Harm Jan Groen

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Oosterhout, NL

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Patents Grantslast 30 patents

Information Patent Grant
Method of preparing a magnetic pigment of .gamma.-Fe.sub.2 O.sub.3...
- Patent number 4,425,409
- Issue date Jan 10, 1984
- U.S. Philips Corporation
- Hendrikus F. Huisman
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Method of preparing a FeOOH pigment
- Patent number 4,349,385
- Issue date Sep 14, 1982
- U.S. Philips Corporation
- Hendrikus F. Huisman
- C01 - INORGANIC CHEMISTRY