B01D 2325/022
Asymmetric membranes
B01D2325/022 (Asymmetric membranes) appears on 517 US grants and 598 published applications in this corpus.
Search patents in B01D- Granted patents
- 517
- Published applications
- 598
- Assignees
- 332
- Inventors
- 1,465
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 6 | 0 |
| 1987 | 3 | 0 |
| 1988 | 8 | 0 |
| 1989 | 14 | 0 |
| 1990 | 11 | 0 |
| 1991 | 8 | 0 |
| 1992 | 4 | 0 |
| 1993 | 6 | 0 |
| 1994 | 4 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 6 | 0 |
| 1998 | 10 | 0 |
| 1999 | 16 | 0 |
| 2000 | 8 | 0 |
| 2001 | 5 | 2 |
| 2002 | 8 | 5 |
| 2003 | 7 | 13 |
| 2004 | 9 | 13 |
| 2005 | 8 | 21 |
| 2006 | 4 | 14 |
| 2007 | 14 | 16 |
| 2008 | 10 | 21 |
| 2009 | 12 | 23 |
| 2010 | 13 | 19 |
| 2011 | 10 | 18 |
| 2012 | 19 | 18 |
| 2013 | 13 | 18 |
| 2014 | 17 | 14 |
| 2015 | 11 | 23 |
| 2016 | 17 | 24 |
| 2017 | 20 | 45 |
| 2018 | 13 | 18 |
| 2019 | 28 | 27 |
| 2020 | 34 | 37 |
| 2021 | 23 | 48 |
| 2022 | 21 | 34 |
| 2023 | 23 | 39 |
| 2024 | 29 | 34 |
| 2025 | 18 | 28 |
| 2026 | 14 | 26 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hybrid system and method of waste heat utilization-based photovoltaic power generation and seawater desalination6 Oct 2026US 12,752,240 B2Xi' An Jiaotong University
- Dual-layer hollow fiber membranes and methods of making and use22 Sep 2026US 12,741,269 B2The Regents of the University of Michigan
- Collecting filter and method for manufacturing transparent conducting film using the same11 Aug 2026US 12,702,956 B2Denso Corporation
- Method for preparing a novel guanidine-based composite nanofiltration flat-sheet membrane21 Jul 2026US 12,685,969 B2Tongji University
- Fluid separation membranes and use thereof7 Jul 2026US 12,673,298 B1Semicom Dwc-LLC
- Porous membrane and purification method8 Oct 2026US 2026/0307015 A1Toyobo Co., Ltd.
- Porous hollow fiber membrane and blood purification module24 Sep 2026US 2026/0284607 A1Toray Industries, Inc.
- Polyamide-based mixed matrix membrane for oil-water separation24 Sep 2026US 2026/0286076 A1King Fahd University of Petroleum and Minerals
- Separation membrane, method for manufacturing same, membrane module for at least one of deaeration and aeration, and device for at least one of deaeration and aeration17 Sep 2026US 2026/0273477 A1Toray Industries, Inc.
- Fabrication of membranes via combined evaporation and precipitant induced phase separation10 Sep 2026US 2026/0264022 A1Sartorius Stedim Biotech GmbH
Most cited
By later US patents
- Asymmetric membranes315US 4,629,563 ABrunswick Corporation · 1986
- Process for preparing hydrophilic polyamide membrane filter media and product277US 4,340,479 APall Corporation · 1982
- Process for producing microporous powders and membranes180US 4,968,733 AAkzo N. V. · 1990
- Method of making a product with a micro or nano sized structure and product158US 7,531,120 B2Aquamarijn Holding B.V. · 2009
- Process to form mesostructured films157US 5,858,457 ASandia Corporation · 1999