E03F 5/12

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9850649 Vortex flow type water surface control device for draining deviceDec 09, 11Dec 26, 17NIPPON KOEI CO., LTD., TOKYO METROPOLITAN GOVERNMENT, TOKYO METROPOLITAN SEWERAGE SERVICE CORPORATION,
9340965 Storm water vault having an articulated floating screen filter systemDec 05, 13May 17, 16Not available
8979432 Vortex flow type water surface control device for draining deviceAug 02, 04Mar 17, 15NIPPON KOEI CO., LTD., TOKYO METROPOLITAN GOVERNMENT, TOKYO METROPOLITAN SEWERAGE SERVICE CORPORATION,
4553561 Device for the prevention of flooding from drainage systemsJun 22, 84Nov 19, 85Not available