Northwest Aluminum Technologies

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
2007/0278,107 Anode for use in aluminum producing electrolytic cellAbandonedMay 30, 06Dec 06, 07[C25C, C25B]
7077945 Cu--Ni--Fe anode for use in aluminum producing electrolytic cellExpiredMay 08, 03Jul 18, 06[C25C]
6866768 Electrolytic cell for production of aluminum from aluminaExpiredMar 14, 03Mar 15, 05[C25C]
6837982 Maintaining molten salt electrolyte concentration in aluminum-producing electrolytic cellExpiredJan 25, 02Jan 04, 05[C25C]
6811676 Electrolytic cell for production of aluminum from aluminaExpiredJul 16, 02Nov 02, 04[C25C]
6800191 Electrolytic cell for producing aluminum employing planar anodesExpiredMar 15, 02Oct 05, 04[C25C]
6719889 Cathode for aluminum producing electrolytic cellExpiredApr 22, 02Apr 13, 04[B25D, C25C]
6719890 Cathode for a hall-heroult type electrolytic cell for producing aluminumExpiredApr 22, 02Apr 13, 04[C25C]
6558525 Anode for use in aluminum producing electrolytic cellExpiredMar 01, 02May 06, 03[C25C]
2003/0057,102 Temperature control for low temperature reduction cellAbandonedSep 24, 01Mar 27, 03[C25C]
6497807 Electrolyte treatment for aluminum reductionExpiredNov 25, 00Dec 24, 02[C25C]
6485628 Bath for electrolytic reduction of alumina and method thereforExpiredNov 25, 00Nov 26, 02[C25C]
6436272 Low temperature aluminum reduction cell using hollow cathodeExpiredOct 04, 00Aug 20, 02[C25C]
6419812 Aluminum low temperature smelting cell metal collectionExpiredNov 27, 00Jul 16, 02[C25C]
6419813 Cathode connector for aluminum low temperature smelting cellExpiredNov 25, 00Jul 16, 02[C25C]
6379512 Combination for electrolytic reduction of aluminaExpiredNov 25, 00Apr 30, 02[C25C, C25B]
6258247 Bath for electrolytic reduction of alumina and method thereforExpiredFeb 09, 99Jul 10, 01[C25C]

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