ZIMPRO PASSAVANT ENVIRONMENTAL SYSTEMS, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5310484 Preaeration treatment of volatile wastewater componentsExpiredAug 24, 92May 10, 94[C02F]
5262060 Wet oxidation of ammonium salt containing liquorsExpiredMar 04, 92Nov 16, 93[C02F]
5234607 Wet oxidation system startup processExpiredApr 22, 92Aug 10, 93[C02F]
5183577 Process for treatment of wastewater containing inorganic ammonium saltsExpiredJan 06, 92Feb 02, 93[C02F]
5089147 Underdrain for granular medium filterExpiredMay 01, 91Feb 18, 92[B01D]
5084163 Automatically controlled splash plateExpiredNov 13, 90Jan 28, 92[B01D]
5075015 Method for color removal from thermally conditioned sludge liquorsExpiredMay 01, 91Dec 24, 91[C02F]
5057231 Method for starting up and controlling operating temperature of a wet oxidation processExpiredNov 08, 90Oct 15, 91[C02F]
5018458 Furnace combustion zone temperature control methodExpiredSep 12, 90May 28, 91[F23G]
5011114 Control valve with displacement-compensating sealExpiredFeb 05, 90Apr 30, 91[F16K]
4983308 Automatic chemical cleaning of granular medium filtersExpiredDec 18, 89Jan 08, 91[B01D]
4976873 Pulsing portions of a filter cell to extend a filter runExpiredDec 14, 89Dec 11, 90[C02F]
4952316 Continuous aeration-batch clarification wastewater treatmentExpiredSep 25, 89Aug 28, 90[C02F]
4857198 Process for treatment of water containing volatile and toxic compoundsExpiredJul 29, 88Aug 15, 89[C02F]
4818414 Slime control for primary filtration systemsExpiredMar 25, 88Apr 04, 89[B01D]
4812243 Process for treating caustic cyanide metal wastesExpiredOct 06, 88Mar 14, 89[C02F]
4780198 Hybrid high rate anaerobic treatment apparatusExpiredJan 29, 87Oct 25, 88[C02F]
4735729 Ash concentration and disposal methodExpiredJun 20, 86Apr 05, 88[C02F]
4693827 Process for protection of biological nitrification systemsExpiredMar 20, 86Sep 15, 87[C02F]
4693831 Rise-rate control of pulsed-bed granular medium filtersExpiredJan 28, 87Sep 15, 87[B01D]

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