ALSTOM T&D SA

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6295188 Method of closing a circuit breaker synchronouslyExpiredJan 11, 99Sep 25, 01[H02H]
6125692 Density sensor for monitoring the rate of leakage from a switchgear case with improved reliabilityExpiredOct 22, 98Oct 03, 00[G08B, G01M, G01L, H02B]
6091039 Gas-insulated line with an incorporated power capacitor and circuit breakerExpiredNov 05, 98Jul 18, 00[H02B, H01H]
6049050 Medium or high voltage circuit breaker including a transmission belt looped around two wheelsExpiredFeb 01, 99Apr 11, 00[H01H]
6023404 Method of monitoring and diagnosing the operation of high voltage electrical apparatusExpiredJun 03, 98Feb 08, 00[H01H]
6016247 Electricity distribution substationExpiredApr 07, 98Jan 18, 00[H02B]
5977862 Polymer high voltage current limiters packaged in seriesExpiredApr 25, 97Nov 02, 99[H01C]
5910872 Method of discriminating between an internal arc and an interruption arc detected inside a metal-clad electrical installationExpiredDec 15, 97Jun 08, 99[H02H]
5898150 Gas-blast high-voltage circuit-breakerExpiredMay 09, 97Apr 27, 99[H01H]
5841614 High voltage circuit breaker with insertion of resistance on closureExpiredMay 09, 97Nov 24, 98[H01H]
5756952 Straight spring operating mechanism for high-voltage circuit-breakersExpiredApr 09, 97May 26, 98[H01H]
5742017 Circuit-breaker provided with a closure resistance having an insertion assemblyExpiredAug 16, 96Apr 21, 98[H01H]
5729477 Method and apparatus for eliminating a disturbing component from a periodic signal, and application to an electronic capacitor voltage transformerExpiredMay 16, 95Mar 17, 98[G01R]
5717184 High-voltage circuit-breaker that inserts a resistance on closureExpiredJan 29, 97Feb 10, 98[H01H]
5693873 Method and a system for determining the density of an insulating gas in an electrical apparatusExpiredFeb 07, 96Dec 02, 97[G01N]
5684270 Joint with a boss for a long distance gas-insulated three-phase cableExpiredDec 12, 95Nov 04, 97[H02G]
5600111 Circuit-breaker having low self-compressionExpiredMay 15, 95Feb 04, 97[H01H]
5571989 Gas-insulated high-tension line for long distancesExpiredDec 20, 94Nov 05, 96[H02G]
5571990 Gas-insulated single-phase cable for transporting electricityExpiredDec 20, 94Nov 05, 96[H02G]
5569840 Screened electrical line control deviceExpiredMar 15, 95Oct 29, 96[G01M]

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