I.S.C. Smelting Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4478794 Roasting of mixed sulphide ores or concentratesExpiredMar 03, 83Oct 23, 84[C22B, C01G]
4371151 Blast furnace smelting of zincExpiredAug 01, 78Feb 01, 83[F27B]
4369164 Recovery of copper from arsenical drosses by ammonium arsenate leachExpiredDec 04, 81Jan 18, 83[C22B, C01G]
4340423 Charging of zinc-smelting blast furnacesExpiredFeb 26, 81Jul 20, 82[C22B]
4261743 Pyrometalurgical smelting of lead and copperExpiredMay 17, 79Apr 14, 81[C22C]
4231791 Roasting of sulphide materialsExpiredJul 05, 79Nov 04, 80[C22B]

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