F25J 3/0257
Separation of nitrogen
Official title: {separation of nitrogen (from air F25J3/04, production of nitrogen in general C01B21/00)}
F25J3/0257 (Separation of nitrogen) appears on 311 US grants and 310 published applications in this corpus.
Search patents in F25J- Granted patents
- 311
- Published applications
- 310
- Assignees
- 108
- Inventors
- 553
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 5 | 0 |
| 1981 | 3 | 0 |
| 1982 | 7 | 0 |
| 1983 | 2 | 0 |
| 1984 | 8 | 0 |
| 1985 | 6 | 0 |
| 1986 | 5 | 0 |
| 1987 | 7 | 0 |
| 1988 | 10 | 0 |
| 1989 | 4 | 0 |
| 1990 | 5 | 0 |
| 1991 | 5 | 0 |
| 1992 | 4 | 0 |
| 1993 | 3 | 0 |
| 1994 | 5 | 0 |
| 1995 | 3 | 0 |
| 1996 | 6 | 0 |
| 1997 | 9 | 0 |
| 1998 | 5 | 0 |
| 1999 | 7 | 0 |
| 2000 | 8 | 0 |
| 2001 | 9 | 0 |
| 2002 | 3 | 5 |
| 2003 | 5 | 7 |
| 2004 | 7 | 8 |
| 2005 | 3 | 4 |
| 2006 | 2 | 5 |
| 2007 | 3 | 4 |
| 2008 | 6 | 15 |
| 2009 | 3 | 6 |
| 2010 | 2 | 17 |
| 2011 | 4 | 12 |
| 2012 | 4 | 20 |
| 2013 | 7 | 4 |
| 2014 | 7 | 11 |
| 2015 | 6 | 16 |
| 2016 | 12 | 12 |
| 2017 | 7 | 32 |
| 2018 | 14 | 23 |
| 2019 | 18 | 12 |
| 2020 | 11 | 12 |
| 2021 | 16 | 26 |
| 2022 | 8 | 9 |
| 2023 | 11 | 14 |
| 2024 | 9 | 10 |
| 2025 | 5 | 15 |
| 2026 | 6 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System and method for separating methane and nitrogen with reduced horsepower demands19 May 2026US 12,631,393 B2BCCK Holding Company
- Device and method for recovering carbon dioxide and nitrogen from flue gas14 Apr 2026US 12,601,540 B2Hangzhou Oxygen Plant Group Co., Ltd.
- Method and apparatus for separating carbon dioxide from a residual gas in a fluidised bed catalytic cracking plant (FCC)17 Feb 2026US 12,551,840 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Integration of ammonia fuel for SMR for hydrogen production17 Feb 2026US 12,552,667 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Method for separating hydrogen and nitrogen from cracked ammonia17 Feb 2026US 12,552,668 B2L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Claude Georges
- Single Column Nitrogen Rejection Unit20 Aug 2026US 2026/0243507 A1Chart Energy & Chemicals, Inc.
- Process and apparatus for purifying air and cryogenic air separation process and plant20 Aug 2026US 2026/0243508 A1
- Method for separating nitrogen from lng13 Aug 2026US 2026/0235353 A1Linde Aktiengesellschaft
- Nitrogen management in an lng plant6 Aug 2026US 2026/0227121 A1ConocoPhillips Company
- Nitrogen Rejection Unit with Mixed Refrigerant Cooling System and Method28 May 2026US 2026/0146785 A1
Most cited
By later US patents
- Integrated process for converting hydrocarbon gas to liquids124US 6,248,794 B1Atlantic Richfield Company · 2001
- Method for the recovery of low purity carbon dioxide104US 4,977,745 A1990
- Absorption process without external solvent97US 5,462,583 AAdvanced Extraction Technologies, Inc. · 1995
- Membrane-augmented power generation94US 6,035,641 AMembane Technology and Research, Inc. · 2000
- Integrated processing of natural gas into liquid products87US 6,743,829 B2BP Corporation North America Inc. · 2004