F25J 3/04666
As a parallel working rectification column of the low pressure column in
Official title: {as a parallel working rectification column of the low pressure column in a dual pressure main column system}
F25J3/04666 (As a parallel working rectification column of the low pressure column in) appears on 308 US grants and 196 published applications in this corpus.
Search patents in F25J- Granted patents
- 308
- Published applications
- 196
- Assignees
- 30
- Inventors
- 334
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 4 | 0 |
| 1988 | 8 | 0 |
| 1989 | 12 | 0 |
| 1990 | 1 | 0 |
| 1991 | 9 | 0 |
| 1992 | 17 | 0 |
| 1993 | 13 | 0 |
| 1994 | 12 | 0 |
| 1995 | 12 | 0 |
| 1996 | 8 | 0 |
| 1997 | 14 | 0 |
| 1998 | 13 | 0 |
| 1999 | 12 | 0 |
| 2000 | 7 | 0 |
| 2001 | 22 | 3 |
| 2002 | 6 | 7 |
| 2003 | 15 | 4 |
| 2004 | 2 | 2 |
| 2005 | 1 | 2 |
| 2006 | 0 | 3 |
| 2007 | 3 | 8 |
| 2008 | 0 | 5 |
| 2009 | 5 | 3 |
| 2010 | 1 | 4 |
| 2011 | 0 | 3 |
| 2012 | 0 | 4 |
| 2013 | 2 | 4 |
| 2014 | 3 | 3 |
| 2015 | 5 | 9 |
| 2016 | 3 | 18 |
| 2017 | 4 | 12 |
| 2018 | 11 | 11 |
| 2019 | 13 | 17 |
| 2020 | 16 | 11 |
| 2021 | 9 | 16 |
| 2022 | 3 | 11 |
| 2023 | 7 | 10 |
| 2024 | 9 | 14 |
| 2025 | 12 | 6 |
| 2026 | 5 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- 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.
- Apparatus and process for improved argon recovery8 Sep 2026US 12,729,908 B2Air Products and Chemicals, Inc.
- 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 apparatus7 Apr 2026US 12,595,961 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Method for operating a process plant10 Mar 2026US 12,571,586 B2Linde Aktiengesellschaft
- Method for cryogenic separation of air, and air separation plant10 Sep 2026US 2026/0266538 A1
- Air separation method and air separation device30 Jul 2026US 2026/0218981 A1Taiyo Nippon Sanso Corporation
- Process and apparatus for producing argon by cryogenic air separation23 Jul 2026US 2026/0210624 A1
- Method for cryogenic separation of air, and air separation plant16 Jul 2026US 2026/0202125 A1Linde Aktiengesellschaft
- Air separation unit2 Apr 2026US 2026/0092735 A1L' Air Liquide, Societe Anonyme pour I' Etude et I'Exploitation des Procedes Georges Claude
Most cited
By later US patents
- Statistical process control for air separation process99US 5,257,206 APraxair Technology, Inc. · 1993
- Method for carrying out subambient temperature, especially cryogenic, separation using refrigeration from a multicomponent refrigerant fluid57US 6,053,008 APraxair Technology, Inc. · 2000
- Process for distillation of multicomponent fluid and production of an argon-enriched stream from a cryogenic air separation process57US 6,240,744 B1Air Products and Chemicals, Inc. · 2001
- Air separation process and apparatus for high argon recovery and moderate pressure nitrogen recovery46US 4,822,395 AUnion Carbide Corporation · 1989
- Low temperature air fractionation accommodating variable oxygen demand44US 5,084,081 ALinde Aktiengesellschaft · 1992