Testuo Oyama

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Takahagi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Directly heated cathode for electron tube
- Patent number 4,220,891
- Issue date Sep 2, 1980
- Hitachi, Ltd.
- Hisashi Ando
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Cathode for cathode ray tube of directly heating type and process f...
- Patent number 4,129,801
- Issue date Dec 12, 1978
- Hitachi, Ltd.
- Ko Soeno
- H01 - BASIC ELECTRIC ELEMENTS