E21F 3/00
Cooling or drying of air
Official title: Cooling or drying of air (air-conditioning rooms or spaces in general F24F)
E21F3/00 (Cooling or drying of air) appears on 19 US grants and 17 published applications in this corpus.
Search patents in E21F- Granted patents
- 19
- Published applications
- 17
- Assignees
- 23
- Inventors
- 66
- Latest grant
- 11 Feb 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 3 |
| 2013 | 1 | 0 |
| 2014 | 1 | 1 |
| 2015 | 0 | 3 |
| 2016 | 1 | 5 |
| 2017 | 1 | 1 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 2 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Mine cooling and dehumidifying system11 Feb 2025US 12,221,889 B2Shandong University of Science and Technology
- Method for cooling a refuge chamber in an emergency situation25 Dec 2018US 10,161,248 B2Dräger Safety AG & Co. KGaA
- Mine area distributed combined cooling heating power energy system for extracting gas for coal mine28 Mar 2017US 9,605,512 B2China University of Mining and Technology
- Personal safety system15 Mar 2016US 9,284,840 B2Dräger Safety AG & Co. KGaA
- Toxic gas removal and air conditioning system for human life support in enclosed refuge spaces14 Oct 2014US 8,858,688 B2Venture Corporation Limited
- Mine cooling and dehumidifying system9 Jan 2025US 2025/0012190 A1Shandong University of Science and Technology
- Apparatus powered by compressed fluid25 Nov 2021US 2021/0364194 A1Cool Mine Pty Ltd
- Multilevel deep well cooling and geothermal utilization system and process10 Jun 2021US 2021/0172319 A1China University of Mining and Technology
- Tunnel fan and method30 Nov 2017US 2017/0341094 A1Twin City Fan Companies, Ltd.
- Method for cooling a refuge chamber in an emergency situation30 Jun 2016US 2016/0186565 A1Dräger Safety AG & Co. KGaA
Most cited
By later US patents
- Process and apparatus for reducing the air cooling and water removal requirements of deep-level mines19US 5,251,458 A1993
- Fluid transfer system11US 6,033,192 ANicro Industrial Close Corporation · 2000
- Toxic gas removal and air conditioning system for human life support in enclosed refuge spaces9US 8,858,688 B2Venture Corporation Limited · 2014
- Deep mine cooling system8US 4,480,444 AAlsthom-Atlantique · 1984
- Integrated mine cooling and water conditioning system8US 4,750,333 AChicago Bridge & Iron Company · 1988