E21F 3/00

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
2025/0012,190 MINE COOLING AND DEHUMIDIFYING SYSTEMJun 28, 24Jan 09, 25Not available
2021/0172,319 MULTILEVEL DEEP WELL COOLING AND GEOTHERMAL UTILIZATION SYSTEM AND PROCESSApr 18, 19Jun 10, 21CHINA UNIVERSITY OF MINING AND TECHNOLOGY
2017/0341,094 TUNNEL FAN AND METHODMay 26, 17Nov 30, 17TWIN CITY FAN COMPANIES, LTD.
2016/0115,790 Hydraulic Gas Compressors and Applications ThereofJun 10, 14Apr 28, 16Not available
2004/0093,883 Air-conditioning apparatusMar 04, 03May 20, 04MITSUBISHI HEAVY INDUSTRIES, LTD.
2003/0132,224 Oil and gas well alloy squeezing method and apparatusSep 19, 02Jul 17, 03CANITRON SYSTEMS INC.