Harald Wennemann

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Erkrath, DE

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Patents Grantslast 30 patents

Information Patent Grant
Chromium-free conversion coating treatment of aluminum
- Patent number 5,584,946
- Issue date Dec 17, 1996
- Henkel Kommanditgesellschaft auf Aktien
- Uwe Karmaschek
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
Information Patent Grant
Liquid, phosphate-free single phase degreasing compositions
- Patent number 4,844,744
- Issue date Jul 4, 1989
- Henkel Kommanditgesellschaft auf Aktien
- Herbert Leiter
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
Information Patent Grant
Sealing anodically produced oxide layers, on aluminum
- Patent number 4,445,983
- Issue date May 1, 1984
- Henkel KGaA
- Hans J. Gohausen
- C25 - ELECTROLYTIC OR ELECTROPHORETIC PROCESSES APPARATUS THEREFOR