Nishihara Environmental Sanitation Research Corporation Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5567314 Apparatus for biologically treating lipid-containing waste waterExpiredSep 30, 94Oct 22, 96[C02F]
5145589 Solid-liquid separator and process for washing the sameExpiredApr 29, 91Sep 08, 92[B01D]
5098567 Waste water treating processExpiredDec 12, 90Mar 24, 92[C02F]
5006251 Process for treating organic waste waterExpiredSep 27, 89Apr 09, 91[C02F]
4915681 Centrifugal separator with continuous dischargeExpiredFeb 28, 89Apr 10, 90[B04B]
4818408 Intermittent aeration type biological treatment process and system thereforExpiredSep 03, 87Apr 04, 89[C02F]
4661845 Microorganism monitoring apparatusExpiredDec 24, 84Apr 28, 87[H04N]
4655925 Activated sludge methodExpiredJan 18, 85Apr 07, 87[C02F]
4302332 Centrifugal thickenerExpiredJun 25, 80Nov 24, 81[B01D]

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