F25J 2270/40
Quasi-closed internal or closed external air refrigeration cycle
F25J2270/40 (Quasi-closed internal or closed external air refrigeration cycle) appears on 15 US grants and 10 published applications in this corpus.
Search patents in F25J- Granted patents
- 15
- Published applications
- 10
- Assignees
- 8
- Inventors
- 40
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 2 | 2 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 1 | 1 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 1 | 2 |
| 2017 | 0 | 1 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 0 | 0 |
| 2025 | 0 | 2 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Oxygen liquefier design phasing26 May 2026US 12,638,235 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Method and system for providing supplemental refrigeration to an air separation plant10 Jul 2018US 10,018,412 B2Praxair Technology, Inc.
- Method and system for air separation using a supplemental refrigeration cycle22 Mar 2016US 9,291,388 B2Praxair Technology, Inc.
- Method and apparatus for pressurized product production19 Mar 2013US 8,397,535 B2Praxair Technology, Inc.
- Process and apparatus for the recovery of krypton and/or xenon1 Feb 2005US 6,848,269 B2Air Products and Chemicals, Inc.
- Liquid nitrogen generator and process30 Oct 2025US 2025/0334332 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Carbon capture using cryogenic techniques21 Aug 2025US 2025/0262565 A1Technip Energies France
- Oxygen liquefier design phasing16 Mar 2023US 2023/0082208 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Method and system for providing supplemental refrigeration to an air separation plant11 May 2017US 2017/0131029 A1Praxair Technology, Inc.
- System and method for integrated air separation and liquefaction25 Aug 2016US 2016/0245585 A1
Most cited
By later US patents
- Separation of hydrogen-hydrocarbon gas mixtures using closed-loop gas expander refrigeration36US 6,560,989 B1Air Products and Chemicals, Inc. · 2003
- Process and apparatus for the recovery of krypton and/or xenon36US 6,694,775 B1Air Products and Chemicals, Inc. · 2004
- Separation of H.sub.2, CO, and CH.sub.4 synthesis gas with methane wash31US 4,102,659 AUnion Carbide Corporation · 1978
- Nitrogen production method24US 4,617,037 ANippon Sanso Corporation · 1986
- Argon and nitrogen coproduction process17US 4,861,361 AThe BOC Group, Inc. · 1989