F25J 3/04642
Recovering noble gases from air
Official title: {Recovering noble gases from air (from gas mixtures other than air F25J3/028 or F25J3/0685)}
F25J3/04642 (Recovering noble gases from air) appears on 445 US grants and 262 published applications in this corpus.
Search patents in F25J- Granted patents
- 445
- Published applications
- 262
- Assignees
- 49
- Inventors
- 471
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 4 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 8 | 0 |
| 1987 | 5 | 0 |
| 1988 | 14 | 0 |
| 1989 | 18 | 0 |
| 1990 | 5 | 0 |
| 1991 | 14 | 0 |
| 1992 | 20 | 0 |
| 1993 | 17 | 0 |
| 1994 | 15 | 0 |
| 1995 | 17 | 0 |
| 1996 | 11 | 0 |
| 1997 | 20 | 0 |
| 1998 | 16 | 0 |
| 1999 | 20 | 0 |
| 2000 | 11 | 0 |
| 2001 | 33 | 4 |
| 2002 | 12 | 8 |
| 2003 | 17 | 7 |
| 2004 | 6 | 5 |
| 2005 | 3 | 2 |
| 2006 | 0 | 6 |
| 2007 | 4 | 10 |
| 2008 | 0 | 6 |
| 2009 | 7 | 4 |
| 2010 | 1 | 7 |
| 2011 | 0 | 7 |
| 2012 | 1 | 4 |
| 2013 | 4 | 5 |
| 2014 | 4 | 6 |
| 2015 | 7 | 11 |
| 2016 | 4 | 23 |
| 2017 | 6 | 13 |
| 2018 | 11 | 16 |
| 2019 | 17 | 19 |
| 2020 | 19 | 15 |
| 2021 | 11 | 19 |
| 2022 | 5 | 15 |
| 2023 | 10 | 14 |
| 2024 | 13 | 17 |
| 2025 | 15 | 8 |
| 2026 | 6 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for configuring a control system for a process plant29 Sep 2026US 12,747,912 B2Linde Aktiengesellschaft
- 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 cryogenic separation of air, and air separation plant10 Sep 2026US 2026/0266538 A1
- Method for cryogenic separation of air, and air separation system10 Sep 2026US 2026/0266539 A1Linde Aktiengesellschaft
- Method for obtaining xenon using a molecular sieve20 Aug 2026US 2026/0242223 A1Linde Aktiengesellschaft
- Air separation device20 Aug 2026US 2026/0243509 A1L 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.
Most cited
By later US patents
- Statistical process control for air separation process99US 5,257,206 APraxair Technology, Inc. · 1993
- Argon purification61US 4,477,265 AAir Products and Chemicals, Inc. · 1984
- 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
- Process for removing oxygen from crude argon50US 5,035,726 AAir Products and Chemicals, Inc. · 1991