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Heinrich Helker
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Krefeld, DE
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last 30 patents
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Patent Grant
Method for manufacturing alkali chromates from chromium ore
Patent number
5,667,759
Issue date
Sep 16, 1997
Bayer Aktiengesellschaft
Rainer Bellinghausen
C01 - INORGANIC CHEMISTRY
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Patent Grant
Method for manufacturing alkali chromates from chromium ore
Patent number
5,505,918
Issue date
Apr 9, 1996
Bayer Aktiengesellschaft
Uwe Arndt
C01 - INORGANIC CHEMISTRY