F25J 3/04448
In a double column flowsheet with an intermediate pressure column
Official title: {in a double column flowsheet with an intermediate pressure column}
F25J3/04448 (In a double column flowsheet with an intermediate pressure column) appears on 73 US grants and 48 published applications in this corpus.
Search patents in F25J- Granted patents
- 73
- Published applications
- 48
- Assignees
- 18
- Inventors
- 70
- Latest grant
- 8 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 8 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 7 | 1 |
| 2002 | 2 | 4 |
| 2003 | 5 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 0 | 2 |
| 2009 | 2 | 2 |
| 2010 | 1 | 1 |
| 2011 | 1 | 2 |
| 2012 | 0 | 1 |
| 2013 | 1 | 4 |
| 2014 | 0 | 4 |
| 2015 | 2 | 1 |
| 2016 | 1 | 5 |
| 2017 | 1 | 2 |
| 2018 | 3 | 2 |
| 2019 | 6 | 1 |
| 2020 | 2 | 1 |
| 2021 | 0 | 2 |
| 2022 | 0 | 3 |
| 2023 | 1 | 0 |
| 2024 | 4 | 5 |
| 2025 | 2 | 2 |
By publication year. Applications have been published since 2001.
Recent patents
- Air separation unit and method for cryogenic separation of air using a distillation column system including an intermediate pressure kettle column8 Jul 2025US 12,352,496 B2Praxair Technology, Inc.
- System and method for cryogenic air separation using four distillation columns including an intermediate pressure column28 Jan 2025US 12,209,802 B2Praxair Technology, Inc.
- Air separation device and air separation method22 Oct 2024US 12,123,647 B2Taiyo Nippon Sanso Corporation
- Air separation unit and method for production of nitrogen and argon using a distillation column system with an intermediate pressure kettle column6 Aug 2024US 12,055,345 B2Praxair Technology, Inc.
- Method and apparatus for producing high-purity nitrogen and low-purity oxygen21 May 2024US 11,988,446 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Apparatus and process for providing nitrogen and oxygen18 Sep 2025US 2025/0290692 A1Air Products and Chemicals, Inc.
- Effective use of cryogenic separation section in syngas manufacture23 Jan 2025US 2025/0026639 A1Topsoe A/S
- Air separation unit and method for cryogenic separation of air using a distillation column system including an intermediate pressure kettle column1 Feb 2024US 2024/0035740 A1Praxair Technology, Inc.
- Air separation unit and method for cryogenic separation of air using a distillation column system including an intermediate pressure kettle column1 Feb 2024US 2024/0035741 A1Praxair Technology, Inc.
- Air separation unit and method for production of high purity nitrogen product using a distillation column system with an intermediate pressure kettle column1 Feb 2024US 2024/0035742 A1Praxair Technology, Inc.
Most cited
By later US patents
- Air separation with medium pressure enrichment30US 4,433,989 A1984
- Cryogenic distillation process for the production of oxygen and nitrogen26US 5,231,837 ALiquid Air Engineering Corporation · 1993
- Triple distillation column nitrogen generator with plural reboiler/condensers25US 5,069,699 AAir Products and Chemicals, Inc. · 1991
- Cryogenic rectification system with kettle liquid column22US 5,675,977 APraxair Technology, Inc. · 1997
- Cryogenic system for producing low-purity oxygen20US 4,254,629 AUnion Carbide Corporation · 1981