C02F 1/00
Treatment of water, waste water, or sewage
Official title: Treatment of water, waste water, or sewage (C02F3/00 - C02F9/00 take precedence)
C02F1/00 (Treatment of water, waste water, or sewage) appears on 33,979 US grants and 36,035 published applications in this corpus.
Search patents in C02F- Granted patents
- 33,979
- Published applications
- 36,035
- Assignees
- 14,165
- Inventors
- 65,553
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 370 | 0 |
| 1977 | 333 | 0 |
| 1978 | 329 | 0 |
| 1979 | 245 | 0 |
| 1980 | 331 | 0 |
| 1981 | 347 | 0 |
| 1982 | 302 | 0 |
| 1983 | 256 | 0 |
| 1984 | 234 | 0 |
| 1985 | 238 | 0 |
| 1986 | 234 | 0 |
| 1987 | 311 | 0 |
| 1988 | 346 | 0 |
| 1989 | 380 | 0 |
| 1990 | 368 | 0 |
| 1991 | 459 | 0 |
| 1992 | 499 | 0 |
| 1993 | 495 | 0 |
| 1994 | 457 | 0 |
| 1995 | 489 | 0 |
| 1996 | 488 | 0 |
| 1997 | 527 | 0 |
| 1998 | 554 | 0 |
| 1999 | 598 | 0 |
| 2000 | 614 | 0 |
| 2001 | 726 | 158 |
| 2002 | 647 | 711 |
| 2003 | 634 | 860 |
| 2004 | 581 | 958 |
| 2005 | 502 | 1025 |
| 2006 | 536 | 1023 |
| 2007 | 561 | 978 |
| 2008 | 564 | 1112 |
| 2009 | 538 | 1115 |
| 2010 | 698 | 1294 |
| 2011 | 656 | 1310 |
| 2012 | 710 | 1348 |
| 2013 | 798 | 1459 |
| 2014 | 897 | 1682 |
| 2015 | 943 | 1680 |
| 2016 | 1012 | 1715 |
| 2017 | 1155 | 1747 |
| 2018 | 1355 | 1793 |
| 2019 | 1472 | 1865 |
| 2020 | 1550 | 2011 |
| 2021 | 1472 | 1934 |
| 2022 | 1373 | 1867 |
| 2023 | 1266 | 1753 |
| 2024 | 1330 | 1739 |
| 2025 | 1355 | 1640 |
| 2026 | 844 | 1258 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C02F 1/72Treatment of water, waste water, or sewage: by oxidation6,478
- C02F 1/28Treatment of water, waste water, or sewage: by sorption5,819
- C02F 1/001Processes for the treatment of water whereby the filtration technique is of5,321
- C02F 1/44Treatment of water, waste water, or sewage: by dialysis, osmosis or reverse5,131
- C02F 1/46Treatment of water, waste water, or sewage: by electrochemical methods5,042
- C02F 1/52Treatment of water, waste water, or sewage: by flocculation or precipitation of4,939
- C02F 1/30Treatment of water, waste water, or sewage: by irradiation3,747
- C02F 1/02Treatment of water, waste water, or sewage: by heating3,538
All 26 subgroupsShow fewer
- C02F 1/68Treatment of water, waste water, or sewage: by addition of specified substances3,309
- C02F 1/66Treatment of water, waste water, or sewage: by neutralisation2,594
- C02F 1/42Treatment of water, waste water, or sewage: by ion-exchange2,530
- C02F 1/008Control or steering systems not provided for elsewhere in subclass c02f2,318
- C02F 1/50Treatment of water, waste water, or sewage: by addition or application of2,088
- C02F 1/20Treatment of water, waste water, or sewage: by degassing, i.e. liberation of1,395
- C02F 1/48Treatment of water, waste water, or sewage: with magnetic or electric fields1,387
- C02F 1/24Treatment of water, waste water, or sewage: by flotation1,124
- C02F 1/40Devices for separating or removing fatty or oily substances or similar floating1,072
- C02F 1/38Treatment of water, waste water, or sewage: by centrifugal separation1,029
- C02F 1/34Treatment of water, waste water, or sewage: with mechanical oscillations848
- C02F 1/70Treatment of water, waste water, or sewage: by reduction848
- C02F 2001/007Processes including a sedimentation stepIndexing code821
- C02F 1/58Treatment of water, waste water, or sewage: by removing specified dissolved compounds680
- C02F 1/006Water distributors either inside a treatment tank or directing the water to561
- C02F 1/26Treatment of water, waste water, or sewage: by extraction555
- C02F 1/22Treatment of water, waste water, or sewage: by freezing263
- C02F 1/005Systems or processes based on supernatural or anthroposophic principles, cosmic or terrestrial210
Recent patents
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- Silica-based nanoparticles for PFAS remediation6 Oct 2026US 12,752,323 B2Regents of the University of Minnesota
- Composite filter and water purifier including same6 Oct 2026US 12,753,091 B2Coway Co., Ltd.
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- Filtration manifold with integrated bypass8 Oct 2026US 2026/0307010 A1Midea Group Co., Ltd.
- Salt-rejecting continuous passive solar thermal desalination via thin-film condensation8 Oct 2026US 2026/0307012 A1The Regents of the University of California
- Contorted polyamide membranes and methods of use thereof8 Oct 2026US 2026/0307019 A1University of Houston System
Most cited
By later US patents
- Methods and systems for improved dosing of a chemical treatment, such as chlorine dioxide, into a fluid stream, such as a wastewater stream595US 6,949,196 B2Fkos, LLC · 2005
- UV-emitting phosphor and lamp containing same525US 7,396,491 B2Osram Sylvania Inc. · 2008
- Hot water disinfection of dialysis machines, including the extracorporeal circuit thereof490US 5,591,344 AAksys, Ltd. · 1997
- Magnetic iron-dextran microspheres466US 4,452,773 ACanadian Patents and Development Limited · 1984
- Electrochemical production of ozone and hydrogen peroxide465US 5,972,196 ALynntech, Inc. · 1999