Gosudarstvenny Proektnokonstruktorsky I Experimentalny Institut Ugolnogo Mashinostroenia

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4871448 Mechanical flotation machineExpiredJun 14, 88Oct 03, 89[B03D]
4844548 Haulage unit of a coal-getting machineExpiredMar 30, 88Jul 04, 89[E21C]
4768835 Advancing system for coal winning machineExpiredOct 15, 86Sep 06, 88[E21C]
4648659 Method and hydraulic system for controlling supply of fluid to combine for extracting mineralsExpiredAug 21, 84Mar 10, 87[E21F, E21C]
4508391 Mining machine for extraction of mineralsExpiredOct 19, 82Apr 02, 85[E21C]
4488757 Plough mining installationExpiredApr 21, 83Dec 18, 84[E21C]

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