B01D 2259/40041
With more than three sub-steps
Official title: with more than three sub-steps
B01D2259/40041 (With more than three sub-steps) appears on 73 US grants and 42 published applications in this corpus.
Search patents in B01D- Granted patents
- 73
- Published applications
- 42
- Assignees
- 24
- Inventors
- 135
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 4 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 0 | 0 |
| 2002 | 4 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 5 |
| 2006 | 0 | 2 |
| 2007 | 3 | 2 |
| 2008 | 1 | 1 |
| 2009 | 1 | 4 |
| 2010 | 3 | 1 |
| 2011 | 0 | 1 |
| 2012 | 1 | 4 |
| 2013 | 5 | 3 |
| 2014 | 2 | 2 |
| 2015 | 2 | 0 |
| 2016 | 1 | 1 |
| 2017 | 2 | 2 |
| 2018 | 2 | 1 |
| 2019 | 1 | 4 |
| 2020 | 4 | 2 |
| 2021 | 0 | 2 |
| 2022 | 1 | 1 |
| 2023 | 2 | 1 |
| 2024 | 0 | 1 |
| 2025 | 0 | 1 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Adsorbent material, adsorption system, and adsorption process25 Aug 2026US 12,714,985 B2Air Products and Chemicals, Inc.
- High recovery process for purification of multicomponent gases30 Jun 2026US 12,667,803 B2Praxair Technology, Inc.
- High recovery process for purification of multicomponent gases22 Aug 2023US 11,731,075 B2Praxair Technology, Inc.
- Extremely large pressure swing adsorption processes for flue gas treatment8 Aug 2023US 11,717,786 B2University of South Carolina
- Pressure swing adsorption type hydrogen manufacturing apparatus28 Jun 2022US 11,369,915 B2Osaka Gas Co., Ltd.
- Adsorbent Material, Adsorption System, and Adsorption Process8 May 2025US 2025/0144601 A1Air Products and Chemicals, Inc.
- Method and device for stepwise pressure-equalized pressure swing adsorption (psa) gas separation by changing paths19 Sep 2024US 2024/0307812 A1Shandong Gamma Gas Engineering Co., Ltd.
- High recovery process for purification of multicomponent gases26 Oct 2023US 2023/0338886 A1Praxair Technology, Inc.
- High recovery process for purification of multicomponent gases10 Feb 2022US 2022/0040626 A1Praxair Technology, Inc.
- Extremely Large Pressure Swing Adsorption Processes for Flue Gas Treatment11 Nov 2021US 2021/0346837 A1University of South Carolina
Most cited
By later US patents
- Selective adsorption process139US 3,986,849 AUnion Carbide Corporation · 1976
- Process for the purification of natural gas100US 5,174,796 AUop LLC · 1992
- Pressure swing adsorption process for the production of hydrogen66US 6,340,382 B12002
- Method for treating at least one feed gas mixture by pressure swing adsorption60US 7,255,727 B2L 'Air Liquide-Societe 'Anonyme a 'Directoire et Conseil de Surveillance pour l 'Etude et L'Exploitation des Procedes Georges Claude · 2007
- Recovery of hydrogen and nitrogen from ammonia plant purge gas55US 4,077,780 AUnion Carbide Corporation · 1978