Yoshifumi HISHIKAWA

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Yokohama-shi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Optical transmission path inspecting system, and optical transmissi...
- Patent number 12,111,224
- Issue date Oct 8, 2024
- SUMITOMO ELECTRIC OPTIFRONTIER CO., LTD.
- Gouichi Fukumoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Measurement system
- Patent number 11,965,801
- Issue date Apr 23, 2024
- SUMITOMO ELECTRIC OPTIFRONTIER CO., LTD.
- Kazuya Masuda
- G01 - MEASURING TESTING
Information Patent Grant
Measurement system and measurement method
- Patent number 10,523,317
- Issue date Dec 31, 2019
- Sumitomo Electric Industries, Ltd.
- Kazuya Masuda
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
OPTICAL TRANSMISSION PATH INSPECTING SYSTEM, AND OPTICAL TRANSMISSI...
- Publication number 20220236141
- Publication date Jul 28, 2022
- SUMITOMO ELECTRIC OPTIFRONTIER CO., LTD.
- Gouichi FUKUMOTO
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
MEASUREMENT SYSTEM
- Publication number 20210239569
- Publication date Aug 5, 2021
- SUMITOMO ELECTRIC OPTIFRONTIER CO., LTD.
- Kazuya MASUDA
- G01 - MEASURING TESTING
Information Patent Application
MEASUREMENT SYSTEM AND MEASUREMENT METHOD
- Publication number 20190372665
- Publication date Dec 5, 2019
- Sumitomo Electric Industries, Ltd.
- Kazuya MASUDA
- G01 - MEASURING TESTING