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Klaus Elfert
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Krefeld, DE
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last 30 patents
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Patent Grant
Semipermeable membranes
Patent number
4,383,923
Issue date
May 17, 1983
Bayer Aktiengesellschaft
Klaus Elfert
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Semipermeable membranes of aromatic disulfimide containing polyamides
Patent number
4,269,967
Issue date
May 26, 1981
Bayer Aktiengesellschaft
Klaus Elfert
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Process of using a semi-permeable membrane of acrylonitrile copolymers
Patent number
4,252,652
Issue date
Feb 24, 1981
Bayer Aktiengesellschaft
Klaus Elfert
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Semipermeable membranes of heterocyclic copolyamides
Patent number
4,221,903
Issue date
Sep 9, 1980
Bayer Aktiengesellschaft
Klaus Elfert
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Semipermeable membranes of copolyamides
Patent number
4,217,227
Issue date
Aug 12, 1980
Bayer Aktiengesellschaft
Klaus Elfert
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Separation of aromatic hydrocarbons from mixtures, using polyuretha...
Patent number
4,115,465
Issue date
Sep 19, 1978
Bayer Aktiengesellschaft
Klaus Elfert
C07 - ORGANIC CHEMISTRY