Helmut Printzen

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Krefeld, DE

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Patents Grantslast 30 patents

Information Patent Grant
Process for the production of iron oxide yellow pigments
- Patent number 5,185,141
- Issue date Feb 9, 1993
- Bayer Aktiengesellschaft
- Bernd Krockert
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Process for the preparation of iron yellow pigments
- Patent number 5,076,848
- Issue date Dec 31, 1991
- Bayer Aktiengesellschaft
- Bernd Krockert
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Process for the production of iron oxide yellow pigments
- Patent number 5,032,180
- Issue date Jul 16, 1991
- Bayer Aktiengesellschaft
- Bernd Krockert
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Iron oxide yellow pigments having a low silking effect and a proces...
- Patent number 4,698,100
- Issue date Oct 6, 1987
- Bayer Aktiengesellschaft
- Wilfried Burow
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Iron oxide yellow pigments having a low silking effect and a proces...
- Patent number 4,620,879
- Issue date Nov 4, 1986
- Bayer Aktiengesellschaft
- Wilfried Burow
- C01 - INORGANIC CHEMISTRY