Patents by Inventor Dietmar Schaefer
Dietmar Schaefer 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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Publication number: 20240142503Abstract: According to various embodiments, a circuit for determining the frequency of a signal is described, comprising an input configured to receive an analog input signal, an analog to digital converter configured to convert the analog input signal to a digital input signal, a digital mixer configured to generate a mixing result signal by mixing the digital input signal with a single bit binary signal having a reference frequency, a low pass filter configured to generate a filtered signal by filtering the mixing result signal, a measuring circuit configured to measure the period of the filtered signal and an output configured to output a value differing from the frequency of the single bit binary signal by the inverse of the measured period as the frequency to be determined.Type: ApplicationFiled: October 25, 2023Publication date: May 2, 2024Inventors: Wei Wang, Michael Augustin, Jürgen Schäfer, Dietmar König, Josef Niederl, Shane O'Neill
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Patent number: 11732092Abstract: Upcycling process for producing acidic, end-equilibrated siloxanes bearing acetoxy groups and having chain lengths of greater than 3 silicon atoms from end-of-life silicones by thermal digestion in an acidic reaction medium comprising acetic anhydride, acetic acid and at least one further Brønsted acid having a pKa of <4, the digestion taking place in a reactor having a volume of at least 1 liter.Type: GrantFiled: September 15, 2021Date of Patent: August 22, 2023Assignee: Evonik Operations GmbHInventors: Wilfried Knott, Horst Dudzik, Dietmar Schaefer
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Patent number: 11591448Abstract: The method for the physical reutilization of sheet-like siliconized structures comprises treating the sheet-like siliconized structure in a liquid digestion system comprising acetic anhydride and/or an acetoxysiloxane, and at least one Brønsted acid, optionally solvent, preferably with addition of acetic acid, and removing the desiliconized sheet-like structure from the liquid phase.Type: GrantFiled: February 17, 2021Date of Patent: February 28, 2023Assignee: Evonik Operations GmbHInventors: Wilfried Knott, Horst Dudzik, Dietmar Schaefer
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Publication number: 20220119617Abstract: Upcycling process for producing acidic, end-equilibrated siloxanes bearing acetoxy groups and having chain lengths of greater than 3 silicon atoms from end-of-life silicones by thermal digestion in an acidic reaction medium comprising acetic anhydride, acetic acid and at least one further Brønsted acid having a pKa of <4, the digestion taking place in a reactor having a volume of at least 1 liter.Type: ApplicationFiled: September 15, 2021Publication date: April 21, 2022Applicant: Evonik Operations GmbHInventors: Wilfried Knott, Horst Dudzik, Dietmar Schaefer
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Patent number: 11286366Abstract: A process for the recycling of silicones, especially silicone rubber and/or silicone oils, by the chemical transformation thereof to silanes and/or siloxanes having acetoxy groups is described, wherein silicone rubber and/or silicone oils are subjected to a heat treatment in digestion systems comprising acetic anhydride and/or acetoxysiloxane, and at least one Brønsted acid, with addition of acetic acid.Type: GrantFiled: April 15, 2020Date of Patent: March 29, 2022Assignee: Evonik Operations GmbHInventors: Wilfried Knott, Horst Dudzik, Dietmar Schaefer
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Publication number: 20210301099Abstract: The method for the physical reutilization of sheet-like siliconized structures comprises treating the sheet-like siliconized structure in a liquid digestion system comprising acetic anhydride and/or an acetoxysiloxane, and at least one Brøonsted acid, optionally solvent, preferably with addition of acetic acid, and removing the desiliconized sheet-like structure from the liquid phase.Type: ApplicationFiled: February 17, 2021Publication date: September 30, 2021Applicant: Evonik Operations GmbHInventors: Wilfried Knott, Horst Dudzik, Dietmar Schaefer
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Publication number: 20200377686Abstract: A process for the recycling of silicones, especially silicone rubber and/or silicone oils, by the chemical transformation thereof to silanes and/or siloxanes having acetoxy groups is described, wherein silicone rubber and/or silicone oils are subjected to a heat treatment in digestion systems comprising acetic anhydride and/or acetoxysiloxane, and at least one Brønsted acid, with addition of acetic acid.Type: ApplicationFiled: April 15, 2020Publication date: December 3, 2020Applicant: Evonik Operations GmbHInventors: Wilfried Knott, Horst Dudzik, Dietmar Schaefer
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Patent number: 7637534Abstract: A cold gas generator for inflating a gas bag with help of a gas flowing out of a gas pressure vessel (7) with a discharge opening (1) closed off by a destructible membrane (2) arched in a direction opposite relative to the stored gas, with destruction of the membrane (2) occurring by a hot gas jet aimed at the membrane (2), which jet is produced by ignition of a primer (4) which can be activated by application of an electric pulse. In the filled state of gas pressure vessel (7), the surface (6a) of membrane (2) which is averted from the same is directed in an exposed manner into a room (12) which is in connection with the gas bag via at least one discharge opening (11) and through which the hot gas jet is guided which is focused on the membrane (2) via a nozzle chamber (5).Type: GrantFiled: October 9, 2002Date of Patent: December 29, 2009Assignee: ISI Airbag GmbHInventor: Dietmar Schäfer
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Patent number: 6288129Abstract: The present invention provides a process for esterifying or transesterifying acrylic acid and/or methacrylic acid or acrylic esters and/or methacrylic esters with hydroxy-functional and/or polyoxyalkylene-modified siloxane derivatives of the general formula (I) wherein R1 through R8 and v, w, x, y, and z are as defined herein and the esterification or transesterification reaction is catalyzed by an enzyme.Type: GrantFiled: November 1, 1999Date of Patent: September 11, 2001Assignee: Th. Goldschmidt AGInventors: Burghard Gruning, Geoffrey Hills, Wolfgang Josten, Dietmar Schaefer, Stefan Silber, Christian Weitemeyer
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Patent number: 6268521Abstract: The present invention provides a process for enzymatic preparation of acrylic esters and/or methacrylic esters of polyoxyalkylenes, and to the use thereof. The acryloyl and/or methacryloyl compounds of polyoxyalkylenes are obtainable by a process for esterifying or transesterifying acrylic and/or methacrylic acid or acrylic and/or methacrylic esters with a polyoxyalkylene of the general formula (I) wherein R1, R2, R3 and a-e are as defined in claim 1 and wherein at least one OH group is present per molecule and the sequence of the polyoxyalkylene segments (C2H4-aR2aO)b and (CcH2cO)d is arbitrary, in the presence of an enzyme which catalyzes the esterification or transesterification.Type: GrantFiled: November 1, 1999Date of Patent: July 31, 2001Assignee: Goldschmidt AGInventors: Burghard Gruning, Geoffrey Hills, Wolfgang Josten, Dietmar Schaefer, Stefan Silber, Christian Weitemeyer
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Patent number: 5744523Abstract: Polyacrylate esters having an average molecular weight of 1500 to 20,000 and being obtainable by the transesterification of alkyl polyacrylates, obtained by free radical polymerization and containing 1 to 4 carbon atoms in the alkyl group, witha) saturated or unsaturated aliphatic alcohols with 12 to 22 carbon atoms andb) optionally, additionally with dialkylaminoalkanols of the general formula HO--R.sup.1 --NR.sup.2 R.sup.3, wherein R.sup.1 is a divalent alkylene groups with 2 to 4 carbon atoms and are R.sup.2, R.sup.3 are the same or different and represent alkyl groups with 1 to 4 carbon atoms,the molar ratio of the aliphatic alcohols a) to the dialkylaminoalkanols b) being 1:0 to 1:1.5, and the components a) and b) being used in such amounts, that 25 to 70% of the ester groups are transesterified, are used as dispersants for finely divided solids, particularly for fillers and pigments, in organic media.Type: GrantFiled: August 10, 1995Date of Patent: April 28, 1998Assignee: Th. Goldschmidt AGInventors: Michael Barkowsky, Jurgen Fock, Dietmar Schaefer
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Patent number: 5665155Abstract: The invention relates to a coating material comprising polyorganosiloxanes with ester and/or epoxide groups, linked to silicon atoms over carbon atoms, for modifying the surface of finely divided particles, such as pigments and fillers, or of glass fibers.Type: GrantFiled: January 31, 1996Date of Patent: September 9, 1997Assignee: Th. Goldschmidt AG.Inventors: Werner Hohner, Dietmar Schaefer
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Patent number: 5401871Abstract: Organopolysiloxane polyethers with increased resistance to hydrolysis are prepared. Furthermore, a method of rendering an aqueous system hydrolysis-resistant and exhibiting increased wetting property utilizing such polysiloxane polyethers as wetting agents in aqueous systems is described. Aqueous coating systems containing such polyethers exhibit increased wetting property and are resistant to alkaline and acidic hydrolysis.Type: GrantFiled: February 24, 1994Date of Patent: March 28, 1995Assignee: Th. Goldschmidt AGInventors: Georg Feldmann-Krane, Werner Hohner, Dietmar Schaefer, Stefan Silber
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Patent number: 5391679Abstract: Polyether siloxanes, which are linked to the polysiloxane backbone through Si--C bonds, are synthesized by reacting given polysiloxanes with a compound having at least one epoxide group in such amounts, that there are at least two epoxide groups per OH group, in the presence of Lewis acids at temperatures not exceeding 60.degree. C. or in the presence of complex catalysts, which accelerate the addition between epoxide groups and hydroxyl groups, at temperatures up to 140.degree. C., the reaction optionally being carried out in the presence of an inert solvent. The polyether siloxanes obtained have a defined functionality and are free of excess, unreacted polyol components.Type: GrantFiled: May 17, 1993Date of Patent: February 21, 1995Assignee: Th. Goldschmidt AGInventors: Georg Burkhart, Dietmar Schaefer, Andreas Weier, Dietmar Wewers
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Patent number: 5387467Abstract: A method for modifying the surface of finely divided particles, such as pigments and filler or glass fiber, is described. The method utilizes organopolysiloxanes with ester groups and long-chain alkyl groups, which are linked over carbon atoms to silicon atoms.Type: GrantFiled: December 3, 1992Date of Patent: February 7, 1995Assignee: Th. Goldschmidt AGInventors: Werner Hohner, Dietmar Schaefer
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Patent number: 5344949Abstract: Surface active anion-cation complexes are synthesized where an organic or organosilicon compound with at least one epoxide group is reacted with a quaternary ammonium hydrogen sulfite of the general formulaHN.sup.+ (R.sup.1).sub.3 SO.sub.3 H.sup.- IwhereinR.sup.1 within the molecule is the same or different and can be(1) an alkyl or hydroxyalkyl group with 1 to 18 carbon atoms,(2) a phenyl group, or(3) a group of the formula C.sub.n H.sub.2n+1 CONH--(CH.sub.2).sub.m --, in which n can be a number from 7 to 17 and m is 2 or 3,in the presence of a polar solvent in such amounts so that the molar ratio of the epoxide group to HN.sup.+ (R.sup.1).sub.3 SO.sub.3 H.sup.- is 2:1.Type: GrantFiled: July 14, 1993Date of Patent: September 6, 1994Assignee: Th. Goldschmidt AGInventors: Gotz Koerner, Klaus-Dieter Klein, Dietmar Schaefer
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Patent number: 5338485Abstract: Polyacrylate esters with long-chain hydrocarbon and polyoxyalkylene groups are disclosed, which are prepared by transesterification of polyacrylate alkyl esters, the alkyl groups of which have 1 to 4 carbon atoms and which were obtained by free radical polymerization, wherein the transesterification is carried out with a mixture of selected alcohols and polyoxyalkylene monools. Compared to products obtained by copolymerization, the transesterification products are largely free of undesirable low molecular weight components, have a narrow molecular weight distribution and exhibit excellent surfactant properties. They are useful especially as W/O emulsifiers for natural and synthetic oils.Type: GrantFiled: February 27, 1992Date of Patent: August 16, 1994Assignee: The Goldschmidt AGInventors: Jurgen Fock, Eberhard Esselborn, Dietmar Schaefer
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Patent number: 5296573Abstract: Polyacrylate esters with long-chain alkoxylated hydrocarbonoxy groups are disclosed which can be obtained by the transesterification of polyacrylate esters with polyoxyalkylene monools, wherein the polyacrylate esters, up to 50% of which can be replaced by the corresponding methacrylate esters, have been obtained by free radical polymerization and wherein the polyoxyalkylene monools have the average formulaR.sup.1 O(C.sub.n H.sub.2n O--).sub.x HwhereinR.sup.1 is an alkyl, alkenyl or alkylphenyl group,n has an absolute value of 2, 3 or 4 and an average value of 2.0 to 2.5 andx is 10 to 200.The compounds, which can be used as emulsifiers, solubilizers and for thickening aqueous solutions which contain anionic surfactants, particularly in cosmetics and for personal grooming, are distinguished by a content of low molecular weight components, which is smaller compared to that of products obtained by copolymerization.Type: GrantFiled: January 31, 1991Date of Patent: March 22, 1994Assignee: Th. Goldschmidt AGInventors: Eberhard Esselborn, Jurgen Fock, Gotz Koerner, Dietmar Schaefer
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Patent number: 5281478Abstract: A method for modifying the surface of finely divided particles, such as pigments and fillers, or of glass fibers is described. The method utilizes organopolysiloxane with epoxy and long-chain alkyl groups linked over carbon atoms to silicon atoms.Type: GrantFiled: December 3, 1992Date of Patent: January 25, 1994Assignee: Th. Goldschmidt AGInventors: Werner Hohner, Dietmar Schaefer
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Patent number: 5281687Abstract: Polysiloxanes of the general formula ##STR1## which contain at least one sulfatohexyl group linked by an Si--C bond are prepared wherein R.sup.1 is a methyl or phenyl group with the proviso that at least 90% of the R.sup.1 groups are methyl groups, R.sup.2 either is identical with R.sup.1 or is --(CH.sub.2).sub.6 --OSO.sub.3.sup.-.M.sup.+, M.sup.+ being an alkali, 1/2 alkaline earth or optionally an alkyl-substituted ammonium ion, R.sup.3 is identical with R.sup.1 or R.sup.2, with the proviso that at least one R.sup.2 or R.sup.3 group in the average molecule is a --(CH.sub.2).sub.6 --OSO3.sup.-.M.sup.+ group, "a"=0 to 5 and b=0 to 5. A method for the synthesis of these compounds and their use as hydrolysis-resistant surfactants is also described.Type: GrantFiled: December 9, 1992Date of Patent: January 25, 1994Assignee: Th. Goldschmidt AGInventors: Stefan Busch, Peter Lersch, Dietmar Schaefer, Dietmar Wewers