E21F 3/00

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9708539 Steeping liquor used as a means of controlling the risk of fire and explosion of organic extractive materialsAug 03, 10Jul 18, 17IEC EUROPE SARL
9605512 Mine area distributed combined cooling heating power energy system for extracting gas for coal mineJan 27, 14Mar 28, 17CHINA UNIVERSITY OF MINING AND TECHNOLOGY
9551218 Optimized mine ventilation systemSep 01, 08Jan 24, 17HOWDEN ALPHAIR VENTILATING SYSTEMS INC.
8858688 Toxic gas removal and air conditioning system for human life support in enclosed refuge spacesMay 31, 12Oct 14, 14Venture Corporation Limited
8220094 Reinforced mine ventilation deviceJul 17, 09Jul 17, 12JACK KENNEDY METAL PRODUCTS & BUILDINGS, INC., KENNEDY METAL PRODUCTS & BUILDINGS, INC.,
6437457 Airfoil ventilation system for a building and the likeMar 23, 01Aug 20, 02MARQUISS WIND POWER, INC.
5385504 Permanent ventilation sealAug 30, 93Jan 31, 95CHEVRON CHEMICAL COMPANY LLC, Earth Support Systems,