F25J 3/04303
Lachmann expansion, i.e. expanded into oxygen producing or low pressure column
Official title: {Lachmann expansion, i.e. expanded into oxygen producing or low pressure column}
F25J3/04303 (Lachmann expansion, i.e. expanded into oxygen producing or low pressure column) appears on 359 US grants and 191 published applications in this corpus.
Search patents in F25J- Granted patents
- 359
- Published applications
- 191
- Assignees
- 49
- Inventors
- 324
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 4 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 3 | 0 |
| 1987 | 6 | 0 |
| 1988 | 6 | 0 |
| 1989 | 10 | 0 |
| 1990 | 4 | 0 |
| 1991 | 9 | 0 |
| 1992 | 13 | 0 |
| 1993 | 14 | 0 |
| 1994 | 8 | 0 |
| 1995 | 23 | 0 |
| 1996 | 13 | 0 |
| 1997 | 28 | 0 |
| 1998 | 12 | 0 |
| 1999 | 28 | 0 |
| 2000 | 12 | 0 |
| 2001 | 30 | 3 |
| 2002 | 8 | 5 |
| 2003 | 13 | 7 |
| 2004 | 4 | 3 |
| 2005 | 3 | 4 |
| 2006 | 2 | 4 |
| 2007 | 3 | 5 |
| 2008 | 0 | 8 |
| 2009 | 1 | 7 |
| 2010 | 0 | 8 |
| 2011 | 2 | 11 |
| 2012 | 2 | 5 |
| 2013 | 3 | 10 |
| 2014 | 5 | 8 |
| 2015 | 8 | 6 |
| 2016 | 4 | 16 |
| 2017 | 4 | 17 |
| 2018 | 14 | 8 |
| 2019 | 12 | 10 |
| 2020 | 8 | 6 |
| 2021 | 5 | 13 |
| 2022 | 2 | 7 |
| 2023 | 6 | 7 |
| 2024 | 6 | 8 |
| 2025 | 6 | 3 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for separating air by cryogenic distillation26 May 2026US 12,638,239 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 column8 Jul 2025US 12,352,496 B2Praxair Technology, Inc.
- Cross-corrugated packing made from metal foam29 Apr 2025US 12,285,733 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Pre-purification arrangement for air separation and method of hybrid air purification11 Mar 2025US 12,247,782 B2Air Products and Chemicals, Inc.
- Integrated nitrogen liquefier for a nitrogen and argon producing cryogenic air separation unit11 Mar 2025US 12,247,783 B2Linde Aktiengesellschaft
- Air separation method and air separation device30 Jul 2026US 2026/0218981 A1Taiyo Nippon Sanso Corporation
- Heat exchanger5 Feb 2026US 2026/0036366 A1Taiyo Nippon Sanso Corporation
- Apparatus and process for providing nitrogen and oxygen18 Sep 2025US 2025/0290692 A1Air Products and Chemicals, Inc.
- High-purity oxygen production method, and air separation device for producing high-purity oxygen12 Jun 2025US 2025/0189218 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Cryogenic air rectification system, control unit, air separation unit and method of cryogenically separating air8 May 2025US 2025/0146746 A1Linde Aktiengesellschaft
Most cited
By later US patents
- Statistical process control for air separation process99US 5,257,206 APraxair Technology, Inc. · 1993
- 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 and apparatus for purifying air to be distilled by adsorption75US 5,137,548 AL Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude · 1992
- Cryogenic system for producing low-purity oxygen70US 4,224,045 AUnion Carbide Corporation · 1980