F25J 2215/50
Oxygen or special cases
Official title: Oxygen or special cases, e.g. isotope-mixtures or low purity O2
F25J2215/50 (Oxygen or special cases) appears on 228 US grants and 151 published applications in this corpus.
Search patents in F25J- Granted patents
- 228
- Published applications
- 151
- Assignees
- 66
- Inventors
- 322
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 3 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 7 | 0 |
| 1989 | 8 | 0 |
| 1990 | 6 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 8 | 0 |
| 1994 | 10 | 0 |
| 1995 | 11 | 0 |
| 1996 | 9 | 0 |
| 1997 | 21 | 0 |
| 1998 | 8 | 0 |
| 1999 | 18 | 0 |
| 2000 | 4 | 0 |
| 2001 | 13 | 2 |
| 2002 | 5 | 8 |
| 2003 | 11 | 4 |
| 2004 | 2 | 6 |
| 2005 | 2 | 3 |
| 2006 | 3 | 2 |
| 2007 | 3 | 2 |
| 2008 | 1 | 6 |
| 2009 | 0 | 6 |
| 2010 | 0 | 2 |
| 2011 | 3 | 6 |
| 2012 | 1 | 2 |
| 2013 | 3 | 5 |
| 2014 | 1 | 3 |
| 2015 | 2 | 3 |
| 2016 | 0 | 4 |
| 2017 | 3 | 6 |
| 2018 | 4 | 5 |
| 2019 | 8 | 7 |
| 2020 | 4 | 5 |
| 2021 | 3 | 10 |
| 2022 | 1 | 7 |
| 2023 | 5 | 17 |
| 2024 | 10 | 14 |
| 2025 | 7 | 9 |
| 2026 | 8 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Dual temperature liquid oxygen subcooling in an air separation unit22 Sep 2026US 12,742,591 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- System and method for co-production of a densified liquid oxygen product and densified liquid methane product15 Sep 2026US 12,736,280 B2Praxair Technology, Inc.
- Method and apparatus for cryogenic air separation8 Sep 2026US 12,729,907 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Apparatus and process for improved argon recovery8 Sep 2026US 12,729,908 B2Air Products and Chemicals, Inc.
- 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
- Process and apparatus for intermittent liquefaction operation that can support continuous air separation processing6 Aug 2026US 2026/0227123 A1Air Products and Chemicals, Inc.
- Hydrocarbon production system and hydrocarbon production method23 Jul 2026US 2026/0209141 A1Mitsubishi Heavy Industries, Ltd.
- Method for cryogenic separation of air, and air separation plant16 Jul 2026US 2026/0202125 A1Linde Aktiengesellschaft
- Method for increasing production flexibility of an air separation unit28 May 2026US 2026/0146790 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- High-purity oxygen production apparatus5 Mar 2026US 2026/0063360 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
Most cited
By later US patents
- Liquid oxygen production77US 6,212,904 B1In-X Corporation · 2001
- Advanced hybrid coal gasification cycle utilizing a recycled working fluid63US 6,877,322 B2Foster Wheeler Energy Corporation · 2005
- Compact small volume liquid oxygen production system60US 5,893,275 AIn-X Corporation · 1999
- Efficient process to produce oxygen48US 5,966,967 AAir Products and Chemicals, Inc. · 1999
- Chemical process optimization method46US 5,315,521 APraxair Technology, Inc. · 1994