E21F 1/04

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9618145 Duct with electrically conductive coatingApr 01, 14Apr 11, 17HAMILTON SUNDSTRAND CORPORATION
9447685 Mine ventilation structure and a deck panel for such a structureApr 14, 15Sep 20, 16JACK KENNEDY METAL PRODUCTS & BUILDINGS, INC.
9200815 Ventilation ducting arrangementAug 24, 12Dec 01, 15ABC INDUSTRIES, INC.
5217406 Mine ventilation tubing system and method of installationMar 17, 92Jun 08, 93PEABODY ENERGY CORPORATION
5069115 Exhaust-gas removal duct formed from individual axially mutually adjacent sections for track-forming lanesJul 18, 90Dec 03, 91DAIMLER-BENZ AKTIENGESELLSCHAFT
4361079 Apparatus for extending ventilating conduitsSep 02, 80Nov 30, 82Ruhrkohle AG, Maschinenfabrik Korfmann GmbH,
4235163 Mine face ventilation systemJul 06, 79Nov 25, 80The United States of America as represented by the Secretary of the Interior