E21F 1/18

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Description

Class  E21F : SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINAGE IN OR OF MINES OR TUNNELS


Subclass 1/18: Ventilation of mines or tunnels; Distribution of ventilating currents (ventilating rooms or spaces in general F24F) Gravity-flow ventilation (E21F 1/02-E21F 1/16 take precedence)

Recent Patents

Patent #TitleFiling DateIssue DatePatent Owner
12221888 Ventilation method for high gas working face based on alternating intake and air return in mine gallerySep 13, 24Feb 11, 25Taiyuan University of Technology

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