C02F 2209/42
Liquid level
C02F2209/42 (Liquid level) appears on 1,012 US grants and 1,393 published applications in this corpus.
Search patents in C02F- Granted patents
- 1,012
- Published applications
- 1,393
- Assignees
- 822
- Inventors
- 2,734
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 5 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 4 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 7 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 7 | 0 |
| 1995 | 5 | 0 |
| 1996 | 6 | 0 |
| 1997 | 5 | 0 |
| 1998 | 9 | 0 |
| 1999 | 13 | 0 |
| 2000 | 8 | 0 |
| 2001 | 20 | 4 |
| 2002 | 22 | 24 |
| 2003 | 21 | 31 |
| 2004 | 17 | 30 |
| 2005 | 19 | 45 |
| 2006 | 19 | 34 |
| 2007 | 20 | 28 |
| 2008 | 16 | 42 |
| 2009 | 16 | 50 |
| 2010 | 35 | 52 |
| 2011 | 23 | 46 |
| 2012 | 28 | 55 |
| 2013 | 23 | 49 |
| 2014 | 33 | 51 |
| 2015 | 35 | 55 |
| 2016 | 22 | 60 |
| 2017 | 43 | 58 |
| 2018 | 40 | 69 |
| 2019 | 58 | 75 |
| 2020 | 68 | 71 |
| 2021 | 49 | 101 |
| 2022 | 71 | 88 |
| 2023 | 70 | 90 |
| 2024 | 64 | 71 |
| 2025 | 52 | 51 |
| 2026 | 37 | 63 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Device for influent distribution and thickened sludge fermentation to enhance MSBR system6 Oct 2026US 12,753,100 B2Corstar Environmental Equipment Shanghai Ltd
- Ultrasonic scaler having an ozonated water system8 Sep 2026US 12,729,141 B2DENTSPLY SIRONA Inc.
- Drainage treatment system and drainage treatment method18 Aug 2026US 12,709,555 B2Hitachi, Ltd.
- Dewatering apparatus, systems, and methods18 Aug 2026US 12,709,558 B2Saudi Arabian Oil Company
- Continuous in-situ therapeutic treatment system for fish in freshwater, from seawater4 Aug 2026US 12,696,881 B2Salmoclinic Spa
- Self-managed water purifier8 Oct 2026US 2026/0308016 A1Coway Co., Ltd.
- Operation method of water treatment apparatus and water treatment apparatus8 Oct 2026US 2026/0308031 A1Kubota Corporation
- A water treatment cartridge1 Oct 2026US 2026/0296943 A1HCL Technologies Limited
- Dynamic control of lithium production facility using model predictive controller1 Oct 2026US 2026/0297703 A1ExxonMobil Technology and Engineering Company
- Interfacial evaporation device for evaporation ponds24 Sep 2026US 2026/0284547 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Portable, potable water recovery and dispensing apparatus198US 6,182,453 B2Worldwide Water, Inc. · 2001
- Portable, potable water recovery and dispensing apparatus121US 6,058,718 A2000
- Hand-held ultraviolet water purification system using solid state devices102US 6,579,495 B1Hydro-Photon, Inc. · 2003
- Surface functionalized mesoporous material and method of making same91US 6,326,326 B1Battelle Memorial Institute · 2001
- Water reuse system89US 4,162,218 A1979