Description
Class E21F : SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINAGE IN OR OF MINES OR TUNNELS
Subclass 3/00: Cooling or drying of air (air-conditioning rooms or spaces in general F24F)
E21F 3/00
Sub-Class
Stats
- 9 US PATENTS IN FORCE
- 3 US APPLICATIONS PENDING
- 9 Total Patent Owners
- 35 TOTAL INVENTORS
Recent Patents
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 12221889 | Mine cooling and dehumidifying system | Jun 28, 24 | Feb 11, 25 | Shandong University of Science and Technology |
| 10900357 | Blowing curtain face ventilation system for extended cut mining using passive regulator | May 01, 14 | Jan 26, 21 | The University of Kentucky Research Foundation |
| 10161248 | Method for cooling a refuge chamber in an emergency situation | Aug 20, 14 | Dec 25, 18 | Dräger Safety AG & Co. KGaA |
| 9708539 | Steeping liquor used as a means of controlling the risk of fire and explosion of organic extractive materials | Aug 03, 10 | Jul 18, 17 | IEC EUROPE SARL |
| 9605512 | Mine area distributed combined cooling heating power energy system for extracting gas for coal mine | Jan 27, 14 | Mar 28, 17 | CHINA UNIVERSITY OF MINING AND TECHNOLOGY |
| 9551218 | Optimized mine ventilation system | Sep 01, 08 | Jan 24, 17 | HOWDEN ALPHAIR VENTILATING SYSTEMS INC. |
| 8858688 | Toxic gas removal and air conditioning system for human life support in enclosed refuge spaces | May 31, 12 | Oct 14, 14 | Venture Corporation Limited |
| 8220094 | Reinforced mine ventilation device | Jul 17, 09 | Jul 17, 12 | JACK KENNEDY METAL PRODUCTS & BUILDINGS, INC., KENNEDY METAL PRODUCTS & BUILDINGS, INC., |
| 5385504 | Permanent ventilation seal | Aug 30, 93 | Jan 31, 95 | CHEVRON CHEMICAL COMPANY LLC, Earth Support Systems, |
Recent Publications
| Publication # | Title | Filing Date | Pub Date | Patent Owner |
|---|---|---|---|---|
| 2021/0172,319 | MULTILEVEL DEEP WELL COOLING AND GEOTHERMAL UTILIZATION SYSTEM AND PROCESS | Apr 18, 19 | Jun 10, 21 | CHINA UNIVERSITY OF MINING AND TECHNOLOGY |
| 2017/0341,094 | TUNNEL FAN AND METHOD | May 26, 17 | Nov 30, 17 | TWIN CITY FAN COMPANIES, LTD. |
| 2016/0115,790 | Hydraulic Gas Compressors and Applications Thereof | Jun 10, 14 | Apr 28, 16 | Not available |
Top Owners in This Subclass
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Patents Issued To Date - By Filing Year
Average Time to Issuance
- 36 Months (last 2 years Issuances)
- 36 Months (last 5 years Issuances)