C02F 9/00
Multistage treatment of water, waste water or sewage
C02F9/00 (Multistage treatment of water, waste water or sewage) appears on 4,179 US grants and 4,718 published applications in this corpus.
Search patents in C02F- Granted patents
- 4,179
- Published applications
- 4,718
- Assignees
- 2,765
- Inventors
- 10,457
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 28 | 0 |
| 1977 | 35 | 0 |
| 1978 | 40 | 0 |
| 1979 | 26 | 0 |
| 1980 | 38 | 0 |
| 1981 | 30 | 0 |
| 1982 | 24 | 0 |
| 1983 | 15 | 0 |
| 1984 | 25 | 0 |
| 1985 | 13 | 0 |
| 1986 | 23 | 0 |
| 1987 | 19 | 0 |
| 1988 | 42 | 0 |
| 1989 | 42 | 0 |
| 1990 | 45 | 0 |
| 1991 | 62 | 0 |
| 1992 | 52 | 0 |
| 1993 | 52 | 0 |
| 1994 | 67 | 0 |
| 1995 | 51 | 0 |
| 1996 | 61 | 0 |
| 1997 | 55 | 0 |
| 1998 | 54 | 0 |
| 1999 | 83 | 0 |
| 2000 | 69 | 0 |
| 2001 | 81 | 17 |
| 2002 | 76 | 79 |
| 2003 | 69 | 129 |
| 2004 | 75 | 120 |
| 2005 | 79 | 161 |
| 2006 | 76 | 139 |
| 2007 | 81 | 134 |
| 2008 | 80 | 123 |
| 2009 | 73 | 162 |
| 2010 | 109 | 173 |
| 2011 | 77 | 149 |
| 2012 | 88 | 162 |
| 2013 | 102 | 188 |
| 2014 | 116 | 197 |
| 2015 | 102 | 183 |
| 2016 | 109 | 190 |
| 2017 | 142 | 188 |
| 2018 | 149 | 218 |
| 2019 | 184 | 243 |
| 2020 | 186 | 234 |
| 2021 | 202 | 298 |
| 2022 | 204 | 261 |
| 2023 | 189 | 262 |
| 2024 | 182 | 269 |
| 2025 | 179 | 226 |
| 2026 | 118 | 213 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Recycling system29 Sep 2026US 12,747,175 B2Abu Dhabi University
- Electrochemical nitrogen and phosphorus removal device and method29 Sep 2026US 12,747,176 B2Beijing Drainage Group Co., Ltd
- Process for in-line mineralisation and carbonation of demineralised water29 Sep 2026US 12,747,177 B2Flamingo Holding SA
- Systems and methods for desalination of liquids22 Sep 2026US 12,741,888 B2Acquolina Il Mondo, LLC
- Efficient nitrogen and phosphorus removal process system for mariculture tail water treatment15 Sep 2026US 12,735,339 B2Tianjin Research Institute for Water Transport Engineering, M.O.T.
- Systems, Methods, and Apparatuses for Producing and Packaging Medical Fluids8 Oct 2026US 2026/0307835 A1
- Method for Treating Phosphorus-Containing Wastewater Produced During Preparation of Sulfonamide Compound8 Oct 2026US 2026/0308035 A1Nanhai Beisha Pharmaceutical Co., Ltd.
- Water treatment apparatus and water treatment method8 Oct 2026US 2026/0308036 A1Meidensha Corporation
- Integrated Ocean Alkalinity Enhancement And Seawater Desalination8 Oct 2026US 2026/0308037 A1Ebb Carbon, Inc.
- Systems, Devices, and Methods for Electrical Generation from Vacuum Distillation1 Oct 2026US 2026/0295457 A1American Water and Energy LLC
Most cited
By later US patents
- Inductively coupled ballast circuit436US 6,825,620 B2Access Business Group International LLC · 2004
- Water treatment system with an inductively coupled ballast432US 6,436,299 B1Amway Corporation · 2002
- Inductively powered lamp assembly370US 6,731,071 B2Access Business Group International LLC · 2004
- Radio frequency identification system for a fluid treatment system361US 6,673,250 B2Access Business Group International LLC · 2004
- Inductively coupled ballast circuit355US 7,385,357 B2Access Business Group International LLC · 2008