NATIONAL REFRACTORIES & MINERALS CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5181319 Squeeze-on insulation for reheating furnace water cooled skid systemsExpiredJan 09, 92Jan 26, 93[B21D]
4475886 Lifter for rotary kilnExpiredMar 01, 83Oct 09, 84[F23M, F27B]
4463100 Refractory gun mixExpiredJul 08, 83Jul 31, 84[C04B]
4453352 Refractory brick with expansion allowanceExpiredAug 18, 82Jun 12, 84[E04B]
4454239 Carbonaceous refractory composition for pressing brick shapesExpiredMay 25, 83Jun 12, 84[C04B]
4328956 Taphole assembly and method of installationExpiredDec 24, 80May 11, 82[C21B]
4276091 Refractory gun mixExpiredMar 27, 80Jun 30, 81[C04B]
4244744 Refractory gun mixExpiredAug 06, 79Jan 13, 81[C04B]
4233078 Refractory composition for forming a monolithic structureExpiredJul 03, 79Nov 11, 80[C04B]
4230652 Method of repairing a refractory structureExpiredOct 20, 78Oct 28, 80[F27D]
4229423 Method of producing magnesium hydroxideExpiredFeb 09, 79Oct 21, 80[C01F]
4218256 Method of forming slide gate valve partsExpiredMar 06, 79Aug 19, 80[C04B]
4210617 Method of casting an integral slide gate and nozzleExpiredAug 03, 78Jul 01, 80[B28B]

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