Hisanaga Yokoyama

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Kanagawa, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method for supplying inert gas into poppet valve intermediate and a...
- Patent number 9,840,948
- Issue date Dec 12, 2017
- Nittan Valve Co., Ltd.
- Hisanaga Yokoyama
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Engine valve
- Patent number 9,334,977
- Issue date May 10, 2016
- Nittan Valve Co., Ltd.
- Hisanaga Yokoyama
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
Information Patent Grant
Exhaust poppet valve and solution heat treatment method of the same
- Patent number 8,689,761
- Issue date Apr 8, 2014
- Nittan Valve Co., Ltd.
- Yasuhito Tanaka
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...

Patents Applicationslast 30 patents

Information Patent Application
METHOD FOR SUPPLYING INERT GAS INTO POPPET VALVE INTERMEDIATE AND A...
- Publication number 20170276031
- Publication date Sep 28, 2017
- NITTAN VALVE CO., LTD.
- Hisanaga YOKOYAMA
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Application
ENGINE VALVE
- Publication number 20150292640
- Publication date Oct 15, 2015
- NITTAN VALVE CO., LTD.
- Hisanaga Yokoyama
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Application
EXHAUST POPPET VALVE AND SOLUTION HEAT TREATMENT METHOD OF THE SAME
- Publication number 20110126791
- Publication date Jun 2, 2011
- NITTAN VALVE CO., LTD.
- Yasuhito Tanaka
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...