F25J 3/04242
Cold end purification of the feed air
Official title: {Cold end purification of the feed air}
F25J3/04242 (Cold end purification of the feed air) appears on 20 US grants and 9 published applications in this corpus.
Search patents in F25J- Granted patents
- 20
- Published applications
- 9
- Assignees
- 12
- Inventors
- 50
- Latest grant
- 11 Mar 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 2 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 2 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 1 |
| 2023 | 0 | 1 |
| 2024 | 2 | 0 |
| 2025 | 1 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Pre-purification arrangement for air separation and method of hybrid air purification11 Mar 2025US 12,247,782 B2Air Products and Chemicals, Inc.
- Chiller, air separation system, and related methods16 Jul 2024US 12,038,230 B2Air Products and Chemicals, Inc.
- System and method for recovery of nitrogen, argon, and oxygen in moderate pressure cryogenic air separation unit19 Mar 2024US 11,933,538 B2Praxair Technology, Inc.
- Energy efficient, inexpensive extraction of oxygen from ambient air for portable and home use1 May 2007US 7,210,312 B2SunPower Corporation
- Nitrogen generation process28 Oct 2003US 6,637,240 B1Air Products and Chemicals, Inc.
- Process and apparatus for purifying air and cryogenic air separation process and plant20 Aug 2026US 2026/0243508 A1
- Process and plant for providing a nitrogen product, an oxygen product and a hydrogen product28 Aug 2025US 2025/0271208 A1Linde Aktiengesellschaft
- Pre-purification arrangement for air separation and method of hybrid air purification23 Mar 2023US 2023/0087673 A1Air Products and Chemicals, Inc.
- Chiller, air separation system, and related methods31 Mar 2022US 2022/0099367 A1Air Products and Chemicals, Inc.
- System and method for recovery of nitrogen, argon, and oxygen in moderate pressure cryogenic air separation unit11 Nov 2021US 2021/0348842 A1Praxair Technology, Inc.
Most cited
By later US patents
- Nitrogen generator cycle30US 4,400,188 AAir Products and Chemicals, Inc. · 1983
- Purification of oxygen by cryogenic adsorption22US 5,425,240 AThe BOC Group, Inc. · 1995
- Process for the production of high pressure oxygen gas21US 4,345,925 AUnion Carbide Corporation · 1982
- Air separating system16US 4,367,082 AKabushiki Kaisha Kobe Seiko Sho · 1983
- Dual column high pressure nitrogen process16US 4,439,220 AUnion Carbide Corporation · 1984