Helmut Prestel

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Bruchsal, DE

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Patents Grantslast 30 patents

Information Patent Grant
Process for the preparation of benzotriazoles
- Patent number 5,276,161
- Issue date Jan 4, 1994
- Ciba-Geigy Corporation
- Helmut Prestel
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the preparation of alkylhydroxyanilinothiotriazine deri...
- Patent number 5,086,173
- Issue date Feb 4, 1992
- Ciba-Geigy Corporation
- Wolfgang Tritschler
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the preparation of benzotriazole derivatives
- Patent number 4,999,433
- Issue date Mar 12, 1991
- Ciba-Geigy Corporation
- Helmut Prestel
- C07 - ORGANIC CHEMISTRY