| 2024/0141,788 | SYSTEMS AND METHODS FOR MEASURING MINE TUNNEL ENVIRONMENTAL INFORMATION | Oct 28, 22 | May 02, 24 | Not available |
| 2023/0175,398 | Three-Dimensional Ventilation Method And System For Mining By 110 Construction Method In Coal And Gas Outburst Mines | Apr 30, 21 | Jun 08, 23 | Not available |
| 2023/0103,613 | A Kind of No-Pillar and Gob-Side Entry Retaining Mining and Construction Method without the Mining Area Division | Mar 24, 20 | Apr 06, 23 | Not available |
| 2022/0154,577 | ROADWAY CONDUIT SYSTEMS AND METHODS | Dec 27, 21 | May 19, 22 | Not available |
| 2020/0256,190 | ROADWAY CONDUIT SYSTEMS AND METHODS | Feb 14, 20 | Aug 13, 20 | Not available |
| 2020/0182,056 | OPTIMISED TUNNEL VENTILATION DEVICE | Feb 21, 18 | Jun 11, 20 | Not available |
| 2020/0049,007 | Optimized Mine Ventilation System | Oct 22, 19 | Feb 13, 20 | Not available |
| 2019/0360,335 | ROADWAY CONDUIT SYSTEMS AND METHODS | Aug 09, 19 | Nov 28, 19 | Not available |
| 2019/0249,552 | ROADWAY CONDUIT SYSTEMS AND METHODS | Dec 03, 18 | Aug 15, 19 | Not available |
| 2019/0249,551 | ROADWAY CONDUIT SYSTEMS AND METHODS | Jul 24, 18 | Aug 15, 19 | Not available |
| 2017/0362,937 | UNDERGROUND VENTILATION APPARATUS AND METHOD | Jan 22, 16 | Dec 21, 17 | POLYVENT PTY LTD |
| 2017/0341,094 | TUNNEL FAN AND METHOD | May 26, 17 | Nov 30, 17 | TWIN CITY FAN COMPANIES, LTD. |
| 2017/0321,553 | RAILROAD PLATFORM DOOR ARRANGEMENT | Apr 25, 17 | Nov 09, 17 | Not available |
| 2017/0183,967 | MODULAR CONTROLLING SYSTEM FOR VENTILATION EQUIPMENT AND METHODS OF USING THE SAME | May 11, 15 | Jun 29, 17 | Not available |
| 2017/0159,435 | System for Filtering the Fresh Air Flowing in a Tunnel and/or the Exhaust Gases Flowing out Therefrom | Jun 25, 15 | Jun 08, 17 | Not available |
| 2017/0089,200 | Optimized Mine Ventilation System | Dec 12, 16 | Mar 30, 17 | HOWDEN ALPHAIR VENTILATING SYSTEMS INC. |
| 2016/0305,244 | SYSTEM AND METHOD FOR EXTRACTION OF SMOKE FROM ROAD TUNNELS | Dec 05, 14 | Oct 20, 16 | Tunnel Air Systems AS |
| 2016/0024,922 | ENSURING WORKING CONDITIONS ALONG A LONGWALL FACE | Mar 11, 14 | Jan 28, 16 | CATERPILLAR GLOBAL MINING EUROPE GMBH |
| 2015/0110,561 | STRUCTURE FOR REDUCING TUNNEL MICRO PRESSURE WAVE INCLUDING AIR PIPE | Oct 17, 14 | Apr 23, 15 | KOREA RAILROAD RESEARCH INSTITUTE |
| 2014/0349,562 | Change Over Station and Method | May 13, 14 | Nov 27, 14 | STRATA PRODUCTS WORLDWIDE, LLC |