Envirotech Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
RE33812 Diffuser for aeration basinExpiredAug 07, 90Feb 04, 92[B01F]
D312494 Partition for a waste water treatment containerExpiredSep 22, 86Nov 27, 90[]
4968008 Bioleaching apparatus and systemExpiredSep 26, 88Nov 06, 90[C22B]
4931190 Flocculating agent combinations for mineral slime filtration systemsExpiredDec 27, 88Jun 05, 90[C02F]
PP06403 Chrysanthemum plant named GingerExpiredDec 08, 86Nov 15, 88[A01H]
4736637 Clean boxExpiredMar 09, 87Apr 12, 88[G01N]
4728082 Apparatus for biological processing of metal containing oresExpiredJul 10, 86Mar 01, 88[C22B]
4683761 Clean boxExpiredMay 01, 86Aug 04, 87[G01N]
4624783 Apparatus for granular media filterExpiredJan 22, 85Nov 25, 86[B01D]
4588559 Lime slaking system including a cyclone and classifier for separating calcium hydroxide and grit particles from a slurry thereofExpiredSep 27, 84May 13, 86[C04B]
4575256 Ragless propeller draft tube mixerExpiredSep 19, 83Mar 11, 86[B01F]
4561978 Multiple primary rollExpiredOct 09, 84Dec 31, 85[B01D]
4554963 Method and apparatus for a fluidized bed heat exchangerExpiredAug 19, 83Nov 26, 85[F28C, F28D]
4551285 Flotation machine and aeration impellerExpiredFeb 09, 84Nov 05, 85[B01F]
4541210 Multiple rise coverExpiredJun 23, 83Sep 17, 85[E04B]
4489257 Driving and braking system for electric motorsExpiredOct 14, 83Dec 18, 84[H02P]
4482528 Lime slaking and grit removal process utilized in SO.sub.2 removalExpiredJan 10, 83Nov 13, 84[C01B, C01F]
4475453 Liquid-solid separation utilizing pressure rolls covered with elastomeric layersExpiredJan 26, 82Oct 09, 84[B30B]
4450077 Granular media filterExpiredAug 06, 82May 22, 84[B01D]
4364834 Sedimentation apparatus having an improved skimming mechanismExpiredNov 10, 81Dec 21, 82[B01D]

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