool management system146US 6,125,481 A2000
- Diffuser/emulsifier124US 6,386,751 B1Diffusion Dynamics, Inc. · 2002
- Flue gas control system of coal combustion boiler and operating method thereof122US 8,071,060 B2Mitsubishi Heavy Industries, Ltd. · 2011
- Computerized system for feeding chemicals into water treatment system118US 4,648,043 ABetz Laboratories, Inc. · 1987