Oy E. Sarlin AB

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4999117 Monitoring method for wastewater pump station and compatible apparatusExpiredJun 05, 89Mar 12, 91[G08B, F04B]
4676718 Impeller for a pump, especially a vortex pumpExpiredJun 03, 85Jun 30, 87[F04D]
4614478 Pump impellerExpiredMay 28, 85Sep 30, 86[F04D]
4324531 Guide apparatus for a submersible pumpExpiredDec 28, 79Apr 13, 82[F04B]
4305818 Vacuum sewage systemExpiredSep 05, 80Dec 15, 81[C02C]
4193604 Means for carrying a cable through a wallExpiredSep 21, 78Mar 18, 80[F16B]

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