Keiko Yamaguchi

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Mobile communication device and reception quality information creat...
- Patent number 7,983,184
- Issue date Jul 19, 2011
- NEC Corporation
- Keiko Yamaguchi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Field effect transistor and fabrication process thereof
- Patent number 6,720,200
- Issue date Apr 13, 2004
- NEC Corporation
- Keiko Yamaguchi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Heterojunction field effect transistor
- Patent number 6,426,523
- Issue date Jul 30, 2002
- NEC Corporation
- Keiko Yamaguchi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Matching circuit and a method for matching a transistor circuit
- Patent number 6,130,589
- Issue date Oct 10, 2000
- NEC Corporation
- Keiko Yamaguchi
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Passive element circuit
- Patent number 6,072,205
- Issue date Jun 6, 2000
- NEC Corporation
- Keiko Yamaguchi
- H01 - BASIC ELECTRIC ELEMENTS

Patents Applicationslast 30 patents

Information Patent Application
CHARGER CONTROL APPARATUS, CHARGER CONTROL METHOD, AND NON-TRANSITO...
- Publication number 20230327470
- Publication date Oct 12, 2023
- NEC Corporation
- Hiromi SUZUKI
- B60 - VEHICLES IN GENERAL
Information Patent Application
Mobile Communication Device and Reception Quality Information Creat...
- Publication number 20090154370
- Publication date Jun 18, 2009
- Keiko Yamaguchi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Field effect transistor and fabrication process thereof
- Publication number 20010024846
- Publication date Sep 27, 2001
- Keiko Yamaguchi
- H01 - BASIC ELECTRIC ELEMENTS