F25J 2270/90
External refrigeration
Official title: External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
F25J2270/90 (External refrigeration) appears on 706 US grants and 721 published applications in this corpus.
Search patents in F25J- Granted patents
- 706
- Published applications
- 721
- Assignees
- 370
- Inventors
- 1,496
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 6 | 0 |
| 1978 | 5 | 0 |
| 1979 | 5 | 0 |
| 1980 | 7 | 0 |
| 1981 | 8 | 0 |
| 1982 | 9 | 0 |
| 1983 | 4 | 0 |
| 1984 | 5 | 0 |
| 1985 | 10 | 0 |
| 1986 | 12 | 0 |
| 1987 | 22 | 0 |
| 1988 | 13 | 0 |
| 1989 | 7 | 0 |
| 1990 | 17 | 0 |
| 1991 | 4 | 0 |
| 1992 | 3 | 0 |
| 1993 | 7 | 0 |
| 1994 | 7 | 0 |
| 1995 | 18 | 0 |
| 1996 | 11 | 0 |
| 1997 | 10 | 0 |
| 1998 | 9 | 0 |
| 1999 | 17 | 0 |
| 2000 | 13 | 0 |
| 2001 | 26 | 3 |
| 2002 | 17 | 16 |
| 2003 | 16 | 16 |
| 2004 | 12 | 18 |
| 2005 | 8 | 11 |
| 2006 | 11 | 29 |
| 2007 | 18 | 11 |
| 2008 | 12 | 21 |
| 2009 | 11 | 20 |
| 2010 | 2 | 37 |
| 2011 | 8 | 23 |
| 2012 | 6 | 27 |
| 2013 | 14 | 32 |
| 2014 | 11 | 31 |
| 2015 | 10 | 27 |
| 2016 | 14 | 27 |
| 2017 | 27 | 54 |
| 2018 | 31 | 48 |
| 2019 | 45 | 49 |
| 2020 | 30 | 36 |
| 2021 | 26 | 30 |
| 2022 | 30 | 30 |
| 2023 | 25 | 37 |
| 2024 | 28 | 32 |
| 2025 | 22 | 29 |
| 2026 | 14 | 27 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F25J 2270/904By liquid or gaseous cryogen in an open loopIndexing code181
- F25J 2270/902Details about the refrigeration cycle usedIndexing code90
- F25J 2270/908By regenerative chillers, i.e. oscillating or dynamic systemsIndexing code79
- F25J 2270/912Liquefaction cycle of a low-boiling gas in a cryocooler, i.e. in aIndexing code56
- F25J 2270/906By heat driven absorption chillersIndexing code49
Recent patents
- Method for generating refrigeration for a carbon monoxide cold box15 Sep 2026US 12,736,281 B2Praxair Technology, Inc.
- System and method for removing natural gas liquids from rich gas1 Sep 2026US 12,723,806 B2
- Method and system for separating a gas mixture25 Aug 2026US 12,714,965 B2Linde Aktiengesellschaft
- Apparatus and process for removal of heavy hydrocarbons from a feed gas11 Aug 2026US 12,703,831 B2Honeywell Lng LLC
- Process and apparatus for liquefaction of CO211 Aug 2026US 12,704,322 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Method for liquefying carbon dioxide1 Oct 2026US 2026/0298531 A1
- A method of and apparatus for reliquefying of boil-off gas stream obtained from liquefied gas in a gas storage of a floating storage unit24 Sep 2026US 2026/0287251 A1WäRtsilä Gas Solutions Norway AS
- Gas liquefaction system17 Sep 2026US 2026/0276300 A1Kawasaki Jukogyo Kabushiki Kaisha
- Cryogenic cooling system3 Sep 2026US 2026/0257609 A1
- Method and plant for separation of carbon dioxide (co2)27 Aug 2026US 2026/0251390 A1Aker Carbon Capture Norway AS
Most cited
By later US patents
- Low pressure process for C.sub.3.sup.+ liquids recovery from process product gas213US 4,734,115 AAir Products and Chemicals, Inc. · 1988
- Carbon dioxide recovery156US 4,762,543 AAmoco Corporation · 1988
- LNG production using dual independent expander refrigeration cycles149US 6,412,302 B1ABB Lummus Global, Inc. - Randall Division · 2002
- Combined power cycle with liquefied natural gas (LNG) and synthesis or fuel gas140US 5,295,350 ATexaco Inc. · 1994
- Methods and apparatus to generate liquid ambulatory oxygen from an oxygen concentrator136US 5,979,440 ASeQual Technologies, Inc. · 1999