Friedrich Kolkmann

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Bruhl, DE

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Patents Grantslast 30 patents

Information Patent Grant
Continuous process for complete removal or organic impurities from...
- Patent number 4,906,445
- Issue date Mar 6, 1990
- Hoechst Aktiengesellschaft
- Gunther Schimmel
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Process for working up dusts which are produced in the electrotherm...
- Patent number 4,904,459
- Issue date Feb 27, 1990
- Hoechst Aktiengesellschaft
- Friedrich Kolkmann
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Process for removing metallic constituents from dust obtained durin...
- Patent number 4,889,702
- Issue date Dec 26, 1989
- Hoechst Aktiengesellschaft
- Friedrich Kolkmann
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Process for making crude phosphoric acid
- Patent number 4,780,294
- Issue date Oct 25, 1988
- Hoechst Aktiengesellschaft
- Gunther Schimmel
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Process for working up heavy metal-containing residues originally f...
- Patent number 4,762,693
- Issue date Aug 9, 1988
- Hoechst Aktiengesellschaft
- Gunther Schimmel
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Grant
Process for making wet-process phosphoric acid
- Patent number 4,683,127
- Issue date Jul 28, 1987
- Hoechst Aktiengesellschaft
- Friedrich Kolkmann
- C01 - INORGANIC CHEMISTRY