Kyeong-seok Choi

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Ulsan, KR

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Patents Grantslast 30 patents

Information Patent Grant
Method for coating thermionic emission material for a thermionic em...
- Patent number 5,204,139
- Issue date Apr 20, 1993
- Samsung Electron Devices Co., Ltd.
- Kyeong-seok Choi
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
Information Patent Grant
Direct heating cathode structure for cathode ray tubes
- Patent number 5,198,720
- Issue date Mar 30, 1993
- Samsung Electron Devices Co., Ltd.
- Kyeong-seok Choi
- H01 - BASIC ELECTRIC ELEMENTS