F25J 3/04969
Retrofitting or revamping of an existing air fractionation unit
Official title: {Retrofitting or revamping of an existing air fractionation unit}
F25J3/04969 (Retrofitting or revamping of an existing air fractionation unit) appears on 64 US grants and 50 published applications in this corpus.
Search patents in F25J- Granted patents
- 64
- Published applications
- 50
- Assignees
- 20
- Inventors
- 110
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 1 |
| 2002 | 4 | 1 |
| 2003 | 1 | 0 |
| 2004 | 4 | 5 |
| 2005 | 1 | 1 |
| 2006 | 0 | 1 |
| 2007 | 2 | 4 |
| 2008 | 0 | 2 |
| 2009 | 2 | 2 |
| 2010 | 2 | 4 |
| 2011 | 1 | 2 |
| 2012 | 0 | 1 |
| 2013 | 3 | 1 |
| 2014 | 1 | 0 |
| 2015 | 0 | 1 |
| 2016 | 0 | 0 |
| 2017 | 0 | 7 |
| 2018 | 6 | 3 |
| 2019 | 2 | 3 |
| 2020 | 1 | 3 |
| 2021 | 3 | 2 |
| 2022 | 3 | 4 |
| 2023 | 1 | 0 |
| 2024 | 1 | 1 |
| 2025 | 2 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Apparatus and process for improved argon recovery8 Sep 2026US 12,729,908 B2Air Products and Chemicals, Inc.
- Apparatus and process for liquefying gases9 Dec 2025US 12,492,864 B1
- Process and apparatus for improved recovery of argon12 Aug 2025US 12,385,692 B2Air Products and Chemicals, Inc.
- Fluid recovery process and apparatus for xenon and or krypton recovery1 Oct 2024US 12,104,850 B2Air Products and Chemicals, Inc.
- Method and apparatus for separating air by cryogenic distillation26 Dec 2023US 11,852,408 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Apparatus and Process for Improved Argon Recovery9 Oct 2025US 2025/0314424 A1Air Products and Chemicals, Inc.
- Process and Apparatus for Improved Recovery of Argon18 Apr 2024US 2024/0125550 A1Air Products and Chemicals, Inc.
- Fluid recovery process and apparatus for xenon and or krypton recovery10 Nov 2022US 2022/0357104 A1Air Products and Chemicals, Inc.
- Method for flexible recovery of argon from a cryogenic air separation unit12 May 2022US 2022/0146195 A1
- System and method for flexible recovery of argon from a cryogenic air separation unit12 May 2022US 2022/0146196 A1
Most cited
By later US patents
- Use of nitrogen from an air separation unit as gas turbine air compressor feed refrigerant to improve power output141US 5,388,395 AAir Products and Chemicals, Inc. · 1995
- Integrated apparatus for generating power and/or oxygen enriched fluid and process for the operation thereof91US 6,202,442 B1L'Air Liquide Societe Anonyme Pour l'Etude et l'Expoitation des Procedes Georges Claude · 2001
- Integrated apparatus for generating power and/or oxygen enriched fluid, process for the operation thereof82US 6,276,171 B1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude · 2001
- Process for removing oxygen from crude argon50US 5,035,726 AAir Products and Chemicals, Inc. · 1991
- Device for compressing a gaseous medium and systems comprising such device42US 6,453,659 B1N. V. Kema · 2002