Class E21F : SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINAGE IN OR OF MINES OR TUNNELS
Subclass 1/12: Ventilation of mines or tunnels; Distribution of ventilating currents (ventilating rooms or spaces in general F24F) Air doors (doors in general E06B) Devices for automatically opening air doors
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 10184286 | Articulated mine door opening mechanism | Nov 04, 16 | Jan 22, 19 | Jack Kennedy Metal Products & Buildings, Inc. |
| 9341061 | Method of opening a mine door leaf | Jul 01, 14 | May 17, 16 | JACK KENNEDY METAL PRODUCTS & BUILDINGS, INC., KENNEDY METAL PRODUCTS & BUILDINGS, INC., |
| 6425820 | Mine door power drive system | Mar 30, 00 | Jul 30, 02 | JACK KENNEDY METAL PRODUCTS & BUILDINGS, INC. |
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