Class E21F : SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINAGE IN OR OF MINES OR TUNNELS
Subclass 1/06: Ventilation of mines or tunnels; Distribution of ventilating currents (ventilating rooms or spaces in general F24F) Air ducts (suspension devices E21F 17/02) Duct connections (tube connections in general F16L)
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 10760420 | Underground ventilation apparatus and method | Jan 22, 16 | Sep 01, 20 | Polyvent PTY LTD |
| 10619884 | Security for grate covering underground air vents | Oct 28, 17 | Apr 14, 20 | Floodbreak, L.L.C. |
| 8925973 | System and method for connecting two flexible containers | Jun 11, 13 | Jan 06, 15 | FLECOTEC AG |
| 8721007 | Highwall mining system, conveyor segment and method for providing such a mining system | Jul 20, 04 | May 13, 14 | CATERPILLAR GLOBAL MINING HIGHWALL MINERS LLC, SHM-SYSTEMS N.V., |
| Publication # | Title | Filing Date | Pub Date | Patent Owner |
|---|---|---|---|---|
| 2017/0362,937 | UNDERGROUND VENTILATION APPARATUS AND METHOD | Jan 22, 16 | Dec 21, 17 | POLYVENT PTY LTD |
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