Ueda; Chie

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5277798 Sewage treatment equipment with activated sludge process bedExpiredFeb 01, 93Jan 11, 94[C02F]
5240597 Waste water treatment equipmentExpiredJan 29, 92Aug 31, 93[C02F]
4927530 Apparatus for processing sludgeExpiredApr 28, 88May 22, 90[C02F]
4680111 Sewage treatment equipment with activated sludge process bedsExpiredJul 18, 86Jul 14, 87[C02F]
4678567 Activated sludge process bedExpiredJul 18, 86Jul 07, 87[C02F]

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