F25J 2270/00
Refrigeration techniques used
F25J2270/00 (Refrigeration techniques used) appears on 1,604 US grants and 1,729 published applications in this corpus.
Search patents in F25J- Granted patents
- 1,604
- Published applications
- 1,729
- Assignees
- 551
- Inventors
- 2,606
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 14 | 0 |
| 1978 | 12 | 0 |
| 1979 | 14 | 0 |
| 1980 | 15 | 0 |
| 1981 | 16 | 0 |
| 1982 | 18 | 0 |
| 1983 | 11 | 0 |
| 1984 | 24 | 0 |
| 1985 | 23 | 0 |
| 1986 | 29 | 0 |
| 1987 | 38 | 0 |
| 1988 | 33 | 0 |
| 1989 | 17 | 0 |
| 1990 | 28 | 0 |
| 1991 | 11 | 0 |
| 1992 | 9 | 0 |
| 1993 | 20 | 0 |
| 1994 | 22 | 0 |
| 1995 | 27 | 0 |
| 1996 | 22 | 0 |
| 1997 | 29 | 0 |
| 1998 | 17 | 0 |
| 1999 | 33 | 0 |
| 2000 | 31 | 0 |
| 2001 | 46 | 5 |
| 2002 | 32 | 25 |
| 2003 | 26 | 22 |
| 2004 | 26 | 36 |
| 2005 | 18 | 36 |
| 2006 | 23 | 49 |
| 2007 | 33 | 34 |
| 2008 | 19 | 51 |
| 2009 | 28 | 53 |
| 2010 | 12 | 96 |
| 2011 | 18 | 73 |
| 2012 | 26 | 72 |
| 2013 | 34 | 76 |
| 2014 | 33 | 63 |
| 2015 | 32 | 74 |
| 2016 | 47 | 69 |
| 2017 | 69 | 113 |
| 2018 | 65 | 108 |
| 2019 | 86 | 100 |
| 2020 | 81 | 80 |
| 2021 | 58 | 88 |
| 2022 | 56 | 78 |
| 2023 | 59 | 92 |
| 2024 | 61 | 104 |
| 2025 | 50 | 65 |
| 2026 | 46 | 67 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F25J 2270/90External refrigerationIndexing code706
- F25J 2270/12External refrigeration with liquid vaporising loopIndexing code443
- F25J 2270/02Internal refrigeration with liquid vaporising loopIndexing code408
- F25J 2270/04Internal refrigeration with work-producing gas expansion loopIndexing code383
- F25J 2270/60Closed external refrigeration cycle with single component refrigerant [scr]Indexing code322
- F25J 2270/14External refrigeration with work-producing gas expansion loopIndexing code195
- F25J 2270/66Closed external refrigeration cycle with multi component refrigerant [mcr]Indexing code186
- F25J 2270/42Quasi-closed internal or closed external nitrogen refrigeration cycleIndexing code97
All 18 subgroupsShow fewer
- F25J 2270/88Quasi-closed internal refrigeration or heat pump cycle, if not otherwise providedIndexing code91
- F25J 2270/18External refrigeration with incorporated cascade loopIndexing code73
- F25J 2270/08Internal refrigeration by flash gas recovery loopIndexing code59
- F25J 2270/24Quasi-closed internal or closed external carbon monoxide refrigeration cycleIndexing code33
- F25J 2270/80Quasi-closed internal or closed external carbon dioxide refrigeration cycleIndexing code33
- F25J 2270/50Quasi-closed internal or closed external oxygen refrigeration cycleIndexing code16
- F25J 2270/40Quasi-closed internal or closed external air refrigeration cycleIndexing code15
- F25J 2270/58Quasi-closed internal or closed external argon refrigeration cycleIndexing code15
- F25J 2270/20Quasi-closed internal or closed external hydrogen refrigeration cycleIndexing code7
- F25J 2270/30Quasi-closed internal or closed external helium refrigeration cycleIndexing code7
Recent patents
- Hydrogen liquefaction system and hydrogen liquefaction method29 Sep 2026US 12,747,911 B2H2CREO Corp.
- 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
- System and method for co-production of a densified liquid oxygen product and densified liquid methane product15 Sep 2026US 12,736,280 B2Praxair Technology, Inc.
- Method for generating refrigeration for a carbon monoxide cold box15 Sep 2026US 12,736,281 B2Praxair Technology, Inc.
- Apparatus and process for improved argon recovery8 Sep 2026US 12,729,908 B2Air Products and Chemicals, Inc.
- 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
- Cryogenic process for helium recovery from low helium-containing gas stream24 Sep 2026US 2026/0287252 A1Council of Scientific and Industrial Research
- Gas liquefaction system17 Sep 2026US 2026/0276300 A1Kawasaki Jukogyo Kabushiki Kaisha
- Method for cryogenic separation of air, and air separation system10 Sep 2026US 2026/0266539 A1Linde Aktiengesellschaft
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
- Hydrocarbon gas processing136US 4,140,504 AThe Ortloff Corporation · 1979