Patents by Inventor Helmut Ringsdorf
Helmut Ringsdorf has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6099750Abstract: Use of compounds in the plastic columnar discotic liquid-crystal phase for transport of electric charges.Type: GrantFiled: November 20, 1998Date of Patent: August 8, 2000Assignee: Siemens AktiengesellschaftInventors: Jurgen Simmerer, Karl-Heinz Etzbach, Karl Siemensmeyer, Wolfgang Paulus, Peter Schuhmacher, Birgit Glusen, Helmut Ringsdorf, Joachim H. Wendorff, Dietrich Haarer, Andreas Kettner
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Patent number: 6036883Abstract: The use of low molecular-weight or polymeric organic compounds which are present in the columnar-helical phase and have liquid-crystalline properties, as photoconductors or in electronic components, corresponding photoconductive layers, an electrophotographic recording material and a method for enhancing the photoconductivity.Type: GrantFiled: May 21, 1998Date of Patent: March 14, 2000Assignee: BASF AktiengesellschaftInventors: Wolfgang Paulus, Lukas Haussling, Karl Siemensmeyer, Karl-Heinz Etzbach, Dieter Adam, Juergen Simmerer, Helmut Ringsdorf, Peter Schuhmacher, Dietrich Haarer, Sundeep Kumar
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Patent number: 5932296Abstract: 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 pair to the surfaces coated with amino groups.Type: GrantFiled: May 7, 1997Date of Patent: August 3, 1999Assignee: Boehringer Mannheim GmbHInventors: Peter Sluka, Dierk Beyer, Helmut Ringsdorf, Wolfgang Knoll
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Patent number: 5798197Abstract: The use of low molecular-weight or polymeric organic compounds which are present in the columnar-helical phase and have liquid-crystalline properties, as photoconductors or in electronic components, corresponding photoconductive layers, an electrophotographic recording material and a method for enhancing the photoconductivity.Type: GrantFiled: February 20, 1997Date of Patent: August 25, 1998Assignee: BASF AktiengesellschaftInventors: Wolfgang Paulus, Lukas Haussling, Karl Siemensmeyer, Karl-Heinz Etzbach, Dieter Adam, Juergen Simmerer, Helmut Ringsdorf, Peter Schuhmacher, Dietrich Haarer, Sundeep Kumar
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Patent number: 5736068Abstract: Novel triphenylene compounds which contain, bonded to the triphenylene framework, at least three ethylenically unsaturated groups or groups carrying oxiranyl or thiiranyl groups, and a process for the preparation of discotic liquid crystalline crosslinked polymers.Type: GrantFiled: May 22, 1996Date of Patent: April 7, 1998Assignee: BASF AktiengesellschaftInventors: Lukas Haeussling, Dirk Funhoff, Karl Siemensmeyer, Karl-Heinz Etzbach, Friedrich Closs, Helmut Ringsdorf, Peter Schuhmacher
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Patent number: 5393626Abstract: The present invention relates to photoconductors composed of low molecular weight or polymeric organic compounds with liquid crystal properties, where the photoconduction in the discotic phase is higher than in the non-liquid-crystal phases, and to a method for increasing the photoconductivity by molecular ordering in photoconductors.Type: GrantFiled: December 16, 1993Date of Patent: February 28, 1995Assignee: BASF AktiengesellschaftInventors: Friedrich Closs, Thomas Frey, Dirk Funhoff, Karl Siemensmeyer, Helmut Ringsdorf, Dietrich Haarer, Peter Strohriegl
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Patent number: 5258262Abstract: Radiation-sensitive film composed of at least one monomolecular layer of fluorine-containing amphiphiles. If a vinyl monomer containing fluoroalkyl side groups is copolymerized with a vinyl monomer containing oxirane groups, an amphiphilic polymer is obtained. To prepare a sandwich, a polymer is dissolved in a volatile organic solvent which is immiscible with water, the solution is spread on the water/air boundary surface, the resultant layer is compressed after the solvent has evaporated and transferred to a solid layer support by the Langmuir-Blodgett technique. The oxirane rings are cleaved and the film crosslinked by the action of high-energy radiation on the film.Type: GrantFiled: September 13, 1991Date of Patent: November 2, 1993Assignee: Hoechst AktiengesellschaftInventors: Christian Erdelen, Helmut Ringsdorf, Werner Prass, Ude Scheunemann
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Patent number: 5034277Abstract: 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 unsaturated amphiphilic compounds, it produces a stable multilayer having good nonlinear optical properties and is suitable, for example, for electrooptical switches, diode laser frequency amplifiers or optical parametric amplifiers.Besides the dye indicated, the unimolecular layer can additionally contain at least one second amphiphilic compound. In this case, the unimolecular layer comprises amphiphilic compounds.Type: GrantFiled: August 20, 1990Date of Patent: July 23, 1991Assignee: Hoechst AktiengesellschaftInventors: Andre Laschewsky, Helmut Ringsdorf, Werner Interthal, Donald Lupo, Werner Prass, Ude Scheunemann
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Patent number: 4980081Abstract: Polymers contain, as mesogenic groups, groups which produce a discotic phase, and furthermore can control pleochroic dyes.The novel polymers possess novel properties, and combination of properties, which the conventional polymers which form liquid-crystalline phases do not possess.The polymers can be used in electro-optical displays, in storage elements, as electrically or photo-electrically conductive polymers and as strain sensors.Type: GrantFiled: April 21, 1989Date of Patent: December 25, 1990Assignee: BASF AktiengesellschaftInventors: Helmut Ringsdorf, Willi Kreuder, Peter Neumann, Karl-Heinz Etzbach, Hans-Josef Sterzel
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Patent number: 4970120Abstract: 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 when the film contains alternating layers of unsaturated amphiphilic compounds, it produces a stable multilayer having good monlinear optical properties and is suitable, for example, for electrooptical switches, diode laser frequency amplifiers or optical parametric amplifiers.Besides the dye indicated, the unimolecular layer can additionally contain at least one second amphiphilic compound. In this case, the unimolecular layer comprises amphiphilic compounds.Type: GrantFiled: July 14, 1988Date of Patent: November 13, 1990Assignee: Hoechst AktiengesellschaftInventors: Andre Laschewsky, Helmut Ringsdorf, Werner Interthal, Donald Lupo, Werner Prass, Ude Sheunemann
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Patent number: 4960635Abstract: The film consists of one or more Langmuir-Blodgett layers, the layer containing an organic polymer having long-chain fluoroalkyl side groups or consisting of this compound. The film is distinguished by a multilayer structure having few defects and is, for example, suitable for optical purposes and for surface treatment. The order of the molecules in the multilayer can be improved by annealing and by heating the film through the phase transition and cooling again.Type: GrantFiled: September 15, 1988Date of Patent: October 2, 1990Assignee: Hoechst AktiengesellschaftInventors: Christian Erdelen, Helmut Ringsdorf, Werner Prass, Ude Scheunemann
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Patent number: 4873033Abstract: 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 surfactants or surfactant-like lipoids containing at least one hydrophobic chain and at least one hydrophilic group, the hydrophobic chains of these molecules being oriented mainly perpendicularly to the plane of the membrane and parallel to the diffusion direction after crosslinking and the molecules of the separation layer being crosslinked with one another through functional groups in at least one of their hydrophobic chains and/or through functional groups in at least one of their hydrophilic groups.Type: GrantFiled: June 22, 1988Date of Patent: October 10, 1989Assignee: Klaus HeckmannInventors: Klaus Heckmann, Georg Manecke, Beate Pfannenmuller, Klaus Ring, Helmut Ringsdorf
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Patent number: 4865762Abstract: Polymers contain, as mesogenic groups, groups which produce a discotic phase, and furthermore can contain pleochroic dyes.The novel polymers possess novel properties, and combinations of properties, which the conventional polymers which form liquid-crystalline phases do not possess.The polymers can be used in electro-optical displays, in storage elements, as electrically or photo-electrically conductive polymers and as strain sensors.Type: GrantFiled: May 12, 1987Date of Patent: September 12, 1989Assignee: BASF AktiengesellschaftInventors: Willi Kreuder, Peter Neumann, Karl-Heinz Etzbach, Hans-Josef Sterzel, Helmut Ringsdorf
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Patent number: 4758342Abstract: 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 surfactants or surfactant-like lipoids containing at least one hydrophobic chain and at least one hydrophilic group, the hydrophobic chains of these molecules being oriented mainly perpendicularly to the plan of the membrane and parallel to the diffusion direction after crosslinking and the molecules of the separation layer being crosslinked with one another through functional groups in at least one of their hydrophobic chains and/or through functional groups in at least one of their hydrophilic groups.Type: GrantFiled: April 9, 1984Date of Patent: July 19, 1988Assignee: Klaus HeckmannInventors: Klaus Heckmann, Georg Manecke, Beate Pfannenmuller, Klaus Ring, Helmut Ringsdorf
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Patent number: 4702945Abstract: An optical recording medium contains, on a base, one or more dyes and a polymer which forms liquid-crystalline phases.The information is written into the uniformly oriented liquid-crystalline polymer layer, for example by means of a laser. During this procedure, the polymer heats up locally to above a phase transition temperature. By cooling, the resulting change is frozen in the glass state.The information can be erased by applying an electric field and/or heating.The recording material permits high-contrast storage and possesses high sensitivity, good resolution and excellent stability.Type: GrantFiled: August 9, 1985Date of Patent: October 27, 1987Assignee: BASF AktiengesellschaftInventors: Karl-Heinz Etzbach, Peter Neumann, Matthias Dust, Helmut Ringsdorf, Hans-Werner Schmidt, Guenter Baur, Friedrich Windscheid, Rudolf Kiefer
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Patent number: 4631328Abstract: The polymer chain comprises(a) one or more monomers possessing a nematogenic, chiral or smectogenic group, or a mixture of monomers possessing a nematogenic group with those possessing a chiral group, and(b) one or more monomers possessing a radical of a pleochroic dye, and the nematogenic, the chiral and the smectogenic groups are bonded to the polymerizable group either directly or, like the dye radicals, via a spacer.The polymers can be used, together with low molecular weight liquid crystals or liquid crystal mixtures, in electrooptical displays.Type: GrantFiled: December 26, 1984Date of Patent: December 23, 1986Assignee: BASF AktiengesellschaftInventors: Helmut Ringsdorf, Michael Portugall, Hans W. Schmidt, Karl H. Etzbach
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Patent number: 4293435Abstract: 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 6 and R.sub.3 represents specific structural elements containing at least two phenylene groups. Preferred is a copolymer comprising a component of the above formula and an additional chiral component of similar structure, prepared by copolymerization of the nematogenic monomer with the chiral monomer.The liquid-crystalline polymer phase permits variation of the wavelength of the reflected light .lambda..sub.R, and its cholesteric structure can be converted to the glassy polymer state and remains preserved in the solid state. Such liquid-crystalline polymer phases can be used in integrated optics, opto-electronics and information storage, e.g. for the manufacture of polarization filters or selective reflectors.Type: GrantFiled: July 19, 1979Date of Patent: October 6, 1981Assignee: BASF AktiengesellschaftInventors: Michael Portugall, Heino Finkelmann, Helmut Ringsdorf
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Patent number: 4182800Abstract: Methotrexate can be reacted with cyclic copolymers of divinyl ether and maleic anhydride to prepare reaction products which are useful in retarding the growth of malignant tumors.Type: GrantFiled: June 28, 1978Date of Patent: January 8, 1980Assignee: Hercules IncorporatedInventors: Helmut Ringsdorf, Michael Przybylski