C02F 1/52
Treatment of water, waste water, or sewage: by flocculation or precipitation of
Official title: by flocculation or precipitation of suspended impurities {(C02F1/463 takes precedence)}
C02F1/52 (Treatment of water, waste water, or sewage: by flocculation or precipitation of) appears on 4,939 US grants and 4,464 published applications in this corpus.
Search patents in C02F- Granted patents
- 4,939
- Published applications
- 4,464
- Assignees
- 2,669
- Inventors
- 10,536
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 100 | 0 |
| 1977 | 84 | 0 |
| 1978 | 75 | 0 |
| 1979 | 55 | 0 |
| 1980 | 56 | 0 |
| 1981 | 65 | 0 |
| 1982 | 63 | 0 |
| 1983 | 57 | 0 |
| 1984 | 56 | 0 |
| 1985 | 56 | 0 |
| 1986 | 47 | 0 |
| 1987 | 76 | 0 |
| 1988 | 82 | 0 |
| 1989 | 67 | 0 |
| 1990 | 54 | 0 |
| 1991 | 83 | 0 |
| 1992 | 86 | 0 |
| 1993 | 83 | 0 |
| 1994 | 96 | 0 |
| 1995 | 80 | 0 |
| 1996 | 83 | 0 |
| 1997 | 119 | 0 |
| 1998 | 111 | 0 |
| 1999 | 91 | 0 |
| 2000 | 83 | 0 |
| 2001 | 117 | 21 |
| 2002 | 95 | 86 |
| 2003 | 78 | 121 |
| 2004 | 86 | 131 |
| 2005 | 86 | 116 |
| 2006 | 70 | 123 |
| 2007 | 70 | 107 |
| 2008 | 74 | 128 |
| 2009 | 67 | 141 |
| 2010 | 97 | 177 |
| 2011 | 110 | 177 |
| 2012 | 84 | 174 |
| 2013 | 87 | 190 |
| 2014 | 109 | 248 |
| 2015 | 102 | 241 |
| 2016 | 125 | 205 |
| 2017 | 149 | 251 |
| 2018 | 180 | 192 |
| 2019 | 183 | 238 |
| 2020 | 173 | 209 |
| 2021 | 186 | 244 |
| 2022 | 177 | 197 |
| 2023 | 131 | 198 |
| 2024 | 143 | 196 |
| 2025 | 156 | 201 |
| 2026 | 96 | 152 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C02F 1/5236Using inorganic agents2,115
- C02F 1/54Using organic material2,067
- C02F 1/5281Installations for water purification using chemical agents426
- C02F 2001/5218CrystallizationIndexing code270
- C02F 1/5263Using natural chemical compounds238
- C02F 1/5209Regulation methods for flocculation or precipitation230
- C02F 1/5272Using specific organic precipitants197
- C02F 1/5227Processes for facilitating the dissolution of solid flocculants in water104
All 9 subgroupsShow fewer
Recent patents
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- Method for metal ion removal from metal-containing solution using fluidized bed homogeneous crystallization24 Sep 2026US 2026/0285717 A1National Chunghsing University
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