Fujio Yamasita

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Vacuum tube differential preamplifier having a transformer with a c...
- Patent number 6,111,460
- Issue date Aug 29, 2000
- Wako Technical Co., Ltd.
- Fujio Yamasita
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Tube amplifier having special configuration with two or more tubes
- Patent number 5,880,632
- Issue date Mar 9, 1999
- Wako Technical Co., Ltd.
- Fujio Yamasita
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Tube amplifier having specific configuration with four tubes
- Patent number 5,680,074
- Issue date Oct 21, 1997
- Yamasita; Fujio
- Fujio Yamasita
- H03 - BASIC ELECTRONIC CIRCUITRY