Hisaya Ishihara

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Kanagawa, JP

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Patents Grantslast 30 patents

Information Patent Grant
Quadrature modulator
- Patent number 7,346,123
- Issue date Mar 18, 2008
- NEC Electronics Corporation
- Hisaya Ishihara
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Phase shifter with an RC polyphase filter
- Patent number 6,636,085
- Issue date Oct 21, 2003
- NEC Electronics Corporation
- Yukio Okazaki
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Differential amplifier circuit
- Patent number 6,531,920
- Issue date Mar 11, 2003
- NEC Corporation
- Hisaya Ishihara
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Variable gain amplifier circuit
- Patent number 6,177,839
- Issue date Jan 23, 2001
- NEC Corporation
- Hisaya Ishihara
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
High accuracy 90.degree. phase shift circuit error detection
- Patent number 6,054,883
- Issue date Apr 25, 2000
- NEC Corporation
- Hisaya Ishihara
- H03 - BASIC ELECTRONIC CIRCUITRY

Patents Applicationslast 30 patents

Information Patent Application
Phase shifter
- Publication number 20030001648
- Publication date Jan 2, 2003
- NEC Corporation
- Yukio Okazaki
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
Quadrature modulator
- Publication number 20010016017
- Publication date Aug 23, 2001
- Hisaya Ishihara
- H04 - ELECTRIC COMMUNICATION TECHNIQUE