F25J 3/04315
Lowest pressure or impure nitrogen, so-called waste nitrogen expansion
Official title: {Lowest pressure or impure nitrogen, so-called waste nitrogen expansion}
F25J3/04315 (Lowest pressure or impure nitrogen, so-called waste nitrogen expansion) appears on 58 US grants and 32 published applications in this corpus.
Search patents in F25J- Granted patents
- 58
- Published applications
- 32
- Assignees
- 14
- Inventors
- 80
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 3 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 7 | 0 |
| 1993 | 4 | 0 |
| 1994 | 5 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 3 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 6 | 1 |
| 2002 | 2 | 1 |
| 2003 | 1 | 1 |
| 2004 | 1 | 0 |
| 2005 | 1 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 2 |
| 2008 | 0 | 1 |
| 2009 | 1 | 1 |
| 2010 | 2 | 4 |
| 2011 | 0 | 1 |
| 2012 | 0 | 1 |
| 2013 | 1 | 1 |
| 2014 | 1 | 1 |
| 2015 | 1 | 1 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 3 |
| 2019 | 1 | 1 |
| 2020 | 1 | 1 |
| 2021 | 1 | 3 |
| 2022 | 0 | 1 |
| 2023 | 1 | 3 |
| 2024 | 2 | 2 |
| 2025 | 2 | 0 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method and plant for low temperature fractionation of air18 Aug 2026US 12,710,228 B2Linde Aktiengesellschaft
- Air separation apparatus7 Apr 2026US 12,595,961 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- 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
- Apparatus and process for liquefying gases9 Dec 2025US 12,492,864 B1
- 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.
- Air separation unit2 Apr 2026US 2026/0092735 A1L' Air Liquide, Societe Anonyme pour I' Etude et I'Exploitation des Procedes Georges Claude
- Method and plant for low temperature fractionation of air6 Jun 2024US 2024/0183610 A1Linde Aktiengesellschaft
- 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.
- Process and apparatus for cryogenic separation of air with mixed gas turbine9 Nov 2023US 2023/0358468 A1Linde Aktiengesellschaft
- Air separation apparatus7 Sep 2023US 2023/0280093 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
Most cited
By later US patents
- Integrated apparatus for generating power and/or oxygen enriched fluid and process for the operation thereof91US 6,202,442 B1L'Air Liquide Societe Anonyme Pour l'Etude et l'Expoitation des Procedes Georges Claude · 2001
- Integrated apparatus for generating power and/or oxygen enriched fluid, process for the operation thereof82US 6,276,171 B1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude · 2001
- Integrated air separation plant - integrated gasification combined cycle power generator54US 5,081,845 AAir Products and Chemicals, Inc. · 1992
- Triple column distillation system for oxygen and pressurized nitrogen production46US 5,341,646 AAir Products and Chemicals, Inc. · 1994
- Double column multiple condenser-reboiler high pressure nitrogen process37US 4,453,957 AUnion Carbide Corporation · 1984