| 2025/0101,870 | ROADWAY CONDUIT SYSTEMS AND METHODS | Aug 12, 24 | Mar 27, 25 | Not available |
| 2025/0067,180 | COAL AND GAS OUTBURST MONITORING DEVICE | Aug 16, 24 | Feb 27, 25 | Not available |
| 2025/0012,190 | MINE COOLING AND DEHUMIDIFYING SYSTEM | Jun 28, 24 | Jan 09, 25 | Not available |
| 2024/0360,759 | ROADWAY CONDUIT SYSTEMS AND METHODS | Jul 03, 24 | Oct 31, 24 | Not available |
| 2024/0310,006 | METHODS AND SYSTEMS FOR SUPERVISING SAFETY VENTILATION OF UNDERGROUND GAS PIPELINE CORRIDORS BASED ON INTERNET OF THINGS | May 21, 24 | Sep 19, 24 | CHENGDU QINCHUAN IOT TECHNOLOGY CO., LTD. |
| 2024/0200,453 | METHOD AND APPARATUS FOR FIRE VENTILATION AND SMOKE EVACUATION IN RUNNING TRAIN TUNNEL | Dec 19, 23 | Jun 20, 24 | Not available |
| 2024/0159,149 | ROADWAY CONDUIT SYSTEMS AND METHODS | Aug 29, 23 | May 16, 24 | Not available |
| 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 |