F25J 3/04721
Producing pure argon
Official title: {Producing pure argon, e.g. recovered from a crude argon column}
F25J3/04721 (Producing pure argon) appears on 112 US grants and 104 published applications in this corpus.
Search patents in F25J- Granted patents
- 112
- Published applications
- 104
- Assignees
- 22
- Inventors
- 195
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
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| 1976 | 1 | 0 |
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| 2003 | 3 | 1 |
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| 2009 | 1 | 0 |
| 2010 | 0 | 3 |
| 2011 | 0 | 1 |
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| 2015 | 3 | 5 |
| 2016 | 3 | 10 |
| 2017 | 5 | 10 |
| 2018 | 8 | 3 |
| 2019 | 4 | 7 |
| 2020 | 7 | 5 |
| 2021 | 7 | 12 |
| 2022 | 2 | 9 |
| 2023 | 7 | 8 |
| 2024 | 6 | 11 |
| 2025 | 11 | 3 |
| 2026 | 4 | 6 |
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.
- 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
- Process for cryogenic fractionation of air, air fractionation plant and integrated system composed of at least two air fractionation plants30 Dec 2025US 12,510,294 B2Linde Aktiengesellschaft
- 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
- Air separation device20 Aug 2026US 2026/0243509 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- 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
Most cited
By later US patents
- Argon purification61US 4,477,265 AAir Products and Chemicals, Inc. · 1984
- 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
- Purification of crude argon47US 4,935,044 ALinde Aktiengesellschaft · 1990
- Cryogenic hybrid system for producing high purity argon37US 5,730,003 APraxair Technology, Inc. · 1998