Thames Water Authority

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4911831 Slow sand filtersExpiredSep 28, 88Mar 27, 90[B01D]
4907911 Pipeline renovation systemExpiredApr 27, 88Mar 13, 90[F16L]
4831887 Automatic sampling machineExpiredJan 14, 87May 23, 89[G01N]
4576719 Process for thickening digested sludgeExpiredFeb 28, 84Mar 18, 86[C02F]
4364141 Sewer cleaning shoe with dam and jet nozzlesExpiredJun 03, 81Dec 21, 82[B08B]

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