National Institute for Metallurgy

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4431613 Leaching of sulphidic mattes containing non-ferrous metals and ironExpiredOct 12, 82Feb 14, 84[C01G]
4401629 Selective imidazole ion exchange resinsExpiredMar 10, 81Aug 30, 83[C08F, B01J]
4330379 Leaching of zinc containing sulphide mineralsExpiredFeb 03, 81May 18, 82[C25C]
4296269 Control of electrical arc furnacesExpiredJun 13, 78Oct 20, 81[H05B]
4274931 Leaching process for zinc sulphide containing materialsExpiredJan 18, 80Jun 23, 81[C25C]
4260477 Magnetic separatorsExpiredMar 05, 79Apr 07, 81[B03C]
4227030 Arc furnace electrode slip monitoring deviceExpiredJun 29, 79Oct 07, 80[H05B]
4202944 Selective ion exchange resins with pyridyl-imidazolyl chelating functional groupsExpiredSep 07, 78May 13, 80[C08F, B01D]
4188362 Process for the treatment of platinum group metals and goldExpiredJun 28, 78Feb 12, 80[C01G]

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