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Michael Portugall, Heino Finkelmann, Helmut Ringsdorf: Liquid-crystalline polymer phase having a cholesteric structure, processes for its preparation and its use. BASF Aktiengesellschaft, Keil & Witherspoon, October 6, 1981: US04293435 (104 worldwide citation)

A liquid-crystalline polymer phase having an induced cholesteric structure comprises a component having a chiral structure and a component having a nematic structure and contains a polymer with nematogenic units of the formula ##STR1## wherein R.sub.1 is hydrogen or methyl, n is an integer from 1 to ...


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Klaus Heckmann, Georg Manecke, Beate Pfannenmuller, Klaus Ring, Helmut Ringsdorf: Hyperfiltration membranes having separation layers of monomolecular films of surfactants. Klaus Heckmann, Walter H Schneider, July 19, 1988: US04758342 (15 worldwide citation)

The invention relates to a hyperfiltration membrane containing a supporting layer and a separation layer. The membrane is characterized in that the separation layer consists of a crosslinked monomolecular film of molecules, the molecules of the separation layer in the uncrosslinked state being surfa ...


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Willi Kreuder, Peter Neumann, Karl Heinz Etzbach, Hans Josef Sterzel, Helmut Ringsdorf: Polymers which form liquid-crystalline phases. BASF Aktiengesellschaft, Keil & Weinkauf, September 12, 1989: US04865762 (14 worldwide citation)

Polymers contain, as mesogenic groups, groups which produce a discotic phase, and furthermore can contain pleochroic dyes.


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Peter Sluka, Dierk Beyer, Helmut Ringsdorf, Wolfgang Knoll: Process for producing a surface coated with amino groups. Boehringer Mannheim, Nikaido Marmelstein Murray & Oram, August 3, 1999: US05932296 (13 worldwide citation)

A surface coated with amino groups is produced by applying a polymerizable amine to a surface by means of a pulsed plasma. The coated surfaces obtained thereby have a high density of amino groups so that a specific binding phase can be obtained by covalently binding a partner of a specific binding p ...


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Klaus Heckmann, Georg Manecke, Beate Pfannenmuller, Klaus Ring, Helmut Ringsdorf: Process for the production of hyperfiltration membranes. Klaus Heckmann, Walter H Schneider, October 10, 1989: US04873033 (11 worldwide citation)

The invention relates to a hyperfiltration membrane containing a supporting layer and a separation layer. The membrane is characterized in that the separation layer consists of a crosslinked monomolecular film of molecules, the molecules of the separation layer in the uncrosslinked state being surfa ...


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Andre Laschewsky, Helmut Ringsdorf, Werner Interthal, Donald Lupo, Werner Prass, Ude Sheunemann: Film comprising unimolecular layers. Hoechst Aktiengesellschaft, November 13, 1990: US04970120 (10 worldwide citation)

Film comprising at least one unimolecular layer. A film for use in nonlinear optics comprises at least one Langmuir-Blodgett layer, the layer containing or comprising a dye of the formula ##STR1## in which R.sup.1 denotes a long-chain alkoxy, acyloxy, alkylamino or acylamino group. In particular whe ...


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Andre Laschewsky, Helmut Ringsdorf, Werner Interthal, Donald Lupo, Werner Prass, Ude Scheunemann: Film comprising at least one unimolecular layer. Hoechst Aktiengesellschaft, July 23, 1991: US05034277 (8 worldwide citation)

A film for use in nonlinear optics comprises at least one Langmuir-Blodgett layer, the layer containing or comprising a dye of the formula ##STR1## in which R.sup.1 denotes a long-chain alkoxy, acyloxy, alkylamino or acylamino group. In particular when the film contains alternating layers of unsatur ...