F25J 3/04
For air
Official title: for air
F25J3/04 (For air) appears on 1,714 US grants and 1,240 published applications in this corpus.
Search patents in F25J- Granted patents
- 1,714
- Published applications
- 1,240
- Assignees
- 339
- Inventors
- 1,908
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 9 | 0 |
| 1978 | 8 | 0 |
| 1979 | 6 | 0 |
| 1980 | 10 | 0 |
| 1981 | 10 | 0 |
| 1982 | 7 | 0 |
| 1983 | 15 | 0 |
| 1984 | 16 | 0 |
| 1985 | 13 | 0 |
| 1986 | 16 | 0 |
| 1987 | 26 | 0 |
| 1988 | 30 | 0 |
| 1989 | 32 | 0 |
| 1990 | 20 | 0 |
| 1991 | 28 | 0 |
| 1992 | 51 | 0 |
| 1993 | 48 | 0 |
| 1994 | 52 | 0 |
| 1995 | 67 | 0 |
| 1996 | 49 | 0 |
| 1997 | 72 | 0 |
| 1998 | 63 | 0 |
| 1999 | 84 | 0 |
| 2000 | 66 | 0 |
| 2001 | 98 | 17 |
| 2002 | 53 | 42 |
| 2003 | 61 | 36 |
| 2004 | 29 | 49 |
| 2005 | 25 | 24 |
| 2006 | 20 | 54 |
| 2007 | 27 | 40 |
| 2008 | 18 | 47 |
| 2009 | 25 | 46 |
| 2010 | 11 | 48 |
| 2011 | 19 | 52 |
| 2012 | 14 | 46 |
| 2013 | 23 | 62 |
| 2014 | 19 | 57 |
| 2015 | 36 | 48 |
| 2016 | 36 | 56 |
| 2017 | 42 | 65 |
| 2018 | 46 | 55 |
| 2019 | 51 | 62 |
| 2020 | 47 | 56 |
| 2021 | 38 | 51 |
| 2022 | 37 | 55 |
| 2023 | 32 | 56 |
| 2024 | 37 | 52 |
| 2025 | 38 | 35 |
| 2026 | 26 | 29 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F25J 3/04248Generation of cold for compensating heat leaks or liquid production920
- F25J 3/04763Start-up or control of the process862
- F25J 3/04406Using a dual pressure main column system848
- F25J 3/04006Providing pressurised feed air or process streams within or from the air744
- F25J 3/04151Purification and cooling of the feed air690
- F25J 3/04642Recovering noble gases from air445
- F25J 3/04521Coupling of the air fractionation unit to an air gas-consuming unit, so-called389
- F25J 3/044Using a single pressure main column system only178
All 13 subgroupsShow fewer
- F25J 3/04436Using at least a triple pressure main column system118
- F25J 3/04472Using the cold from cryogenic liquids produced within the air fractionation unit85
- F25J 3/04636Using a hybrid air separation unit61
- F25J 3/0446Using the heat generated by mixing two different phases41
- F25J 3/04624Using integrated mass and heat exchange, so-called non-adiabatic rectification35
Recent patents
- Method for configuring a control system for a process plant29 Sep 2026US 12,747,912 B2Linde Aktiengesellschaft
- Liquefied hydrogen production device22 Sep 2026US 12,742,590 B2Jgc Corporation
- 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 method for cryogenic separation of air using a distillation column system including an intermediate pressure kettle column15 Sep 2026US 12,736,282 B2Praxair Technology, Inc.
- 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
- Process and apparatus for air separation by cryogenic distillation1 Oct 2026US 2026/0298532 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Adsorption-membrane-distillation direct air capture systems and methods24 Sep 2026US 2026/0284587 A1Georgia Tech Research Corporation
- Method for cryogenic separation of air, and air separation plant10 Sep 2026US 2026/0266538 A1
- Method for cryogenic separation of air, and air separation system10 Sep 2026US 2026/0266539 A1Linde Aktiengesellschaft
- Cold box and method of assembly27 Aug 2026US 2026/0251388 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
Most cited
By later US patents
- Hydrocarbon combustion power generation system with CO2 sequestration337US 6,389,814 B1Clean Energy Systems, Inc. · 2002
- Method for producing methane-containing gaseous mixtures305US 5,388,645 AAmoco Corporation · 1995
- Power plant with carbon dioxide capture and zero pollutant emissions254US 5,724,805 AUniversity of Massachusetts Lowell · 1998
- Method for recovering methane from a solid carbonaceous subterranean formation224US 5,566,755 AAmoco Corporation · 1996
- Hydrocarbon combustion power generation system with CO2 sequestration216US 7,043,920 B2Clean Energy Systems, Inc. · 2006