VSESOJUZNOE NAUCHNO-PROIZVODSTVENNOE OBIEDINENIE SOJUZPROMGAZ, USSR, MOSCOW

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4610303 Method of underground gasification of a series of gently dipping and inclined coal seamsExpiredNov 16, 84Sep 09, 86[E21B, E21C]
4573531 Method of underground gasification of coal seamExpiredFeb 09, 84Mar 04, 86[E21B]

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