B01D 69/12
Composite membranes
Official title: Composite membranes; Ultra-thin membranes
B01D69/12 (Composite membranes) appears on 2,393 US grants and 2,984 published applications in this corpus.
Search patents in B01D- Granted patents
- 2,393
- Published applications
- 2,984
- Assignees
- 1,151
- Inventors
- 6,268
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 6 | 0 |
| 1978 | 5 | 0 |
| 1979 | 4 | 0 |
| 1980 | 8 | 0 |
| 1981 | 12 | 0 |
| 1982 | 9 | 0 |
| 1983 | 11 | 0 |
| 1984 | 11 | 0 |
| 1985 | 10 | 0 |
| 1986 | 18 | 0 |
| 1987 | 33 | 0 |
| 1988 | 36 | 0 |
| 1989 | 61 | 0 |
| 1990 | 57 | 0 |
| 1991 | 46 | 0 |
| 1992 | 46 | 0 |
| 1993 | 36 | 0 |
| 1994 | 31 | 0 |
| 1995 | 19 | 0 |
| 1996 | 19 | 0 |
| 1997 | 31 | 0 |
| 1998 | 32 | 0 |
| 1999 | 21 | 0 |
| 2000 | 24 | 0 |
| 2001 | 26 | 8 |
| 2002 | 25 | 33 |
| 2003 | 24 | 47 |
| 2004 | 25 | 56 |
| 2005 | 25 | 43 |
| 2006 | 29 | 53 |
| 2007 | 31 | 58 |
| 2008 | 16 | 67 |
| 2009 | 34 | 71 |
| 2010 | 37 | 85 |
| 2011 | 53 | 84 |
| 2012 | 53 | 94 |
| 2013 | 41 | 111 |
| 2014 | 67 | 130 |
| 2015 | 71 | 165 |
| 2016 | 90 | 158 |
| 2017 | 115 | 182 |
| 2018 | 99 | 157 |
| 2019 | 133 | 158 |
| 2020 | 128 | 195 |
| 2021 | 122 | 175 |
| 2022 | 120 | 165 |
| 2023 | 98 | 199 |
| 2024 | 132 | 198 |
| 2025 | 123 | 160 |
| 2026 | 84 | 132 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- B01D 69/125In situ manufacturing by polymerisation, polycondensation, cross-linking or chemical reaction919
- B01D 69/1216Three or more layers513
- B01D 69/1213Laminated layers346
- B01D 69/1214Chemically bonded layers216
- B01D 69/122Separate manufacturing of ultra-thin membranes128
- B01D 69/1218Layers having the same chemical composition, but different properties105
- B01D 69/1212Coextruded layers78
Recent patents
- Cross-linked mineral membranes6 Oct 2026US 12,752,244 B2Uchicago Argonne, LLC
- Membrane assembly for gas separation, method for producing the membrane assembly and method of separating gases15 Sep 2026US 12,734,487 B2Université De Fribourg
- Method of preparing reverse osmosis membrane with charged hydrogel and polyamide double network8 Sep 2026US 12,728,388 B2
- Palladium-based membrane25 Aug 2026US 12,715,767 B2National University of Singapore
- Composite semipermeable membrane, spiral membrane element, water treatment system, and water treatment method18 Aug 2026US 12,708,880 B2Nitto Denko Corporation
- Membrane-adsorption process for direct air capture8 Oct 2026US 2026/0307001 A1Ohio State Innovation Foundation
- Direct air capture of carbon dioxide with nanofluidic flows8 Oct 2026US 2026/0307002 A1National Technology & Engineering Solutions of Sandia, LLC
- Porous membrane and purification method8 Oct 2026US 2026/0307015 A1Toyobo Co., Ltd.
- Conductive forward osmosis membrane and preparation method thereof8 Oct 2026US 2026/0307018 A1Beijing Baoshengtong International Electrical Engineering Technology Co., Ltd.
- Contorted polyamide membranes and methods of use thereof8 Oct 2026US 2026/0307019 A1University of Houston System
Most cited
By later US patents
- Porous microfabricated polymer membrane structures460US 5,807,406 ABaxter International Inc. · 1998
- 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
- Multicomponent membranes for gas separations355US 4,230,463 AMonsanto Company · 1980
- Hydrogen gas-extraction module and method of fabrication341US 6,152,987 AWorcester Polytechnic Institute · 2000