LEWA Herbert Ott GmbH + Co. KG

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6598493 Multiple crank drive for working machines, in particular for diaphragm pumpsExpiredMay 15, 01Jul 29, 03[F16H]
6582206 Diaphragm chucking with elasticity adjustmentExpiredMar 15, 01Jun 24, 03[F04B]
6327960 Diaphragm pump with a hydraulically driven diaphragmExpiredJan 19, 00Dec 11, 01[F16J]
5899671 Hydraulic driven diaphragm pump with mechanical diaphragm stroke limitationExpiredJun 19, 97May 04, 99[F04B]
5810567 Hydraulic Diaphragm pumpExpiredJun 19, 97Sep 22, 98[F04B]
5246351 Hydraulically driven diaphragm pump with diaphragm stroke limitationExpiredNov 30, 92Sep 21, 93[F04B]
5188515 Diaphragm for an hydraulically driven diaphragm pumpExpiredJun 03, 91Feb 23, 93[F04B]
5074757 Diaphragm pump with mechanically driven diaphragmExpiredSep 17, 90Dec 24, 91[F04B]
5047950 Method and an apparatus for measuring the flow in oscillating displacement pumpsExpiredJun 02, 89Sep 10, 91[G01L]
4865528 Method and arrangement for starting an hydraulic diaphragm pump against loadExpiredMar 18, 88Sep 12, 89[F04B]
4832581 Diaphragm pump with circulation flushingExpiredDec 23, 85May 23, 89[F04B]
4811624 Hydraulically actuated stroke adjusting deviceExpiredFeb 10, 86Mar 14, 89[G05G]
4749342 Diaphragm pump with hydraulically driven rolling diaphragmExpiredDec 23, 85Jun 07, 88[F04B]
4430048 Diaphragm pump with a diaphragm clamped in pressure-balancing arrangementExpiredDec 29, 81Feb 07, 84[F04B]

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