HEIN, LEHMANN AG

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4983290 Slit-tube filterExpiredJun 30, 89Jan 08, 91[B01D]
4708795 Screening deviceExpiredMay 02, 86Nov 24, 87[B07B]
4645540 Continuously operating centrifugeExpiredFeb 19, 85Feb 24, 87[C13F]
4636304 Drum screening machineExpiredMar 22, 85Jan 13, 87[B07B]
4600506 Screening machine and methodExpiredMay 02, 85Jul 15, 86[B07B]
4473466 Flat sieve elementExpiredMar 02, 83Sep 25, 84[B07B]
4412865 Device for separating a filler massExpiredDec 12, 80Nov 01, 83[H05B, C13F]
4396503 Method and device for coating elements and screen elements made therebyExpiredAug 10, 81Aug 02, 83[B29C, B07B]
4383919 Screen bottom systemExpiredMar 09, 81May 17, 83[B07B]
4297215 Belt filter pressExpiredMar 31, 80Oct 27, 81[B01D]
4248701 Side seal assembly for a screening machineExpiredMar 30, 79Feb 03, 81[B07B]
4241767 Method and device for feeding weft wiresExpiredMar 26, 79Dec 30, 80[D03D]
4188288 Screen with tubular frame systems coupled for rectilinear motionExpiredFeb 27, 78Feb 12, 80[B07B]

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