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Bernhard Wojtech
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Bad Soden, DE
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last 30 patents
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Patent Grant
Process for the preparation of novolak resins with low metal ion co...
Patent number
5,073,622
Issue date
Dec 17, 1991
Hoechst Aktiengesellschaft
Bernhard Wojtech
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Process for extracting N-methyl-2-pyrrolidone
Patent number
5,068,358
Issue date
Nov 26, 1991
Hoechst Aktiengesellschaft
Georg-Emerich Miess
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Process for the separation of halogenated hydrocarbons from hydroch...
Patent number
4,986,974
Issue date
Jan 22, 1991
Hoechst Aktiengesellschaft
Wilhelm Lendle
C01 - INORGANIC CHEMISTRY
Information
Patent Grant
Process for removing halogenated hydroxyaromatics from aqueous solu...
Patent number
4,864,065
Issue date
Sep 5, 1989
Hoechst Aktiengesellschaft
Bernhard Wojtech
C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
Information
Patent Grant
Process for extracting nitrohydroxyaromatics from aqueous solutions
Patent number
4,814,518
Issue date
Mar 21, 1989
Hoechst Aktiengesellschaft
Helmut Gossel
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Process for the extraction of carboxylic acids from dilute aqueous...
Patent number
4,720,577
Issue date
Jan 19, 1988
Hoechst Aktiengesellschaft
Bernhard Wojtech
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Process for extracting phenols from aqueous solutions
Patent number
4,626,605
Issue date
Dec 2, 1986
Hoechst Aktiengesellschaft
Bernhard Wojtech
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Process for the preparation of glycidyl ethers of monohydric or pol...
Patent number
4,373,073
Issue date
Feb 8, 1983
Hoechst Aktiengesellschaft
Bernhard Wojtech
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Purification of phosphoric acid by means of organic solvents
Patent number
4,196,180
Issue date
Apr 1, 1980
Hoechst Aktiengesellschaft
Bernhard Wojtech
C01 - INORGANIC CHEMISTRY