C02F 1/442
By nanofiltration
Official title: {by nanofiltration}
C02F1/442 (By nanofiltration) appears on 652 US grants and 1,064 published applications in this corpus.
Search patents in C02F- Granted patents
- 652
- Published applications
- 1,064
- Assignees
- 555
- Inventors
- 2,207
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 3 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 5 | 0 |
| 1995 | 4 | 0 |
| 1996 | 3 | 0 |
| 1997 | 5 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 6 | 0 |
| 2001 | 2 | 1 |
| 2002 | 5 | 4 |
| 2003 | 5 | 6 |
| 2004 | 4 | 5 |
| 2005 | 1 | 14 |
| 2006 | 7 | 9 |
| 2007 | 2 | 9 |
| 2008 | 5 | 11 |
| 2009 | 1 | 15 |
| 2010 | 7 | 26 |
| 2011 | 11 | 24 |
| 2012 | 6 | 34 |
| 2013 | 11 | 43 |
| 2014 | 15 | 53 |
| 2015 | 22 | 62 |
| 2016 | 26 | 60 |
| 2017 | 30 | 59 |
| 2018 | 41 | 76 |
| 2019 | 65 | 66 |
| 2020 | 50 | 57 |
| 2021 | 68 | 76 |
| 2022 | 45 | 76 |
| 2023 | 44 | 66 |
| 2024 | 48 | 74 |
| 2025 | 61 | 72 |
| 2026 | 31 | 66 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Thin-film composite membranes synthesized by multi-step coating methods18 Aug 2026US 12,708,881 B2Katholieke Universiteit Leuven
- Method for purifying liquid and system for the implementation thereof11 Aug 2026US 12,702,952 B2Electrophor, Inc.
- All-carbon film based on activated carbon and preparation method and use thereof14 Jul 2026US 12,678,742 B2Zhejiang University
- Seawater desalination system and resourcezation system30 Jun 2026US 12,668,514 B2Zibo Gerui Water Treatment Engineering Co., Ltd.
- Plumbing system and method for purifying drinking water16 Jun 2026US 12,655,047 B2BWT Holding GmbH
- System for determining filter status8 Oct 2026US 2026/0309611 A1
- Compact spiral-wound filter elements, modules and systems24 Sep 2026US 2026/0284600 A1EMD Millipore Corporation
- Method and system for treatment of pfas contaminated wastewater and water utilizing gas nanobubbles24 Sep 2026US 2026/0285708 A1Streamgo Water Solutions Inc.
- Acid-resistant and alkali-resistant composite nanofiltration membrane, and preparation method therefor and use thereof17 Sep 2026US 2026/0273478 A1China Petroleum & Chemical Corporation
- Systems and methods of draw solution recovery with energy saving evaporation supporting forward osmosis membrane crystallization17 Sep 2026US 2026/0274715 A1Fluid Technology Solutions (Fts), Inc.
Most cited
By later US patents
- Installation for making water potable with submerged filtering membranes156US 5,607,593 AOTV Omnium De Trajtements et de Valorisation S.A. · 1997
- Purification of gases from water using reverse osmosis144US 5,670,053 AZenon Environmental Inc. · 1997
- Production of high purity water using reverse osmosis139US 5,766,479 AZenon Environmental Inc. · 1998
- Recovery of carboxylic acids from chemical plant effluents85US 5,635,071 AZenon Airport Enviromental, Inc. · 1997
- Process for desalination of saline water, especially water, having increased product yield and quality85US 6,508,936 B1Saline Water Conversion Corporation · 2003