B01D 2259/4005
Nature of purge gas
B01D2259/4005 (Nature of purge gas) appears on 586 US grants and 371 published applications in this corpus.
Search patents in B01D- Granted patents
- 586
- Published applications
- 371
- Assignees
- 228
- Inventors
- 1,071
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 4 | 0 |
| 1978 | 6 | 0 |
| 1979 | 3 | 0 |
| 1980 | 5 | 0 |
| 1981 | 3 | 0 |
| 1982 | 6 | 0 |
| 1983 | 12 | 0 |
| 1984 | 11 | 0 |
| 1985 | 10 | 0 |
| 1986 | 6 | 0 |
| 1987 | 12 | 0 |
| 1988 | 17 | 0 |
| 1989 | 9 | 0 |
| 1990 | 13 | 0 |
| 1991 | 6 | 0 |
| 1992 | 16 | 0 |
| 1993 | 16 | 0 |
| 1994 | 3 | 0 |
| 1995 | 7 | 0 |
| 1996 | 12 | 0 |
| 1997 | 12 | 0 |
| 1998 | 14 | 0 |
| 1999 | 25 | 0 |
| 2000 | 23 | 0 |
| 2001 | 18 | 2 |
| 2002 | 14 | 11 |
| 2003 | 16 | 14 |
| 2004 | 8 | 13 |
| 2005 | 10 | 30 |
| 2006 | 9 | 13 |
| 2007 | 13 | 12 |
| 2008 | 12 | 7 |
| 2009 | 6 | 11 |
| 2010 | 11 | 10 |
| 2011 | 4 | 10 |
| 2012 | 12 | 15 |
| 2013 | 12 | 12 |
| 2014 | 15 | 10 |
| 2015 | 10 | 11 |
| 2016 | 13 | 14 |
| 2017 | 11 | 31 |
| 2018 | 19 | 20 |
| 2019 | 23 | 19 |
| 2020 | 20 | 20 |
| 2021 | 18 | 17 |
| 2022 | 18 | 23 |
| 2023 | 18 | 14 |
| 2024 | 6 | 12 |
| 2025 | 6 | 11 |
| 2026 | 9 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Processes and systems for upgrading a hydrocarbon25 Aug 2026US 12,716,038 B2ExxonMobil Chemical Patents Inc.
- Multi-stage direct capture of CO2 from air11 Aug 2026US 12,702,947 B2ExxonMobil Technology and Engineering Company
- System and method for purifying hydrogen, and system for producing hydrogen by water electrolysis11 Aug 2026US 12,702,949 B2Wuxi Longi Hydrogen Technology Co., Ltd.
- Oxygen-enriched combustion for natural gas combined cycle operation4 Aug 2026US 12,697,580 B2ExxonMobil Technology and Engineering Company
- Pressure swing adsorption apparatus for high purity hydrogen purification from ammonia decomposition and hydrogen purification method using the same4 Aug 2026US 12,697,581 B2Korea Institute of Energy Research
- Adsorption dryer24 Sep 2026US 2026/0284575 A1
- Method and apparatus for drying a flow rich in carbon dioxide17 Sep 2026US 2026/0273459 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Multimodal oxygen control module and multimodal oxygen control apparatus6 Aug 2026US 2026/0225027 A1Samsung Electronics Co., Ltd.
- Blast furnace gas pressure swing adsorption carbon dioxide capture system coupled with compressed energy storage9 Jul 2026US 2026/0192238 A1Hebei Chuangjie Environmental Protection Engineering Co., Ltd.
- Systems and methods of renewable natural gas processing9 Jul 2026US 2026/0192242 A1
Most cited
By later US patents
- Portable oxygen concentration system and method of using the same223US 6,691,702 B2SeQual Technologies, Inc. · 2004
- High frequency pressure swing adsorption186US 6,176,897 B1Questor Industries Inc. · 2001
- Carbon dioxide pressure swing adsorption process using modified alumina adsorbents155US 5,917,136 AAir Products and Chemicals, Inc. · 1999
- Selective adsorption process139US 3,986,849 AUnion Carbide Corporation · 1976
- Gas concentration sensor and control for oxygen concentrator utilizing gas concentration sensor139US 5,917,135 AInvacare Corporation · 1999