Patents by Inventor Stephan Konrad
Stephan Konrad 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: 8716380Abstract: The invention relates to a polycarbonate composition having reduced subsequent yellowing of the mouldings produced therefrom on heat ageing and having good optical properties of the polycarbonate composition on processing.Type: GrantFiled: September 29, 2010Date of Patent: May 6, 2014Assignee: Bayer MaterialScience AGInventors: Stephan Konrad, Heinrich Hähnsen, Karl-Heinz Köhler, Marc Buts, Daniel Koch, Frank Guldentops
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Patent number: 8648163Abstract: Disclosed are random copoly(phosphonate carbonate)s with the high molecular weight and narrow molecular weight distribution exhibiting a superior combination of properties compared to prior art.Type: GrantFiled: February 11, 2013Date of Patent: February 11, 2014Assignees: FRX Polymers, Inc., Bayer Material Science AGInventors: Dieter Freitag, Pin Go, Lawino Kagumba, Stephan Konrad, Helmut-Werner Heuer, Berit Krauter, Pieter Ooms, Michael Prein, Johann Rechner
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Patent number: 8521309Abstract: A method for operating a system of field devices, wherein the system has at least two field devices, and wherein the field devices especially are measuring devices and/or actuators and/or display devices. A second field device is activated by a first field device, and that, in the case of a successful activation of a field device different from the first field device, the first field device is deactivated.Type: GrantFiled: August 6, 2009Date of Patent: August 27, 2013Assignee: Endress + Hauser Wetzer GmbH + Co. KGInventors: Stephan Konrad, Rainer Pollath
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Patent number: 8507732Abstract: The present invention is directed to a composition comprising a tris-hydroxyaryl compound having a metal ion impurity content of less than 10 ppm and to a process for the purification of tris-hydroxyaryl compound having a metal ion impurity, comprising at least the following steps: a) conditioning a sulphonic acid group-containing active ion exchanger with a solvent which is suitable for the handling of the tris-hydroxyaryl compounds, b) producing a solution of the tris-hydroxyaryl compounds to be purified in a solvent which is suitable for the handling of the tris-hydroxyaryl compounds, c) contacting the tris-hydroxyaryl compound-containing solution from b) with the conditioned ion exchanger from a), d) separating the tris-hydroxyaryl compound-containing solution from c) from the conditioned ion exchanger, e) removing at least part of the solvent from the solution of the tris-hydroxyaryl compound separated in d) under low temperature stress.Type: GrantFiled: April 7, 2011Date of Patent: August 13, 2013Assignee: Bayer Intellectual Property GmbHInventors: Christian Münnich, Stephan Konrad, Karl-Heinz Köhler
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Publication number: 20130187790Abstract: A measurement transmitter having an interface for transmission of measured values via a fieldbus, wherein communication via the fieldbus occurs according to a fieldbus protocol, wherein the number of measured values provided by the measurement transmitter exceeds the number of measured values retrievable by means of a basic command of the fieldbus protocol, wherein the measurement transmitter has a plurality of fieldbus addresses, and wherein a logic unit is provided, which serves so to distribute the measured values among the plurality of fieldbus addresses of the measurement transmitter that the measured values are retrievable via the plurality of fieldbus addresses of the measurement transmitter by means of the basic command.Type: ApplicationFiled: August 25, 2011Publication date: July 25, 2013Inventors: Michael Konrad, Stephan Konrad, Michael Korn
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Patent number: 8487025Abstract: The present invention relates to an aromatic branched polycarbonate, produced via melt transesterification of a bisphenol with a diaryl carbonate in the presence of a branching agent, wherein the aromatic branched polycarbonate comprises branching point structures and structures of formula (D) wherein X is a single bond, C1- to C6-alkylene, C2- to C5-alkylidene or C5- to C6-cycloalkylidene, optionally substituted by C1- to C6-alkyl; wherein the amount of D in the aromatic branched polycarbonate is in the range of from 5 to 450 mg per kg of the aromatic branched polycarbonate; and wherein the ratio of the total branching point structures to the total structures of the formula D in the aromatic branched polycarbonate is in the range of from 8 to 200.Type: GrantFiled: April 7, 2011Date of Patent: July 16, 2013Assignee: Bayer Material Science AGInventors: Stephan Konrad, Helmut-Werner Heuer, Karl-Heinz Köhler, Christian Münnich, Rolf Wehrmann
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Patent number: 8389664Abstract: Disclosed are random copoly(phosphonate carbonate)s with the high molecular weight and narrow molecular weight distribution exhibiting a superior combination of properties compared to prior art.Type: GrantFiled: September 16, 2011Date of Patent: March 5, 2013Assignees: FRX Polymers, Inc., Bayer Material Science AGInventors: Dieter Freitag, Pin Go, Lawino Kagumba, Stephan Konrad, Helmut-Werner Heuer, Berit Krauter, Pieter Ooms, Michael Prein, Johann Rechner
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Publication number: 20120232196Abstract: The invention relates to a UV-stabilised melt polycarbonate composition having improved melt flowability while at the same time having good optical properties and at the same time good hydrolytic stability, the composition comprising a melt polycarbonate, at least one UV absorber, at least one phosphine and optionally an aliphatic carboxylic acid ester.Type: ApplicationFiled: September 17, 2010Publication date: September 13, 2012Applicant: Bayer MaterialScience AGInventors: Stephan Konrad, Helmut Werner Heuer, Karl-Heinz Köhler, Rolf Wehrmann, Daniel Koch, Marc Buts, Frank Guldentops
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Patent number: 8163822Abstract: The invention relates to a polycarbonate composition with improved melt-flowability together with good optical properties and together with good hydrolysis resistance.Type: GrantFiled: September 29, 2010Date of Patent: April 24, 2012Assignee: Bayer MaterialScience AGInventors: Stephan Konrad, Rolf Wehrmann, Helmut-Werner Heuer, Karl-Heinz Köhler, Marc Buts
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Publication number: 20120085151Abstract: The present invention relates to a method for automatically determining the relative solution viscosity and/or the melt volume flow rate of a polymer, during a phase of the process for producing the polymer, where the polymer is in a solution with 10 to 20% by weight of the polymer in an organic solvent. The method includes continuously removing a substream of the polymer solution from a component of the process for producing the polymer, wherein the polymer solution is essentially free from inorganic salts; removing a sample having a volume of from 1 to 10 ?l from the substream; introducing the sample into a gel permeation chromatography apparatus and determining the gel permeation chromatography data for the polymer; and automatically determining the relative solution viscosity and/or the melt volume flow rate of the polymer from the data obtained from the gel permeation chromatogram, on the basis of calibration relationships.Type: ApplicationFiled: October 3, 2011Publication date: April 12, 2012Applicant: Bayer MaterialScience AGInventors: Stephan Konrad, Stefanie Braun, Johann Rechner, Rainer Knopf, Tom Foubert, Franky Bruynseels, Maarten De Bock
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Publication number: 20120068115Abstract: Disclosed are random copoly(phosphonate carbonate)s with the high molecular weight and narrow molecular weight distribution exhibiting a superior combination of properties compared to prior art.Type: ApplicationFiled: September 16, 2011Publication date: March 22, 2012Applicants: BAYER MATERIAL SCIENCE AG, FRX POLYMERS, INC.Inventors: Dieter FREITAG, Pin GO, Lawino KAGUMBA, Stephan KONRAD, Helmut-Werner HEUER, Berit KRAUTER, Pieter OOMS, Michael PREIN, Johann RECHNER
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Publication number: 20110251309Abstract: The present invention relates to an aromatic branched polycarbonate, produced via melt transesterification of a bisphenol with a diaryl carbonate in the presence of a branching agent, wherein the aromatic branched polycarbonate comprises branching point structures and structures of formula (D) wherein X is a single bond, C1- to C6-alkylene, C2- to C5-alkylidene or C5- to C6-cycloalkylidene, optionally substituted by C1- to C6-alkyl; wherein the amount of D in the aromatic branched polycarbonate is in the range of from 5 to 450 mg per kg of the aromatic branched polycarbonate; and wherein the ratio of the total branching point structures to the total structures of the formula D in the aromatic branched polycarbonate is in the range of from 8 to 200.Type: ApplicationFiled: April 7, 2011Publication date: October 13, 2011Applicant: Bayer MaterialScience AGInventors: Stephan Konrad, Helmut-Werner Heuer, Karl-Heinz Köhler, Christian Münnich, Rolf Wehrmann
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Publication number: 20110251438Abstract: The present invention is directed to a composition comprising a tris-hydroxyaryl compound having a metal ion impurity content of less than 10 ppm and to a process for the purification of tris-hydroxyaryl compound having a metal ion impurity, comprising at least the following steps: a) conditioning a sulphonic acid group-containing active ion exchanger with a solvent which is suitable for the handling of the tris-hydroxyaryl compounds, b) producing a solution of the tris-hydroxyaryl compounds to be purified in a solvent which is suitable for the handling of the tris-hydroxyaryl compounds, c) contacting the tris-hydroxyaryl compound-containing solution from b) with the conditioned ion exchanger from a), d) separating the tris-hydroxyaryl compound-containing solution from c) from the conditioned ion exchanger, e) removing at least part of the solvent from the solution of the tris-hydroxyaryl compound separated in d) under low temperature stress.Type: ApplicationFiled: April 7, 2011Publication date: October 13, 2011Applicant: Bayer MaterialScience AGInventors: Christian Münnich, Stephan Konrad, Karl-Heinz Köhler
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Publication number: 20110153037Abstract: A method for operating a system of field devices, wherein the system has at least two field devices, and wherein the field devices especially are measuring devices and/or actuators and/or display devices. A second field device is activated by a first field device, and that, in the case of a successful activation of a field device different from the first field device, the first field device is deactivated.Type: ApplicationFiled: August 6, 2009Publication date: June 23, 2011Applicant: ENDRESS+HAUSER WETZER GMBH+CO. KGInventors: Stephan Konrad, Rainer Pollath
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Publication number: 20110130500Abstract: The invention relates to a polycarbonate composition having reduced subsequent yellowing of the mouldings produced therefrom on heat ageing and having good optical properties of the polycarbonate composition on processing.Type: ApplicationFiled: September 29, 2010Publication date: June 2, 2011Applicant: Bayer MaterialScience AGInventors: Stephan Konrad, Heinrich Hähnsen, Karl-Heinz Köhler, Marc Buts, Daniel Koch, Frank Guldentops
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Publication number: 20110105659Abstract: The invention relates to a polycarbonate composition with improved melt-flowability together with good optical properties and together with good hydrolysis resistance.Type: ApplicationFiled: September 29, 2010Publication date: May 5, 2011Applicant: Bayer MaterialScience AGInventors: Stephan Konrad, Rolf Wehrmann, Helmut-Werner Heuer, Karl-Heinz Köhler, Marc Buts
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Patent number: 7893135Abstract: The present invention relates to compositions comprising A) aromatic polycarbonate, B) polyalkylene terephthalate and C) a concentrate comprising polyalkylene terephthalate and at least one compound selected from the group consisting of ortho-phosphoric acid, phosphorous acid, carboxylic acid esters of ortho-phosphoric acid and carboxylic acid esters of phosphorous acid, Compositions of the present invention are distinguished by high melt stability. The present invention also relates to a process for the preparation of impact-modified polyalkylene terephthalate/polycarbonate compositions, wherein a concentrate of polyalkylene terephthalate with a phosphorus-containing additive is used.Type: GrantFiled: March 20, 2009Date of Patent: February 22, 2011Assignee: Bayer MaterialScience AGInventors: Pierre Moulinie, Ralf Hufen, Stephan Konrad, Dieter Wittmann
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Patent number: 7799889Abstract: The present invention provides a polycarbonate resin produced by the continuous interfacial process characterized in that after alkaline hydrolysis with sodium hydroxide, the polycarbonate resin contains an amount of 0.01 to 150 ppm of carbamate compounds according to formula (1) said amount measured by high pressure liquid chromatography, wherein R1 and R2 independently of one another denote hydrogen or C1-C12-alkyl, or together denote C4-C12-alkylidene, and R3 and R4 independently of one another denote hydrogen. C1-C12-alkyl or phenyl, or together with the carbon atom to which they are bonded form cyclohexyl or trimethylcyclohexyl, the process comprising phosgene reacting with at least one bisphenol at 8 to 17% molar excess of phosgene relative to the bisphenol.Type: GrantFiled: December 20, 2005Date of Patent: September 21, 2010Assignee: Bayer Materialscience AGInventors: Alexander Meyer, Helmut Einberger, Wolfgang Ebert, Michael Prein, Wilfried Haese, Uli Franz, Stephan Konrad
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Publication number: 20100133899Abstract: A two-conductor field device for process automation technology for connecting at least one sensor element includes a first supply part, which via a first 2-conductor connection is connectable with a fieldbus. The field device is supplied completely with energy via the fieldbus. The two-conductor field device includes a second supply part, which is connected to the first supply part and which serves via a second 2-conductor-connection for energy supply of a sensor bus. Further provided are a fieldbus communication unit, which is connected with the first 2-conductor-connection and with the first supply part and which serves for data-exchange via the fieldbus, and a sensor bus communication unit, which is connected with the second 2-conductor-connection and the second supply part and which serves for data exchange via the sensor bus. Connected with the fieldbus communication unit, the sensor bus communication unit and the first supply part is a processing module.Type: ApplicationFiled: November 30, 2007Publication date: June 3, 2010Applicant: Endress + Hauser Wetzer GmbHInventors: Thomas Joegel, Stephan Konrad, Alfred Umkehrer
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Patent number: 7649489Abstract: Apparatus for the analog/digital conversion of a measurement voltage with an analog/digital converter, which has an integrating component with an operational amplifier, a resistor and a capacitor in a feedback loop, wherein a reference voltage is applied to the inverting input of the operational amplifier and wherein the measurement voltage is applied to the non-inverting input of the operational amplifier The capacitor is charged during a charging phase of time length (t1) and discharged during a discharging phase of time length, wherein the analog/digital converter further includes a comparator connected downstream from the operational amplifier, a memory element connected downstream from the comparator, a time generator producing the charging time and a counter, the counter detects the edges, or the period length of the pulse-width modulated output signal provided by the A/D converter on the output, and a synchronizing element is provided, which synchronizes the edges of the pulse-width modulated, output sType: GrantFiled: May 4, 2005Date of Patent: January 19, 2010Assignee: Endress + Hauser Wetzer GmbH + Co. KGInventors: Stephan Konrad, Thomas Härle