Patents by Inventor Stefan Erren
Stefan Erren 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: 11725338Abstract: In a process for producing bleached mechanical woodpulp, said process comprising the steps of a) delaminating comparatively large particles of wood, which have optionally been pretreated with chemicals and/or water, into modified particles of wood, b) grinding the modified particles of wood from a) in one or more refiners, c) optionally treating the stalk obtained in step b) with oxidative or reductive bleaching agents, a composition Z is present during step a) and/or step b), said composition Z comprising one or more of the following components (Z1) to (Z3): a salt of dithionous acid H2S2O4 (Z1), a dithionous acid or dithionous acid derivative generator compound (Z2), a salt of sulfurous acid (sulfite) plus sodium tetraborohydride (Z3) and also optionally additives (Z4).Type: GrantFiled: May 4, 2021Date of Patent: August 15, 2023Assignee: BASF SEInventors: Stefan Erren, Dieter Schönhaber, Martin Schachtl, Pavel Vassilievitch Osipov
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Publication number: 20210254280Abstract: In a process for producing bleached mechanical woodpulp, said process comprising the steps of a) delaminating comparatively large particles of wood, which have optionally been pretreated with chemicals and/or water, into modified particles of wood, b) grinding the modified particles of wood from a) in one or more refiners, c) optionally treating the stalk obtained in step b) with oxidative or reductive bleaching agents, a composition Z is present during step a) and/or step b), said composition Z comprising one or more of the following components (Z1) to (Z3): a salt of dithionous acid H2S2O4(Z1), a dithionous acid or dithionous acid derivative generator compound (Z2), a salt of sulfurous acid (sulfite) plus sodium tetraborohydride (Z3) and also optionally additives (Z4).Type: ApplicationFiled: May 4, 2021Publication date: August 19, 2021Inventors: Stefan ERREN, Dieter SCHÖNHABER, Martin SCHACHTL, Pavel Vassilievitch OSIPOV
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Patent number: 11015290Abstract: In a process for producing bleached mechanical woodpulp, said process comprising the steps of a) delaminating comparatively large particles of wood, which have optionally been pretreated with chemicals and/or water, into modified particles of wood, b) grinding the modified particles of wood from a) in one or more refiners, c) optionally treating the stalk obtained in step b) with oxidative or reductive bleaching agents, a composition Z is present during step a) and/or step b), said composition Z comprising one or more of the following components (Z1) to (Z3): a salt of dithionous acid H2S2O4 (Z1), a dithionous acid or dithionous acid derivative generator compound (Z2), a salt of sulfurous acid (sulfite) plus sodium tetraborohydride (Z3) and also optionally additives (Z4).Type: GrantFiled: March 13, 2015Date of Patent: May 25, 2021Assignee: BASF SEInventors: Stefan Erren, Dieter Schönhaber, Martin Schachtl, Pavel V. Osipov
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Patent number: 11001439Abstract: The present invention relates to a container for holding bulk material, having a closable inlet for the bulk material in the upper closure of the container, a cross-sectional geometry narrowing in the outlet direction for the bulk material, an outlet tube for the bulk material arranged subsequently in the outlet direction, a first reversible mechanical closure device (A), which is arranged in the transition region from the container body to the outlet tube or in the outlet tube itself and, by opening, releases the bulk material from the interior of the container, and a second closure device (B) which reversibly closes the mouth of the outlet tube, the second closure device being a cover which is pressed flush onto the mouth of the outlet tube by means of a closure device, there being a seal which seals the outlet tube in a gas- and liquid-tight fashion from the external environment at least on the contact surface of the cover with the mouth degree of the outlet tube, wherein the cover is screwed onto or is prType: GrantFiled: July 8, 2016Date of Patent: May 11, 2021Assignee: BASF SEInventors: Stefan Erren, Eberhard Beckmann, Reinhard Schneider, Dieter Schönhaber
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Publication number: 20180216292Abstract: In a process for producing bleached mechanical woodpulp, said process comprising the steps of a) delaminating comparatively large particles of wood, which have optionally been pretreated with chemicals and/or water, into modified particles of wood, b) grinding the modified particles of wood from a) in one or more refiners, c) optionally treating the stalk obtained in step b) with oxidative or reductive bleaching agents, a composition Z is present during step a) and/or step b), said composition Z comprising one or more of the following components (Z1) to (Z3): a salt of dithionous acid H2S2O4 (Z1), a dithionous acid or dithionous acid derivative generator compound (Z2), a salt of sulfurous acid (sulfite) plus sodium tetraborohydride (Z3) and also optionally additives (Z4).Type: ApplicationFiled: March 13, 2015Publication date: August 2, 2018Inventors: Stefan ERREN, Dieter SCHÖNHABER, Martin SCHACHTL, Pavel V. OSIPOV
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Publication number: 20180208394Abstract: The present invention relates to a container for holding bulk material, having a closable inlet for the bulk material in the upper closure of the container, a cross-sectional geometry narrowing in the outlet direction for the bulk material, an outlet tube for the bulk material arranged subsequently in the outlet direction, a first reversible mechanical closure device (A), which is arranged in the transition region from the container body to the outlet tube or in the outlet tube itself and, by opening, releases the bulk material from the interior of the container, and a second closure device (B) which reversibly closes the mouth of the outlet tube, the second closure device being a cover which is pressed flush onto the mouth of the outlet tube by means of a closure device, there being a seal which seals the outlet tube in a gas- and liquid-tight fashion from the external environment at least on the contact surface of the cover with the mouth degree of the outlet tube, wherein the cover is screwed onto or is prType: ApplicationFiled: July 8, 2016Publication date: July 26, 2018Inventors: Stefan ERREN, Eberhard BECKMAN, Reinhard SCHNEIDER, Dieter SCHÖNHABER
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Patent number: 9121135Abstract: A method of producing cellulose from lignocellulosic material by sulfite digestion or sulfate digestion in the presence of a salt of dithionous acid comprises using the salt of dithionous acid in an amount from 0.1 to 4.0 wt. % based on the amount of oven-dry lignocellulosic material.Type: GrantFiled: December 12, 2013Date of Patent: September 1, 2015Assignee: BASF SEInventors: Stefan Erren, Dieter Schönhaber, Martin Schachtl
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Patent number: 8784607Abstract: The present invention relates to a process for the production of bleached wood particles and a process for the production of pale to white wood-base materials which are produced from the bleached wood particles.Type: GrantFiled: April 23, 2008Date of Patent: July 22, 2014Assignee: BASF SEInventors: Dieter Schoenhaber, Stefan Erren, Katerina Stieglitz, Eberhard Beckmann, Andres Carlos Garcia Espino, Norbert Jaeger, Juliane Kruesemann
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Publication number: 20140158315Abstract: A method of producing cellulose from lignocellulosic material by sulfite digestion or sulfate digestion in the presence of a salt of dithionous acid comprises using the salt of dithionous acid in an amount from 0.1 to 4.0 wt. % based on the amount of oven-dry lignocellulosic material.Type: ApplicationFiled: December 12, 2013Publication date: June 12, 2014Applicant: BASF SEInventors: Stefan Erren, Dieter Schönhaber, Martin Schachtl
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Publication number: 20100132898Abstract: The present invention relates to a process for the production of bleached wood particles and a process for the production of pale to white wood-base materials which are produced from the bleached wood particles.Type: ApplicationFiled: April 23, 2008Publication date: June 3, 2010Applicant: BASF SEInventors: Dieter Schoenhaber, Stefan Erren, Katerina Stieglitz, Eberhard Beckmann, Andres Carlos Garcia Espino, Norbert Jaeger, Juliane Kruesemann
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Patent number: 5753775Abstract: Sulfonated and oxidized indene polymers obtainable by(a) polymerization of indene or indene derivatives of the general formula I ##STR1## where R.sup.1 is hydrogen, methyl or ethyl and n is 1 or 2, or of mixtures which contain the compounds I as well as other copolymerizable and/or non-polymerizable organic compounds in an amount of at least 10% by weight,b) sulfonation of the polymer with a sulfonating agent at from 40.degree. to 130.degree. C., andc) non-chain-degrading oxidation of the polymer at from 80.degree. to 180.degree. C.These indene polymers are suitable for use as dispersants for example in dye and pigment preparations.Type: GrantFiled: January 31, 1996Date of Patent: May 19, 1998Assignee: BASF AktiengesellschaftInventors: Eberhard Beckmann, Stefan Erren, Ulf Baus, Norbert Zimmermann, Erich Kromm, Klaus Taeger, Eva-Marie Borschel, Willi Bury