B01D 71/82
Characterised by the presence of specified groups
Official title: characterised by the presence of specified groups, e.g. introduced by chemical after-treatment
B01D71/82 (Characterised by the presence of specified groups) appears on 616 US grants and 863 published applications in this corpus.
Search patents in B01D- Granted patents
- 616
- Published applications
- 863
- Assignees
- 451
- Inventors
- 1,993
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 4 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 4 | 0 |
| 1988 | 4 | 0 |
| 1989 | 4 | 0 |
| 1990 | 8 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 3 |
| 2002 | 9 | 13 |
| 2003 | 8 | 16 |
| 2004 | 8 | 19 |
| 2005 | 9 | 27 |
| 2006 | 10 | 34 |
| 2007 | 14 | 20 |
| 2008 | 14 | 19 |
| 2009 | 10 | 30 |
| 2010 | 20 | 37 |
| 2011 | 24 | 34 |
| 2012 | 14 | 22 |
| 2013 | 29 | 35 |
| 2014 | 25 | 37 |
| 2015 | 29 | 36 |
| 2016 | 29 | 32 |
| 2017 | 28 | 46 |
| 2018 | 27 | 32 |
| 2019 | 27 | 41 |
| 2020 | 33 | 56 |
| 2021 | 34 | 58 |
| 2022 | 35 | 38 |
| 2023 | 40 | 50 |
| 2024 | 34 | 56 |
| 2025 | 35 | 42 |
| 2026 | 16 | 30 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method of preparing reverse osmosis membrane with charged hydrogel and polyamide double network8 Sep 2026US 12,728,388 B2
- Semiconductive and proton-conductive porous hydrogen-bonded frameworks4 Aug 2026US 12,697,593 B2Technische UniversitäT Berlin
- Preparation of metallocene containing cationic polymers for anion exchange applications28 Jul 2026US 12,691,419 B2University of South Carolina
- Sulfonated polymers and compositions thereof26 May 2026US 12,637,532 B2Kraton Corporation
- Compounds, compositions and polymer films19 May 2026US 12,630,502 B2FUJIFILM Corporation
- Cationic Compounds for Anion Exchange Membranes3 Sep 2026US 2026/0257990 A1Agfa-Gevaert
- Ion permeable membrane20 Aug 2026US 2026/0242230 A1Idemitsu Kosan Co., Ltd.
- Ceramic cation exchange materials13 Aug 2026US 2026/0233171 A1Membrion, Inc.
- Composite semipermeable membrane, composite semipermeable membrane module, fluid separation device, and method for producing composite semipermeable membrane6 Aug 2026US 2026/0225045 A1Toray Industries, Inc.
- Highly porous polymer nanofilms6 Aug 2026US 2026/0225070 A1Massachusetts Institute of Technology
Most cited
By later US patents
- Functional, photochemically active, and chemically asymmetric membranes by interfacial polymerization of derivatized multifunctional prepolymers410US 4,784,736 ABend Research, Inc. · 1988
- Functional, photochemically active, and chemically asymmetric membranes by interfacial polymerization of derivatized multifunctional prepolymers370US 4,917,800 ABend Research, Inc. · 1990
- Composite solid polymer electrolyte membranes346US 7,550,216 B2Foster-Miller, Inc. · 2009
- Novel protein-immobilizing hydrophobic polymeric membrane, process for producing same and apparatus employing same285US 3,966,580 AUniversity of Utah · 1976
- Filtration membranes, and related nano and/or micro fibers, composites, methods and systems254US 10,532,330 B2California Institute of Technology · 2020