U.S. FILTER/ZIMPRO, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4897196 Two-stage batch wastewater treatmentExpiredFeb 17, 88Jan 30, 90[C02F]
4824579 Water clarification method and apparatusExpiredApr 20, 87Apr 25, 89[C02F]
4810386 Two-stage wastewater treatmentExpiredJan 04, 88Mar 07, 89[C02F]
4792407 Oxidation of organic compounds in waterExpiredFeb 18, 88Dec 20, 88[C02F]
4780287 Decomposition of volatile organic halogenated compounds contained in gasesExpiredOct 22, 86Oct 25, 88[B01J]
4778598 Separation of ash from regenerated adsorbentExpiredFeb 02, 87Oct 18, 88[B01D]
4749492 Process for recovering regenerated adsorbent particles and separating ash therefromExpiredJul 06, 87Jun 07, 88[B03D, C02F]
4626354 Method for anaerobic treatment of high strength liquorsExpiredSep 30, 85Dec 02, 86[C12P, C02F]

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