Shinryo Air Conditioning Co., Ltd.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4626356 Sludge concentration methodExpiredDec 24, 85Dec 02, 86[C02F]
4500427 Activated-sludge process for wastewater treatmentExpiredNov 05, 82Feb 19, 85[C02F]
4452699 Method of improving the SVI of mixed liquor in aeration tankExpiredApr 28, 82Jun 05, 84[C02F]
4398476 Method for incinerating sewage sludgeExpiredSep 21, 81Aug 16, 83[F23G, C10B]
4370235 Method of treating excess sludgeExpiredSep 15, 80Jan 25, 83[C02F]

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