B01D 53/22
Separation of gases or vapours: by diffusion
Official title: by diffusion (manufacturing semi-permeable membranes B01D67/00; form, structure or properties of semi-permeable membranes B01D69/00; material for semi-permeable membranes B01D71/00)
B01D53/22 (Separation of gases or vapours: by diffusion) appears on 4,023 US grants and 4,347 published applications in this corpus.
Search patents in B01D- Granted patents
- 4,023
- Published applications
- 4,347
- Assignees
- 1,670
- Inventors
- 8,336
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 18 | 0 |
| 1977 | 5 | 0 |
| 1978 | 11 | 0 |
| 1979 | 11 | 0 |
| 1980 | 15 | 0 |
| 1981 | 15 | 0 |
| 1982 | 14 | 0 |
| 1983 | 13 | 0 |
| 1984 | 15 | 0 |
| 1985 | 20 | 0 |
| 1986 | 21 | 0 |
| 1987 | 27 | 0 |
| 1988 | 31 | 0 |
| 1989 | 36 | 0 |
| 1990 | 36 | 0 |
| 1991 | 38 | 0 |
| 1992 | 46 | 0 |
| 1993 | 54 | 0 |
| 1994 | 48 | 0 |
| 1995 | 58 | 0 |
| 1996 | 42 | 0 |
| 1997 | 60 | 0 |
| 1998 | 77 | 0 |
| 1999 | 79 | 0 |
| 2000 | 68 | 0 |
| 2001 | 82 | 18 |
| 2002 | 73 | 78 |
| 2003 | 110 | 97 |
| 2004 | 60 | 111 |
| 2005 | 52 | 102 |
| 2006 | 56 | 98 |
| 2007 | 62 | 117 |
| 2008 | 73 | 103 |
| 2009 | 55 | 111 |
| 2010 | 75 | 136 |
| 2011 | 91 | 154 |
| 2012 | 116 | 152 |
| 2013 | 117 | 185 |
| 2014 | 135 | 188 |
| 2015 | 159 | 226 |
| 2016 | 157 | 236 |
| 2017 | 193 | 231 |
| 2018 | 190 | 220 |
| 2019 | 178 | 239 |
| 2020 | 159 | 229 |
| 2021 | 181 | 234 |
| 2022 | 189 | 216 |
| 2023 | 161 | 193 |
| 2024 | 169 | 243 |
| 2025 | 160 | 224 |
| 2026 | 112 | 206 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hollow fiber microporous membrane, and gas separation membrane module with same built thereinto6 Oct 2026US 12,752,243 B2Toray Industries, Inc.
- Autonomous modular flare gas conversion systems and methods6 Oct 2026US 12,753,138 B2M2X Energy Inc.
- Apparatus for injecting carbon dioxide into underground, method for evaluating same, and method for producing same6 Oct 2026US 12,753,676 B2Kyushu University, National University Corporation
- Mixed gas separation method and mixed gas separation apparatus22 Sep 2026US 12,741,246 B2NGK Insulators, Ltd.
- Carbon molecular sieve membranes based on oxygen-free polymeric precursors22 Sep 2026US 12,741,250 B2King Abdullah University of Science and Technology
- 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
- Modified polyvinylidene fluoride membranes for water filtration8 Oct 2026US 2026/0307011 A1Uchicago Argonne, LLC
- Hollow fiber membrane module8 Oct 2026US 2026/0307014 A1Nok Corporation
- Membrane Supporting Structures8 Oct 2026US 2026/0307017 A1Memzyme, LLC
Most cited
By later US patents
- Electrochemical production of ozone and hydrogen peroxide465US 5,972,196 ALynntech, Inc. · 1999
- Membrane based fuel deoxygenator394US 6,315,815 B1United Technologies Corporation · 2001
- Membranes of polyurethane based materials including polyester polyols364US 6,321,465 B1NIKE, Inc. · 2001
- 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