F25J 2215/42
Nitrogen or special cases
Official title: Nitrogen or special cases, e.g. multiple or low purity N2
F25J2215/42 (Nitrogen or special cases) appears on 168 US grants and 115 published applications in this corpus.
Search patents in F25J- Granted patents
- 168
- Published applications
- 115
- Assignees
- 52
- Inventors
- 302
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 4 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 8 | 0 |
| 1993 | 6 | 0 |
| 1994 | 12 | 0 |
| 1995 | 8 | 0 |
| 1996 | 7 | 0 |
| 1997 | 11 | 0 |
| 1998 | 6 | 0 |
| 1999 | 8 | 0 |
| 2000 | 5 | 0 |
| 2001 | 3 | 2 |
| 2002 | 8 | 1 |
| 2003 | 5 | 2 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 0 | 2 |
| 2008 | 0 | 3 |
| 2009 | 2 | 3 |
| 2010 | 1 | 3 |
| 2011 | 2 | 4 |
| 2012 | 0 | 0 |
| 2013 | 2 | 1 |
| 2014 | 2 | 2 |
| 2015 | 3 | 2 |
| 2016 | 1 | 1 |
| 2017 | 2 | 16 |
| 2018 | 4 | 10 |
| 2019 | 9 | 10 |
| 2020 | 7 | 5 |
| 2021 | 5 | 8 |
| 2022 | 2 | 6 |
| 2023 | 3 | 8 |
| 2024 | 8 | 9 |
| 2025 | 2 | 10 |
| 2026 | 7 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method and apparatus for cryogenic air separation8 Sep 2026US 12,729,907 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Apparatus and process for improved argon recovery8 Sep 2026US 12,729,908 B2Air Products and Chemicals, Inc.
- System for storing and producing energy to stabilize the power network26 May 2026US 12,638,234 B2Saipem S.P.A.
- Oxygen liquefier design phasing26 May 2026US 12,638,235 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Device and method for recovering carbon dioxide and nitrogen from flue gas14 Apr 2026US 12,601,540 B2Hangzhou Oxygen Plant Group Co., Ltd.
- Method for cryogenic separation of air, and air separation plant10 Sep 2026US 2026/0266538 A1
- Process and apparatus for intermittent liquefaction operation that can support continuous air separation processing6 Aug 2026US 2026/0227123 A1Air Products and Chemicals, Inc.
- Method for increasing production flexibility of an air separation unit28 May 2026US 2026/0146790 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- System and method for simultaneously producing high-purity liquid nitrogen and high-purity liquid carbon dioxide at low cost by using flue gas26 Feb 2026US 2026/0055956 A1Hangzhou Oxygen Plant Group Co., Ltd.
- System and method for production of ultra-high purity oxygen5 Feb 2026US 2026/0035243 A1
Most cited
By later US patents
- Apparatus for low temperature purification of gases78US 5,202,096 AThe BOC Group, Inc. · 1993
- Air purification process72US 5,914,455 AThe BOC Group, Inc. · 1999
- Gas separation process63US 4,417,909 AAirco, Inc. · 1983
- Process for the generation of gaseous and/or liquid nitrogen49US 4,595,405 AAir Products and Chemicals, Inc. · 1986
- Chemical process optimization method46US 5,315,521 APraxair Technology, Inc. · 1994