F25J 3/0443
A main column system not otherwise provided
Official title: {A main column system not otherwise provided, e.g. a modified double column flowsheet}
F25J3/0443 (A main column system not otherwise provided) appears on 58 US grants and 36 published applications in this corpus.
Search patents in F25J- Granted patents
- 58
- Published applications
- 36
- Assignees
- 24
- Inventors
- 82
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 5 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 4 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 1 |
| 2002 | 2 | 1 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 0 | 2 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 2 |
| 2014 | 0 | 0 |
| 2015 | 1 | 2 |
| 2016 | 1 | 2 |
| 2017 | 1 | 3 |
| 2018 | 1 | 0 |
| 2019 | 4 | 1 |
| 2020 | 1 | 3 |
| 2021 | 1 | 1 |
| 2022 | 1 | 3 |
| 2023 | 2 | 1 |
| 2024 | 1 | 5 |
| 2025 | 0 | 3 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Air separation unit and air separation method25 Aug 2026US 12,716,651 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Method and plant for low temperature fractionation of air18 Aug 2026US 12,710,228 B2Linde Aktiengesellschaft
- Multistage liquid storage-type condenser-evaporator and nitrogen production device using the same29 Oct 2024US 12,130,081 B2Taiyo Nippon Sanso Corporation
- Method and unit for low-temperature air separation19 Dec 2023US 11,846,468 B2Linde Aktiengesellschaft
- Cryogenic air separation apparatus10 Jan 2023US 11,549,747 B2L'Air Liquide, Societe Anonyme Pour L'Etude Et L'Exploitation Des Procedes Geordes Claude
- Process and apparatus for intermittent liquefaction operation that can support continuous air separation processing6 Aug 2026US 2026/0227123 A1Air Products and Chemicals, Inc.
- High-purity oxygen production apparatus5 Mar 2026US 2026/0063360 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Process and plant for providing a nitrogen product, an oxygen product and a hydrogen product28 Aug 2025US 2025/0271208 A1Linde Aktiengesellschaft
- 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
- Nitrogen generating device and nitrogen generating method20 Feb 2025US 2025/0060158 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
Most cited
By later US patents
- Production of ultra-high purity oxygen from cryogenic air separation plants31US 5,049,173 AAir Products and Chemicals, Inc. · 1991
- High purity nitrogen and oxygen gas production equipment29US 4,853,015 ADaidousanso Co., Ltd. · 1989
- Process to produce ultrahigh purity oxygen27US 4,560,397 AUnion Carbide Corporation · 1985
- Air separation schemes for oxygen and nitrogen coproduction as gas and/or liquid products24US 5,355,681 AAir Products and Chemicals, Inc. · 1994
- High-purity nitrogen gas production equipment23US 4,668,260 ADaidousanso Co., Ltd. · 1987