Hirofumi Tsutsumi

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Security system and method of security service business
- Patent number 7,091,870
- Issue date Aug 15, 2006
- Hitachi, Ltd.
- Hirofumi Tsutsumi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Static var compensator with thyristor control
- Patent number 4,891,570
- Issue date Jan 2, 1990
- Hitachi, Ltd.
- Tomoharu Nakamura
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER

Patents Applicationslast 30 patents

Information Patent Application
Apparatus for inspecting the inside of a container and method of in...
- Publication number 20030136902
- Publication date Jul 24, 2003
- Hitachi, Ltd.
- Keiko Nakashige
- G01 - MEASURING TESTING
Information Patent Application
Security system and method of security service business
- Publication number 20030009661
- Publication date Jan 9, 2003
- Hirofumi Tsutsumi
- H01 - BASIC ELECTRIC ELEMENTS