B01J 41/20
Anion exchangers for chromatographic processes
B01J41/20 (Anion exchangers for chromatographic processes) appears on 275 US grants and 288 published applications in this corpus.
Search patents in B01J- Granted patents
- 275
- Published applications
- 288
- Assignees
- 151
- Inventors
- 625
- Latest grant
- 9 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 4 | 0 |
| 1991 | 1 | 0 |
| 1992 | 7 | 0 |
| 1993 | 2 | 0 |
| 1994 | 5 | 0 |
| 1995 | 4 | 0 |
| 1996 | 2 | 0 |
| 1997 | 5 | 0 |
| 1998 | 3 | 0 |
| 1999 | 6 | 0 |
| 2000 | 6 | 0 |
| 2001 | 5 | 2 |
| 2002 | 8 | 11 |
| 2003 | 3 | 6 |
| 2004 | 6 | 10 |
| 2005 | 9 | 16 |
| 2006 | 7 | 12 |
| 2007 | 8 | 10 |
| 2008 | 8 | 5 |
| 2009 | 2 | 8 |
| 2010 | 6 | 10 |
| 2011 | 4 | 12 |
| 2012 | 10 | 11 |
| 2013 | 5 | 8 |
| 2014 | 5 | 13 |
| 2015 | 9 | 10 |
| 2016 | 9 | 13 |
| 2017 | 11 | 17 |
| 2018 | 10 | 18 |
| 2019 | 9 | 20 |
| 2020 | 22 | 11 |
| 2021 | 11 | 20 |
| 2022 | 7 | 12 |
| 2023 | 13 | 6 |
| 2024 | 11 | 8 |
| 2025 | 7 | 12 |
| 2026 | 0 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Scalable purification method for AAV99 Dec 2025US 12,492,385 B2The Trustees of the University of Pennsylvania
- Multi-modal ion-exchange membranes for rapid separations2 Dec 2025US 12,485,364 B2Clemson University Research Foundation
- Method of preparing polymer-filled chromatography resin9 Sep 2025US 12,409,441 B2Bio-Rad Laboratories, Inc.
- Anionic exchange-hydrophobic mixed mode chromatography resin1 Jul 2025US 12,343,702 B2Bio-Rad Laboratories, Inc.
- Polymer particles with a gradient composition and methods of production thereof24 Jun 2025US 12,338,300 B2Waters Technologies Corporation
- A chromatography system, use thereof, and a method for separating adeno-associated capsids13 Aug 2026US 2026/0234571 A1Cytiva BioProcess R&D AB
- Mixed mode charge induction ion exchange (iex) chromatography (mmciic) ligands and methods of use28 May 2026US 2026/0145159 A1Bio-Rad Laboratories, Inc.
- Novel anion-exchange chromatography methods for separation of empty from full recombinant adeno-associated virus particles14 May 2026US 2026/0132385 A1Ultragenyx Pharmaceutical Inc.
- A chromatography device, system, and use thereof for analytic separation16 Apr 2026US 2026/0103685 A1Cytiva BioProcess R&D AB
- Multi-Modal Ion-Exchange Membranes for Rapid Separations12 Mar 2026US 2026/0070002 A1Clemson University
Most cited
By later US patents
- Modified factor VIII132US 4,970,300 ANew York University · 1990
- pH dependent ion exchange matrix and method of use in the isolation of nucleic acids125US 6,310,199 B1Promega Corporation · 2001
- Composite materials comprising supported porous gels116US 7,316,919 B2Nysa Membrane Technologies · 2008
- Polymeric microbeads and method of preparation110US 5,583,162 ABiopore Corporation · 1996
- Porous inorganic/organic hybrid particles for chromatographic separations and process for their preparation94US 6,686,035 B2Waters Investments Limited · 2004