Hiromi Watanabe

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Patents Grantslast 30 patents

Information Patent Grant
Vortex flow type water surface control device for draining device
- Patent number 9,850,649
- Issue date Dec 26, 2017
- Nippon Koei Co., Ltd.
- Hiromi Watanabe
- E03 - WATER SUPPLY SEWERAGE

Patents Applicationslast 30 patents

Information Patent Application
VORTEX FLOW TYPE WATER SURFACE CONTROL DEVICE FOR DRAINING DEVICE
- Publication number 20130240421
- Publication date Sep 19, 2013
- NIPPON KOEI CO., LTD.
- Hiromi Watanabe
- E03 - WATER SUPPLY SEWERAGE