Hans-Dietrich Obenauf

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Clausthal-Zellerfeld, DE

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Patents Grantslast 30 patents

Information Patent Grant
Method for regulating the electrodes in a furnace having freely bur...
- Patent number 4,701,932
- Issue date Oct 20, 1987
- Fried. KRUPP Gesellschaft mit beschrankter Haftung
- Karlheinz Bretthauer
- C21 - METALLURGY OF IRON
Information Patent Grant
Method and apparatus for regulating arc discharge furnace
- Patent number 4,683,577
- Issue date Jul 28, 1987
- Fried. KRUPP Gesellschaft mit beschrankter Haftung
- Karlheinz Bretthauer
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Method and apparatus for electrically balancing three-phase arc dis...
- Patent number 4,663,764
- Issue date May 5, 1987
- Fried. Krupp Gesellschaft mit beschrankter/Haftung
- Karlheinz Bretthauer
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR