Koichiro Sumi

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Inagi, JA

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Patents Grantslast 30 patents

Information Patent Grant
Flat thermionic cathode
- Patent number 4,069,436
- Issue date Jan 17, 1978
- Sony Corporation
- Akira Nakayama
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Thermionic cathode and heater structure on ceramic base plate
- Patent number 4,053,807
- Issue date Oct 11, 1977
- Sony Corporation
- Torao Aozuka
- H01 - BASIC ELECTRIC ELEMENTS