B01D 2325/16
Membrane materials having positively charged functional groups
B01D2325/16 (Membrane materials having positively charged functional groups) appears on 205 US grants and 335 published applications in this corpus.
Search patents in B01D- Granted patents
- 205
- Published applications
- 335
- Assignees
- 191
- Inventors
- 805
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 3 | 1 |
| 2002 | 1 | 2 |
| 2003 | 1 | 4 |
| 2004 | 3 | 5 |
| 2005 | 3 | 4 |
| 2006 | 3 | 4 |
| 2007 | 5 | 4 |
| 2008 | 3 | 8 |
| 2009 | 2 | 10 |
| 2010 | 0 | 10 |
| 2011 | 5 | 10 |
| 2012 | 7 | 7 |
| 2013 | 5 | 13 |
| 2014 | 6 | 13 |
| 2015 | 7 | 13 |
| 2016 | 16 | 16 |
| 2017 | 10 | 13 |
| 2018 | 11 | 25 |
| 2019 | 13 | 21 |
| 2020 | 12 | 28 |
| 2021 | 14 | 22 |
| 2022 | 15 | 23 |
| 2023 | 18 | 15 |
| 2024 | 13 | 22 |
| 2025 | 15 | 29 |
| 2026 | 4 | 13 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Preparation of metallocene containing cationic polymers for anion exchange applications28 Jul 2026US 12,691,419 B2University of South Carolina
- Diffusion transfer functionalized membrane28 Jul 2026US 12,691,420 B2Wisconsin Alumni Research Foundation
- Materials for reducing acids from liquid phases2 Jun 2026US 12,643,971 B2The Board of Trustees of The University of Alabama
- Polymers for use as anion exchange membranes5 May 2026US 12,617,889 B1Envision Energy USA Ltd.
- Membranes for acid-sensitive solvents23 Dec 2025US 12,502,664 B2Entegris, Inc.
- New polymer and anion exchange membrane comprising same23 Jul 2026US 2026/0209454 A1Hanwha Solutions Corporation
- Methods of making lithium selective nanofiltration membranes and their applications2 Jul 2026US 2026/0183723 A1Greenvi Corp.
- Poly(aryl piperidinium) copolymer ionomer grafted with propargyl group, cross-linked anion-exchange membrane, and method for preparing same11 Jun 2026US 2026/0159628 A1Iucf-Hyu (Industry-University Cooperation Foundation Hanyang University)
- Anion exchange membrane and method of preparing the same11 Jun 2026US 2026/0159656 A1Toray Advanced Materials Korea Inc.
- Composition for forming anion exchange polymer, anion exchange membrane and method of manufacturing anion exchange membrane14 May 2026US 2026/0131291 A1Toray Advanced Materials Korea Inc.
Most cited
By later US patents
- Hemostatic system and components for extracorporeal circuit379US 6,733,471 B1Medtronic, Inc. · 2004
- Filtration membranes, and related nano and/or micro fibers, composites, methods and systems254US 10,532,330 B2California Institute of Technology · 2020
- Preparation of crosslinked matrices containing covalently immobilized chemical species and unbound releasable chemical species253US 5,563,056 ABSI Corporation · 1996
- Composite materials comprising supported porous gels116US 7,316,919 B2Nysa Membrane Technologies · 2008
- Microporous membranes and uses thereof103US 6,258,276 B1McMaster University · 2001