E21F 1/08

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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
2022/0268,158 FLOOD PROTECTION FOR UNDERGROUND AIR VENTSFeb 18, 22Aug 25, 22Not available
2021/0156,252 SYSTEM AND METHOD FOR DUCTED VENTILATIONFeb 22, 18May 27, 21Not available
2019/0201,827 Dry Filter with Enhanced Separation Output and Convenient DimensionsJan 03, 19Jul 04, 19Not available
2016/0025,105 ENERGY-EFFICIENT TUNNEL VENTILATION DEVICEJan 17, 14Jan 28, 16MOSEN LTD
2014/0349,562 Change Over Station and MethodMay 13, 14Nov 27, 14STRATA PRODUCTS WORLDWIDE, LLC
2013/0340,872 SYSTEM AND APPARATUS FOR CONNECTING A GAS SOURCE TO A THERMAL OXIDISERNov 24, 11Dec 26, 13CORKY'S MANAGEMENT SERVICES PTY LTD
2008/0254,733 Airflow RegulatorApr 12, 06Oct 16, 08MINOVA INTERNATIONAL LIMITED