B01D 61/02
Reverse osmosis
Official title: Reverse osmosis; Hyperfiltration {; Nanofiltration}
B01D61/02 (Reverse osmosis) appears on 3,324 US grants and 4,123 published applications in this corpus.
Search patents in B01D- Granted patents
- 3,324
- Published applications
- 4,123
- Assignees
- 1,897
- Inventors
- 8,259
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 13 | 0 |
| 1977 | 11 | 0 |
| 1978 | 16 | 0 |
| 1979 | 22 | 0 |
| 1980 | 18 | 0 |
| 1981 | 12 | 0 |
| 1982 | 16 | 0 |
| 1983 | 13 | 0 |
| 1984 | 15 | 0 |
| 1985 | 17 | 0 |
| 1986 | 29 | 0 |
| 1987 | 24 | 0 |
| 1988 | 37 | 0 |
| 1989 | 36 | 0 |
| 1990 | 27 | 0 |
| 1991 | 47 | 0 |
| 1992 | 53 | 0 |
| 1993 | 50 | 0 |
| 1994 | 38 | 0 |
| 1995 | 36 | 0 |
| 1996 | 52 | 0 |
| 1997 | 52 | 0 |
| 1998 | 51 | 0 |
| 1999 | 53 | 0 |
| 2000 | 57 | 0 |
| 2001 | 58 | 10 |
| 2002 | 46 | 51 |
| 2003 | 46 | 63 |
| 2004 | 34 | 100 |
| 2005 | 35 | 70 |
| 2006 | 35 | 82 |
| 2007 | 38 | 82 |
| 2008 | 39 | 93 |
| 2009 | 47 | 106 |
| 2010 | 58 | 134 |
| 2011 | 64 | 141 |
| 2012 | 69 | 151 |
| 2013 | 75 | 148 |
| 2014 | 93 | 184 |
| 2015 | 91 | 194 |
| 2016 | 101 | 202 |
| 2017 | 109 | 245 |
| 2018 | 150 | 235 |
| 2019 | 193 | 216 |
| 2020 | 187 | 248 |
| 2021 | 182 | 241 |
| 2022 | 166 | 245 |
| 2023 | 153 | 231 |
| 2024 | 161 | 259 |
| 2025 | 181 | 222 |
| 2026 | 118 | 170 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- B01D 61/025Reverse osmosis1,911
- B01D 61/027Nanofiltration909
- B01D 61/08Apparatus therefor708
- B01D 61/12Controlling or regulating658
- B01D 61/10Accessories648
- B01D 61/04Feed pretreatment589
- B01D 61/06Energy recovery276
- B01D 61/029Multistep processes comprising different kinds of membrane processes selected from reverse osmosis180
Recent patents
- Methods of dewatering of alcoholic solutions via forward osmosis and related systems6 Oct 2026US 12,752,239 B2Porifera, Inc.
- Waterflooding system and process to prevent scale precipitation in oil fields6 Oct 2026US 12,753,685 B2Saudi Arabian Oil Company
- Method of forming a cross-linked polymeric membrane29 Sep 2026US 12,746,516 B2Seppure Pte Ltd
- Filter cartridge and water purification system22 Sep 2026US 12,741,249 B2Foshan Micro Midea Filter Mfg. Co., Ltd.
- Intelligent reverse osmosis control22 Sep 2026US 12,741,887 B2Ozono Polaris, S.A. de C.V.
- Concentrated milk protein preparations8 Oct 2026US 2026/0305634 A150G Inc.
- Filtration manifold with integrated bypass8 Oct 2026US 2026/0307010 A1Midea Group Co., Ltd.
- Modified polyvinylidene fluoride membranes for water filtration8 Oct 2026US 2026/0307011 A1Uchicago Argonne, LLC
- Contorted polyamide membranes and methods of use thereof8 Oct 2026US 2026/0307019 A1University of Houston System
- Systems, Methods, and Apparatuses for Producing and Packaging Medical Fluids8 Oct 2026US 2026/0307835 A1
Most cited
By later US patents
- Purification of saline water838US 4,036,749 A1977
- Hot water disinfection of dialysis machines, including the extracorporeal circuit thereof490US 5,591,344 AAksys, Ltd. · 1997
- Fluid separation and delivery apparatus and method279US 6,852,219 B22005
- Peritoneal dialysis system using reverse osmosis purification device260US 5,498,338 AAbbott Laboratories · 1996
- Hemodialysis machine with automatic priming by induced pressure pulses251US 5,863,421 AAksys, Ltd. · 1999