C02F 2209/00
Controlling or monitoring parameters in water treatment
C02F2209/00 (Controlling or monitoring parameters in water treatment) appears on 7,435 US grants and 10,719 published applications in this corpus.
Search patents in C02F- Granted patents
- 7,435
- Published applications
- 10,719
- Assignees
- 4,504
- Inventors
- 18,620
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 14 | 0 |
| 1978 | 20 | 0 |
| 1979 | 12 | 0 |
| 1980 | 7 | 0 |
| 1981 | 11 | 0 |
| 1982 | 10 | 0 |
| 1983 | 9 | 0 |
| 1984 | 12 | 0 |
| 1985 | 7 | 0 |
| 1986 | 9 | 0 |
| 1987 | 11 | 0 |
| 1988 | 12 | 0 |
| 1989 | 9 | 0 |
| 1990 | 14 | 0 |
| 1991 | 19 | 0 |
| 1992 | 24 | 0 |
| 1993 | 23 | 0 |
| 1994 | 37 | 0 |
| 1995 | 33 | 0 |
| 1996 | 37 | 0 |
| 1997 | 29 | 0 |
| 1998 | 48 | 0 |
| 1999 | 75 | 0 |
| 2000 | 58 | 0 |
| 2001 | 114 | 25 |
| 2002 | 129 | 163 |
| 2003 | 136 | 195 |
| 2004 | 126 | 213 |
| 2005 | 114 | 279 |
| 2006 | 110 | 225 |
| 2007 | 135 | 239 |
| 2008 | 150 | 298 |
| 2009 | 144 | 310 |
| 2010 | 223 | 371 |
| 2011 | 188 | 396 |
| 2012 | 209 | 390 |
| 2013 | 243 | 430 |
| 2014 | 260 | 488 |
| 2015 | 248 | 456 |
| 2016 | 257 | 497 |
| 2017 | 339 | 506 |
| 2018 | 344 | 489 |
| 2019 | 416 | 534 |
| 2020 | 442 | 578 |
| 2021 | 431 | 655 |
| 2022 | 487 | 680 |
| 2023 | 429 | 674 |
| 2024 | 457 | 597 |
| 2025 | 469 | 557 |
| 2026 | 289 | 474 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C02F 2209/005Processes using a programmable logic controller [plc]Indexing code2,311
- C02F 2209/40Liquid flow rateIndexing code2,107
- C02F 2209/06PhIndexing code1,957
- C02F 2209/02TemperatureIndexing code1,635
- C02F 2209/03PressureIndexing code1,101
- C02F 2209/42Liquid levelIndexing code1,012
- C02F 2209/05Conductivity or salinityIndexing code975
- C02F 2209/44TimeIndexing code704
All 36 subgroupsShow fewer
- C02F 2209/04Oxidation reduction potential [orp]Indexing code682
- C02F 2209/22O2Indexing code565
- C02F 2209/001Upstream control, i.e. monitoring for predictive controlIndexing code564
- C02F 2209/003Downstream control, i.e. outlet monitoringIndexing code514
- C02F 2209/10SolidsIndexing code489
- C02F 2209/11TurbidityIndexing code463
- C02F 2209/29Chlorine compoundsIndexing code336
- C02F 2209/08Chemical oxygen demand [cod]Indexing code292
- C02F 2209/14Nh3-nIndexing code219
- C02F 2209/38Gas flow rateIndexing code209
- C02F 2209/15N03-nIndexing code185
- C02F 2209/36Biological materialIndexing code174
- C02F 2209/20Total organic carbon [toc]Indexing code166
- C02F 2209/07AlkalinityIndexing code130
- C02F 2209/23O3Indexing code118
- C02F 2209/18Po4-pIndexing code105
- C02F 2209/16Total nitrogenIndexing code77
- C02F 2209/24Co2Indexing code63
- C02F 2209/26H2sIndexing code58
- C02F 2209/09ViscosityIndexing code53
- C02F 2209/01DensityIndexing code47
- C02F 2209/21Dissolved organic carbon [doc]Indexing code28
- C02F 2209/28Ch4Indexing code21
- C02F 2209/30H2Indexing code20
- C02F 2209/19So4-sIndexing code17
- C02F 2209/12Volatile fatty acidsIndexing code13
- C02F 2209/34N2oIndexing code9
- C02F 2209/32CoIndexing code5
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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
- 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
- Apparatus for on-site production of nitrate ions409US 7,514,058 B1The Lata Group, Inc. · 2009
- Radio frequency identification system for a fluid treatment system361US 6,673,250 B2Access Business Group International LLC · 2004