F25J 3/02
Processes or apparatus for separating the constituents of gaseous or liquefied gaseous
Official title: by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream (F25J3/08 takes precedence {; purification of hydrocarbons in general C07C7/00})
F25J3/02 (Processes or apparatus for separating the constituents of gaseous or liquefied gaseous) appears on 3,093 US grants and 2,597 published applications in this corpus.
Search patents in F25J- Granted patents
- 3,093
- Published applications
- 2,597
- Assignees
- 652
- Inventors
- 3,679
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 16 | 0 |
| 1977 | 21 | 0 |
| 1978 | 21 | 0 |
| 1979 | 20 | 0 |
| 1980 | 23 | 0 |
| 1981 | 30 | 0 |
| 1982 | 25 | 0 |
| 1983 | 25 | 0 |
| 1984 | 42 | 0 |
| 1985 | 41 | 0 |
| 1986 | 38 | 0 |
| 1987 | 61 | 0 |
| 1988 | 61 | 0 |
| 1989 | 44 | 0 |
| 1990 | 38 | 0 |
| 1991 | 39 | 0 |
| 1992 | 62 | 0 |
| 1993 | 54 | 0 |
| 1994 | 69 | 0 |
| 1995 | 82 | 0 |
| 1996 | 69 | 0 |
| 1997 | 97 | 0 |
| 1998 | 85 | 0 |
| 1999 | 109 | 0 |
| 2000 | 90 | 0 |
| 2001 | 130 | 22 |
| 2002 | 74 | 67 |
| 2003 | 88 | 57 |
| 2004 | 45 | 77 |
| 2005 | 41 | 60 |
| 2006 | 41 | 92 |
| 2007 | 54 | 69 |
| 2008 | 38 | 99 |
| 2009 | 46 | 97 |
| 2010 | 26 | 121 |
| 2011 | 35 | 107 |
| 2012 | 42 | 118 |
| 2013 | 58 | 115 |
| 2014 | 53 | 104 |
| 2015 | 73 | 125 |
| 2016 | 76 | 117 |
| 2017 | 97 | 142 |
| 2018 | 110 | 128 |
| 2019 | 122 | 134 |
| 2020 | 103 | 130 |
| 2021 | 94 | 125 |
| 2022 | 83 | 122 |
| 2023 | 81 | 114 |
| 2024 | 82 | 105 |
| 2025 | 81 | 78 |
| 2026 | 58 | 72 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
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
- Method for generating refrigeration for a carbon monoxide cold box15 Sep 2026US 12,736,281 B2Praxair Technology, Inc.
- 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.
- Process for starting up a carbon capture process1 Oct 2026US 2026/0295494 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Method for liquefying carbon dioxide1 Oct 2026US 2026/0298531 A1
- 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
- Cryogenic process for helium recovery from low helium-containing gas stream24 Sep 2026US 2026/0287252 A1Council of Scientific and Industrial Research
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