B01D 2325/0233
With clearly distinguishable layers
Official title: with clearly distinguishable layers
B01D2325/0233 (With clearly distinguishable layers) appears on 66 US grants and 88 published applications in this corpus.
Search patents in B01D- Granted patents
- 66
- Published applications
- 88
- Assignees
- 77
- Inventors
- 293
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 1 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 1 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 3 |
| 2009 | 0 | 4 |
| 2010 | 0 | 5 |
| 2011 | 0 | 5 |
| 2012 | 3 | 3 |
| 2013 | 2 | 2 |
| 2014 | 2 | 1 |
| 2015 | 1 | 1 |
| 2016 | 2 | 3 |
| 2017 | 3 | 4 |
| 2018 | 1 | 4 |
| 2019 | 3 | 5 |
| 2020 | 4 | 9 |
| 2021 | 5 | 10 |
| 2022 | 7 | 9 |
| 2023 | 5 | 5 |
| 2024 | 10 | 7 |
| 2025 | 4 | 2 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- 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
- Large-scale fabrication technique for PIM-1 asymmetric membranes doped with low-molecular-weight polyethylene glycol for gas separation13 Jan 2026US 12,521,681 B2Dalian University of Technology
- Carbon hollow fibre membrane23 Dec 2025US 12,502,645 B2Norwegian University of Science and Technology (Ntnu)
- Asymmetric multiblock copolymer-homopolymer films, methods of making same, and uses thereof23 Sep 2025US 12,420,238 B2Cornell University
- Porous membrane and purification method8 Oct 2026US 2026/0307015 A1Toyobo Co., Ltd.
- Hollow fiber membrane, hollow fiber membrane unit, hollow fiber membrane module, and humidity control machine30 Apr 2026US 2026/0115669 A1Toray Industries, Inc.
- Asymmetric Hollow Fiber Membrane12 Mar 2026US 2026/0070024 A1Solventum Intellectual Properties Company
- Porous polyethylene filter membrane with asymmetric pore structure, and related filters and methods11 Dec 2025US 2025/0375743 A1Entegris, Inc.
- Large-scale fabrication technique for pim-1 asymmetric membranes doped with low-molecular-weight polyethylene glycol for gas separation20 Mar 2025US 2025/0091015 A1Dalian University of Technology
Most cited
By later US patents
- Hollow fiber membrane and braided tubular support therefor135US 6,354,444 B1Zenon Environmental Inc. · 2002
- High flux and low fouling filtration media51US 8,222,166 B2The Research Foundation of State University of New York · 2012
- Multi-layer microfiltration membrane having an integrated prefiltration layer and method of making same48US 5,620,790 ASeitz-Filter-Werke GmbH und Co. · 1997
- Preparation of asymmetric membranes by the solvent extraction of polymer components from polymer blends38US 4,868,222 AThe Dow Chemical Company · 1989
- Asymmetric semipermeable membrane for the treatment of biological fluids35US 5,145,583 AHospal Industrie · 1992