Neyrpic

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5376191 Amorphous alloy-based metallic finishes having wear and corrosion resistanceExpiredMay 14, 93Dec 27, 94[C22C]
4934867 Sealing device ensuring lateral tightness of a weir gateExpiredApr 03, 89Jun 19, 90[E02B]
4641040 Low-head hydroelectric installationExpiredFeb 25, 85Feb 03, 87[H01D]
4589821 High-head multistage pump-turbineExpiredJun 06, 83May 20, 86[F04D]
4422826 Propeller runner having swivelling blades for turbinesExpiredApr 08, 81Dec 27, 83[F03B]
4358767 Method of tracking for telecommunications antennaeExpiredDec 29, 80Nov 09, 82[G01S]
4316487 Tubular obturator for use with a hollow bodyExpiredMar 07, 80Feb 23, 82[F16L]
4295782 Starting of pumps or turbopumpsExpiredOct 19, 79Oct 20, 81[F03B]
4278108 Control mechanism for two cut-off devices mounted in seriesExpiredMar 10, 80Jul 14, 81[F16K]
4276905 Mechanism including two cut-off devices in seriesExpiredMar 10, 80Jul 07, 81[F16K, F03B]

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