E21F 1/04

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
2025/0067,180 COAL AND GAS OUTBURST MONITORING DEVICEAug 16, 24Feb 27, 25Not available
2024/0101,162 TRACK STRUCTURE WITH CENTER RAILSep 27, 23Mar 28, 24RIINO Inc.
2024/0003,254 VERTICAL ORTHOGONAL TOP EXHAUSTING AIR DUCT STRUCTURE OF DEEPLY-BURIED SUBWAY STATION AND CONSTRUCTION METHOD THEREFORJul 03, 23Jan 04, 24BEIJING URBAN CONSTRUCTION DESIGN & DEVELOPMENT GROUP CO. LIMITED;
2023/0340,878 COLLABORATIVE EROSION-CONTROL METHOD OF RELEASING-SPLITTING -SUPPORTING BASED ON COAL MASS PRESSURE RELIEF AND ROOF PRE-SPLITTINGMar 03, 23Oct 26, 23Not available
2020/0217,202 GROUND WELLHOLE DEDICATED PROTECTIVE PIPE FOR GAS EXTRACTION OF MINING-INDUCED AREAJul 13, 18Jul 09, 20Not available
2018/0003,058 VENTILATION DUCTJun 29, 17Jan 04, 18HIRAM (WA) PTY LTD
2016/0333,692 VENTILATION DUCTING SYSTEMS & METHODSJan 12, 15Nov 17, 16Not available