B01D 53/225
Multiple stage diffusion
Official title: {Multiple stage diffusion}
B01D53/225 (Multiple stage diffusion) appears on 443 US grants and 484 published applications in this corpus.
Search patents in B01D- Granted patents
- 443
- Published applications
- 484
- Assignees
- 256
- Inventors
- 1,071
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 4 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 6 | 0 |
| 1991 | 4 | 0 |
| 1992 | 4 | 0 |
| 1993 | 9 | 0 |
| 1994 | 7 | 0 |
| 1995 | 13 | 0 |
| 1996 | 6 | 0 |
| 1997 | 4 | 0 |
| 1998 | 6 | 0 |
| 1999 | 8 | 0 |
| 2000 | 8 | 0 |
| 2001 | 5 | 3 |
| 2002 | 9 | 4 |
| 2003 | 9 | 4 |
| 2004 | 4 | 7 |
| 2005 | 4 | 4 |
| 2006 | 2 | 7 |
| 2007 | 0 | 5 |
| 2008 | 3 | 3 |
| 2009 | 3 | 1 |
| 2010 | 1 | 10 |
| 2011 | 7 | 13 |
| 2012 | 3 | 17 |
| 2013 | 13 | 16 |
| 2014 | 12 | 19 |
| 2015 | 11 | 18 |
| 2016 | 16 | 27 |
| 2017 | 19 | 32 |
| 2018 | 21 | 25 |
| 2019 | 28 | 27 |
| 2020 | 17 | 33 |
| 2021 | 25 | 42 |
| 2022 | 34 | 37 |
| 2023 | 24 | 30 |
| 2024 | 20 | 30 |
| 2025 | 38 | 37 |
| 2026 | 16 | 33 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Gas separation system and method for producing methane-enriched gas15 Sep 2026US 12,734,474 B2Ube Corporation
- Membrane permeate recycle with pressurized anaerobic digesters15 Sep 2026US 12,734,475 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- System and method for separating a gas mixture25 Aug 2026US 12,714,968 B2Haffmans B.V.
- CO2 separation systems and methods25 Aug 2026US 12,714,970 B2Carbonquest, Inc.
- Systems for pyrolyzing methane28 Jul 2026US 12,692,153 B1Plan Beta LLC
- Filter assembly for a therapeutic gas delivery device1 Oct 2026US 2026/0295513 A1Mallinckrodt Pharmaceuticals Ireland Limited
- Gas separation membrane module assembly1 Oct 2026US 2026/0295535 A1Honda Motor Co., Ltd.
- Carbon dioxide separation device10 Sep 2026US 2026/0263998 A1Honda Motor Co., Ltd.
- Carbon dioxide separation device10 Sep 2026US 2026/0263999 A1Honda Motor Co., Ltd.
- Carbon dioxide separation device10 Sep 2026US 2026/0264000 A1Honda Motor Co., Ltd.
Most cited
By later US patents
- Composite hydrogen separation element and module185US 5,498,278 ABend Research, Inc. · 1996
- Composite hydrogen separation element and module164US 5,645,626 ABend Research, Inc. · 1997
- Fluid separation apparatus143US 4,451,369 AToyo Boseki Kabushiki Kaisha · 1984
- Process for separating components of a gas stream137US 4,701,187 AAir Products and Chemicals, Inc. · 1987
- Composite hydrogen separation metal membrane129US 5,393,325 ABend Research, Inc. · 1995