Class E21F : SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINAGE IN OR OF MINES OR TUNNELS
Subclass 1/16: Ventilation of mines or tunnels; Distribution of ventilating currents (ventilating rooms or spaces in general F24F) Shaft covers
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 11933177 | Ventilation system | Jun 01, 21 | Mar 19, 24 | 501 Toyota Jidosha Kabushiki Kaisha |
| 9447685 | Mine ventilation structure and a deck panel for such a structure | Apr 14, 15 | Sep 20, 16 | JACK KENNEDY METAL PRODUCTS & BUILDINGS, INC. |
| Publication # | Title | Filing Date | Pub Date | Patent Owner |
|---|---|---|---|---|
| 2022/0034,225 | VENTILATION SYSTEM | Jun 01, 21 | Feb 03, 22 | Not available |
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