Friedhelm Vennmann

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Lingen, DE

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Patents Grantslast 30 patents

Information Patent Grant
Method of lowering electrodes of an electric-arc furnace
- Patent number 4,399,545
- Issue date Aug 16, 1983
- M.A.N. Maschinenfabrik Augsburg-Nurnberg
- Lothar Harmsen
- F27 - FURNACES KILNS OVENS RETORTS
Information Patent Grant
Water cooled wall element formed of tubes for melting furnaces
- Patent number 4,351,055
- Issue date Sep 21, 1982
- Benteler-Werke AG
- Klaus Bick
- F28 - HEAT EXCHANGE IN GENERAL
Information Patent Grant
Water-cooled box designed as wall element for a melting furnace
- Patent number 4,275,258
- Issue date Jun 23, 1981
- Benteler-Werke AG
- Lothar Harmsen
- F27 - FURNACES KILNS OVENS RETORTS