F25J 2215/44
Ultra high purity nitrogen, i.e. generally less than 1 ppb impurities
F25J2215/44 (Ultra high purity nitrogen, i.e. generally less than 1 ppb impurities) appears on 95 US grants and 24 published applications in this corpus.
Search patents in F25J- Granted patents
- 95
- Published applications
- 24
- Assignees
- 25
- Inventors
- 145
- Latest grant
- 16 Apr 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
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| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
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| 1992 | 6 | 0 |
| 1993 | 5 | 0 |
| 1994 | 10 | 0 |
| 1995 | 7 | 0 |
| 1996 | 5 | 0 |
| 1997 | 8 | 0 |
| 1998 | 5 | 0 |
| 1999 | 7 | 0 |
| 2000 | 4 | 0 |
| 2001 | 2 | 2 |
| 2002 | 5 | 1 |
| 2003 | 4 | 2 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 2 | 2 |
| 2010 | 0 | 1 |
| 2011 | 1 | 3 |
| 2012 | 0 | 0 |
| 2013 | 1 | 1 |
| 2014 | 1 | 1 |
| 2015 | 1 | 0 |
| 2016 | 1 | 0 |
| 2017 | 1 | 1 |
| 2018 | 0 | 2 |
| 2019 | 1 | 1 |
| 2020 | 1 | 1 |
| 2021 | 1 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 1 | 1 |
| 2025 | 0 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Air separation unit and method for production of high purity nitrogen product using a distillation column system with an intermediate pressure kettle column16 Apr 2024US 11,959,701 B2Praxair Technology, Inc.
- Nitrogen production system for producing nitrogen with different purities and nitrogen production process thereof19 Oct 2021US 11,150,016 B2L'Air Societe Anonyme Pour L'Etude Et L'Exploitation Des Procedes Georges Claude
- System and method for enhanced recovery of argon and oxygen from a nitrogen producing cryogenic air separation unit26 May 2020US 10,663,224 B2Praxair Technology, Inc.
- Process for increasing low pressure pure nitrogen production by revamping original apparatus for cryogenic air separation17 Dec 2019US 10,508,859 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Liquid nitrogen production8 Aug 2017US 9,726,427 B1Cosmodyne, LLC
- System and method for simultaneously producing high-purity liquid nitrogen and high-purity liquid carbon dioxide at low cost by using flue gas26 Feb 2026US 2026/0055956 A1Hangzhou Oxygen Plant Group Co., Ltd.
- Apparatus and process for providing nitrogen and oxygen18 Sep 2025US 2025/0290692 A1Air Products and Chemicals, Inc.
- Air separation unit and method for production of high purity nitrogen product using a distillation column system with an intermediate pressure kettle column1 Feb 2024US 2024/0035742 A1Praxair Technology, Inc.
- System and method for enhanced recovery of argon and oxygen from a nitrogen producing cryogenic air separation unit14 May 2020US 2020/0149806 A1
- System and method for enhanced recovery of argon and oxygen from a nitrogen producing cryogenic air separation unit31 Oct 2019US 2019/0331416 A1Praxair Technology, Inc.
Most cited
By later US patents
- Apparatus for low temperature purification of gases78US 5,202,096 AThe BOC Group, Inc. · 1993
- Air purification process72US 5,914,455 AThe BOC Group, Inc. · 1999
- Low temperature purification of gases39US 5,110,569 AThe BOC Group, Inc. · 1992
- Production of liquid oxygen and/or liquid nitrogen37US 4,152,130 AAir Products and Chemicals, Inc. · 1979
- Process for the purification of the inert gases34US 5,204,075 AThe BOC Group, Inc. · 1993