Kum-Ui Hwang

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Taejeon, KR

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Patents Grantslast 30 patents

Information Patent Grant
Manufacturing method for 4-nitrosoaniline from urea and nitrobenzene
- Patent number 6,198,001
- Issue date Mar 6, 2001
- Korea Kumho Petrochemical Co., Ltd.
- Young J. Joo
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Preparation of 4,4'-dinitrodiphenylamine from urea and nitrobenzene
- Patent number 6,156,932
- Issue date Dec 5, 2000
- Korea Kumho Petrochemical Co., Ltd.
- Young J. Joo
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method for preparing 4-nitrodiphenylamine and 4-nitrosodiphenylamin...
- Patent number 6,137,010
- Issue date Oct 24, 2000
- Korea Kumho Petrochemical Co., Ltd.
- Young J. Joo
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method for preparing 2-methyl-1,4-naphthoquinone (vitamin K.sub.3)
- Patent number 5,770,774
- Issue date Jun 23, 1998
- Korea Kumho Petrochemical Co., Ltd.
- Young J. Joo
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method for preparing anthraquinones
- Patent number 5,723,675
- Issue date Mar 3, 1998
- Korea Kumho Petrochemical Co., Ltd.
- Young J. Joo
- C07 - ORGANIC CHEMISTRY