F25J 3/04781
Pressure changing devices
Official title: {Pressure changing devices, e.g. for compression, expansion, liquid pumping}
F25J3/04781 (Pressure changing devices) appears on 76 US grants and 83 published applications in this corpus.
Search patents in F25J- Granted patents
- 76
- Published applications
- 83
- Assignees
- 30
- Inventors
- 166
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 6 | 0 |
| 2002 | 1 | 2 |
| 2003 | 2 | 2 |
| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
| 2006 | 2 | 2 |
| 2007 | 0 | 1 |
| 2008 | 1 | 1 |
| 2009 | 0 | 6 |
| 2010 | 1 | 3 |
| 2011 | 3 | 4 |
| 2012 | 1 | 5 |
| 2013 | 1 | 4 |
| 2014 | 1 | 2 |
| 2015 | 5 | 4 |
| 2016 | 3 | 9 |
| 2017 | 3 | 2 |
| 2018 | 2 | 4 |
| 2019 | 6 | 7 |
| 2020 | 6 | 5 |
| 2021 | 2 | 3 |
| 2022 | 1 | 2 |
| 2023 | 1 | 3 |
| 2024 | 5 | 5 |
| 2025 | 1 | 3 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Nitrogen generating device and nitrogen generating method31 Mar 2026US 12,590,758 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Apparatus and process for liquefying gases9 Dec 2025US 12,492,864 B1
- Apparatus and method for separation of air by cryogenic distillation31 Dec 2024US 12,181,217 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Cooling arrangement and method for cooling an at least two-stage compressed air generator10 Dec 2024US 12,163,511 B2Gardner Denver Deutschland GmbH
- System and method for supplying backup production in air separation device26 Nov 2024US 12,152,834 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Apparatus and method for maintaining or increasing liquid production of an air separation unit9 Jul 2026US 2026/0194295 A1Air Liquide Large Industries U.S. LP
- 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
- Air separation unit2 Apr 2026US 2026/0092735 A1L' Air Liquide, Societe Anonyme pour I' Etude et I'Exploitation des Procedes Georges Claude
- Air separation method and plant18 Dec 2025US 2025/0383144 A1Linde Aktiengesellschaft
- Cryogenic Expansion Turbine with Magnetic Bearings19 Jun 2025US 2025/0198303 A1
Most cited
By later US patents
- Clean air engines transportation and other power applications153US 5,680,764 AClean Energy Systems, Inc. · 1997
- Turbine/motor (generator) driven booster compressor74US 5,924,307 APraxair Technology, Inc. · 1999
- Tonnage nitrogen air separation with side reboiler condenser35US 4,617,036 AAir Products and Chemicals, Inc. · 1986
- System for compressing air and extracting nitrogen from compressed air31US 5,496,388 AAir Liquide America Corporation · 1996
- Cryogenic rectification system for producing high pressure gaseous oxygen and liquid product27US 5,655,388 APraxair Technology, Inc. · 1997