F25J 2270/42
Quasi-closed internal or closed external nitrogen refrigeration cycle
F25J2270/42 (Quasi-closed internal or closed external nitrogen refrigeration cycle) appears on 97 US grants and 124 published applications in this corpus.
Search patents in F25J- Granted patents
- 97
- Published applications
- 124
- Assignees
- 56
- Inventors
- 285
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 7 | 0 |
| 2002 | 1 | 3 |
| 2003 | 4 | 3 |
| 2004 | 2 | 5 |
| 2005 | 3 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 1 | 2 |
| 2009 | 0 | 3 |
| 2010 | 0 | 3 |
| 2011 | 1 | 5 |
| 2012 | 1 | 3 |
| 2013 | 1 | 4 |
| 2014 | 0 | 4 |
| 2015 | 1 | 1 |
| 2016 | 4 | 4 |
| 2017 | 2 | 14 |
| 2018 | 6 | 10 |
| 2019 | 5 | 5 |
| 2020 | 3 | 1 |
| 2021 | 5 | 7 |
| 2022 | 2 | 13 |
| 2023 | 3 | 4 |
| 2024 | 4 | 17 |
| 2025 | 4 | 7 |
| 2026 | 6 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Dual temperature liquid oxygen subcooling in an air separation unit22 Sep 2026US 12,742,591 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Air separation unit and air separation method25 Aug 2026US 12,716,651 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Device and method for recovering gas with variable low-temperature23 Jun 2026US 12,663,210 B2Hangzhou Oxygen Plant Group Co., Ltd.
- Device and method for recovering carbon dioxide and nitrogen from flue gas14 Apr 2026US 12,601,540 B2Hangzhou Oxygen Plant Group Co., Ltd.
- System, method and apparatus for the regeneration of nitrogen energy within a closed loop cryogenic system7 Apr 2026US 12,595,938 B2
- Low-temperature distillation method for capturing carbon dioxide11 Jun 2026US 2026/0160489 A1Shihezi University
- Method of Hydrogen Liquefaction Using Optimized Claude Refrigeration Cycles2 Apr 2026US 2026/0092734 A1Evergreen Cryogenics Inc.
- High-purity oxygen production apparatus5 Mar 2026US 2026/0063360 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.
- Containerized Gas Processing System with Evacuated Processing Compartment19 Feb 2026US 2026/0049763 A1
Most cited
By later US patents
- Combined power cycle with liquefied natural gas (LNG) and synthesis or fuel gas140US 5,295,350 ATexaco Inc. · 1994
- Combined power cycle with liquefied natural gas (LNG) and synthesis or fuel gas75US 5,394,686 ATexaco Inc. · 1995
- Argon recovery from argon-oxygen-decarburization process waste gases71US 5,125,934 AThe BOC Group, Inc. · 1992
- Process to separate nitrogen from natural gas53US 4,415,345 AUnion Carbide Corporation · 1983
- Separation of hydrogen-hydrocarbon gas mixtures using closed-loop gas expander refrigeration36US 6,560,989 B1Air Products and Chemicals, Inc. · 2003