Elkem Technology a/s

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5654976 Method for melting ferrous scrap metal and chromite in a submerged arc furnace to produce a chromium containing ironExpiredApr 18, 95Aug 05, 97[F27D]
5363901 Method for detecting pinholes in continuously cast billetsExpiredNov 19, 92Nov 15, 94[G01N, B22D]
5286274 Method for treatment of potlining residue from primary aluminium smeltersExpiredNov 03, 92Feb 15, 94[C22B]
5196047 Method of treatment of zinc-containing by-products and waste materialsExpiredNov 13, 91Mar 23, 93[C22B]
5188658 Method for recovering zinc from zinc-containing waste materialsExpiredDec 14, 90Feb 23, 93[C22B]
5146469 Method and means for continuous production of carbon bodiesExpiredNov 09, 90Sep 08, 92[H05B]
5103072 Submersible plasma torchExpiredJun 18, 90Apr 07, 92[B23K]
5092564 Column for treating particulate materials with a gasExpiredJul 20, 90Mar 03, 92[C21B]
5069005 Method of flaw detection in billetsExpiredDec 18, 89Dec 03, 91[B24B]
4975116 Method for production of metals of ferroalloys by direct reductionExpiredApr 18, 89Dec 04, 90[C22B, C22C]
4831943 Treating ash and dust from incineration plants by coprocessing with hazardous waste and/or metallic scrapExpiredMay 26, 88May 23, 89[F23G]

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