Shohtaroh HARA

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Chiyoda-ku, Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Sintered alloy valve guide and method of producing sintered alloy v...
- Patent number 11,719,138
- Issue date Aug 8, 2023
- TPR CO., LTD.
- Fumiya Ito
- B22 - CASTING POWDER METALLURGY
Information Patent Grant
Sintered alloy valve guide and method of producing sintered alloy v...
- Patent number 11,686,226
- Issue date Jun 27, 2023
- TPR CO., LTD.
- Fumiya Ito
- B22 - CASTING POWDER METALLURGY
Information Patent Grant
Valve seat
- Patent number 10,036,287
- Issue date Jul 31, 2018
- TPR CO., LTD.
- Yoshio Koyama
- C21 - METALLURGY OF IRON
Information Patent Grant
Valve seat
- Patent number 9,581,056
- Issue date Feb 28, 2017
- TPR CO., LTD.
- Yoshio Koyama
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Grant
Valve seat
- Patent number 9,556,761
- Issue date Jan 31, 2017
- TPR CO., LTD.
- Yoshio Koyama
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...

Patents Applicationslast 30 patents

Information Patent Application
SINTERED ALLOY VALVE GUIDE AND METHOD OF PRODUCING SINTERED ALLOY V...
- Publication number 20230127085
- Publication date Apr 27, 2023
- TPR CO., LTD.
- Fumiya Ito
- B22 - CASTING POWDER METALLURGY
Information Patent Application
VALVE SEAT
- Publication number 20160333456
- Publication date Nov 17, 2016
- TPR CO., LTD.
- Yoshio KOYAMA
- C21 - METALLURGY OF IRON
Information Patent Application
VALVE SEAT
- Publication number 20160201527
- Publication date Jul 14, 2016
- TPR CO., LTD.
- Yoshio KOYAMA
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Application
VALVE SEAT
- Publication number 20150047596
- Publication date Feb 19, 2015
- TPR CO., LTD.
- Yoshio Koyama
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES