GOUVERNEMENT DU QUEBEC

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4700898 Concentration of silicon carbideExpiredMay 08, 86Oct 20, 87[B02L]
4440734 Process for the recovery of sulfuric acidExpiredFeb 11, 82Apr 03, 84[C01C, C01B]
4431615 Process for the recovery of magnesium and/or nickel by liquid-liquid extractionExpiredSep 29, 82Feb 14, 84[C01G, C01F]

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