Kvafrner Technology and Research Ltd.

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Patent Activity in the Last 10 Years

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6773689 Carbon media for storage of hydrogenExpiredMar 29, 01Aug 10, 04[C01B]
6328892 Liquid effluent treatment process and plantExpiredNov 22, 00Dec 11, 01[C02F]
6295909 Shearing metal stripExpiredMar 08, 00Oct 02, 01[B26D]
6214228 Liquid effluent treatment plant and processExpiredMar 11, 99Apr 10, 01[C02F]
6155965 Treatment of fly ashExpiredSep 19, 97Dec 05, 00[A62D]
5996384 Hot flat rolling mill stand and control method and apparatus thereforExpiredJul 21, 98Dec 07, 99[B21C]
5997837 Method for decomposition of hydrocarbonsExpiredDec 19, 96Dec 07, 99[C09C]
5989512 Method and device for the pyrolytic decomposition of hydrocarbonsExpiredJun 02, 95Nov 23, 99[C09C]
5983707 Rotor for a shapemeterExpiredMay 19, 98Nov 16, 99[G01B]
5967448 Metal strip shearing and coilingExpiredJul 20, 98Oct 19, 99[B65H]
5964278 Heat exchangerExpiredFeb 04, 97Oct 12, 99[F28F]
5951960 Electrode consumption in plasma torchesExpiredSep 15, 97Sep 14, 99[C09C]
5725616 Method for combustion of hydrocarbonsExpiredJan 03, 96Mar 10, 98[C01B]
5527518 Production of carbon blackExpiredDec 22, 94Jun 18, 96[C09C]
5500501 Torch device for chemical processesExpiredJan 10, 95Mar 19, 96[B23K]
5486674 Plasma torch device for chemical processesExpiredDec 29, 94Jan 23, 96[B23K]
5481080 Plasma torch with a lead-in tubeExpiredAug 12, 94Jan 02, 96[B23K]

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