Helmut Keller

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Darmstadt, DE

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Patents Grantslast 30 patents

Information Patent Grant
Permanent process and agent
- Patent number 5,935,562
- Issue date Aug 10, 1999
- Wella AG
- Beate Dannecker
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
2, 5-diaminobenzonitrile compounds and oxidation hair dye compositi...
- Patent number 5,865,856
- Issue date Feb 2, 1999
- Wella Aktiengesellschaft
- Helmut Keller
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Oxidation hair dye with a content of 5-aminophenyl derivatives, pro...
- Patent number 5,409,503
- Issue date Apr 25, 1995
- Wella Aktiengesellschaft
- Thomas Clausen
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE