Dorr-Oliver Incorporated

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5389249 Clarifier with rotating sealed coverExpiredDec 01, 93Feb 14, 95[B01D]
5368731 Vacuum assisted slaker classifierExpiredOct 04, 93Nov 29, 94[C04B, C01F, B01D]
5326471 Microstrainer filter deck panelExpiredDec 18, 92Jul 05, 94[B01D]
5300233 Process of displacement washing in a centrifuge filterExpiredFeb 09, 93Apr 05, 94[B01D]
5284249 Direct hydraulic drive for large flotation cellsExpiredFeb 05, 93Feb 08, 94[B03D]
5282575 High pressure screen showerExpiredApr 24, 92Feb 01, 94[B05B]
5269928 Clarifier tanksExpiredDec 18, 92Dec 14, 93[B01D]
5252041 Automatic control system for diaphragm pumpsExpiredApr 30, 92Oct 12, 93[F04B]
5246579 Screen device with quick release mountingExpiredJul 15, 92Sep 21, 93[B01D]
5205926 Froth flotation machineExpiredMar 09, 92Apr 27, 93[B03D]
5194146 Cenrifuge filter with closable bypassExpiredJan 13, 92Mar 16, 93[B01D]
5076890 Method for pulp quality control and regulationExpiredFeb 27, 90Dec 31, 91[D21F]
5067982 Corn steeping process and apparatusExpiredNov 03, 89Nov 26, 91[A23L, C08B]
4957565 Process for producing starch from cerealsExpiredOct 09, 87Sep 18, 90[C08B]
4914029 Process for steeping cereals with a new enzyme preparationExpiredSep 12, 88Apr 03, 90[C12P]
4892656 Vacuum filter with releasably clamped sealing stripExpiredFeb 23, 89Jan 09, 90[B01D]
4861495 Press belt device for horizontal filtersExpiredMar 16, 88Aug 29, 89[B01D]
4853115 Rake classifierExpiredJul 20, 88Aug 01, 89[B03B]
4800017 Flotation mechanismExpiredApr 16, 87Jan 24, 89[B01F, C02F]
4759835 Method for discharging cake formed on an electrode structureExpiredAug 30, 85Jul 26, 88[B01D]

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