Patents by Inventor Thomas Stehlin
Thomas Stehlin 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: 20080108269Abstract: The present invention relates to a method for the manufacture of sheet molding compounds (SMC) in which the required glass fiber nonwovens are manufactured in-line and have an inhomogeneity of 10% or less, a weight per unit area of 400 g/m2 or higher and a strength of less than 10 N. Furthermore, the present invention describes resin mats that comprise the glass fiber nonwovens in accordance with the invention that represent valuable intermediate products.Type: ApplicationFiled: November 7, 2007Publication date: May 8, 2008Inventors: Sean D'Silva, Thomas Stehlin
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Publication number: 20070187415Abstract: Provided is a glass fiber reinforced cylinder, suitable for use as a high pressure gas cylinder. The reinforced cylinder is prepared by centrifugally creating an inner layer of glass fiber reinforced resin in the cylinder.Type: ApplicationFiled: February 14, 2006Publication date: August 16, 2007Inventors: Sean D'Silva, Thomas Stehlin
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Publication number: 20070049143Abstract: Glass fiber non-woven fabrics, resin impregnated glass mats and methods for their manufacturing. The present invention relates to glass fiber non-woven fabrics comprising cut glass fibers, wherein the glass fiber non-woven fabric has an inhomogeneity of 10% or less, a weight per unit area of 600 g/m2 or greater and a tensile strength of at least 10 N. The present invention also concerns resin impregnated glass mats which comprise the glass fiber non-woven fabrics according to the invention.Type: ApplicationFiled: August 11, 2006Publication date: March 1, 2007Inventors: Sean D'Silva, Thomas Stehlin
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Publication number: 20040038076Abstract: Poly(paraphenylenevinylene) derivatives and their use as electroluminescence materialsType: ApplicationFiled: June 26, 2003Publication date: February 26, 2004Inventors: Willi Kreuder, Donald Lupo, Josef Salbeck, Hermann Schenk, Thomas Stehlin, Hans-Heinrich Horhold, Andrea Lux, Annett Teuschel, Martina Wieduwilt
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Patent number: 6329082Abstract: Hetero-spiro compounds of the formula (I), where &PSgr; is an element of the 4th main group of the Periodic Table with the exception of carbon, preferably Sn, Ge or Si, particularly preferably Ge or Si, and K1 and K2 are, independently of one another, conjugated systems, for use in electroluminescence devices. The compounds of the formula (I) have a good solubility in customary organic solvents, improved film-forming properties and a significantly reduced tendency to crystallize.Type: GrantFiled: May 22, 1997Date of Patent: December 11, 2001Assignee: Hoechst AktiengesellschaftInventors: Willi Kreuder, Donald Lupo, Josef Salbeck, Hermann Schenk, Thomas Stehlin
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Publication number: 20010031378Abstract: Poly(paraphenylenevinylene) derivatives and their use as electroluminescence materialsType: ApplicationFiled: February 28, 2001Publication date: October 18, 2001Inventors: Willi Kreuder, Donald Lupo, Josef Salbeck, Hermann Schenk, Thomas Stehlin, Hans-Heinrich Horhold, Andrea Lux, Annett Teuschel
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Patent number: 5859211Abstract: A conjugated polymer comprising repeating units of the formula (I), ##STR1## where the symbols and indices have the following meanings: .PSI. is an element of the 4th main group of the Periodic Table with the exception of carbon;D, E, F, G are identical or different and are --CR.sup.1 R.sup.2 --, --O--, --S--, --NR.sup.3 -- or a chemical bond;U is --CR.sup.4 .dbd.CR.sup.5 -- or a chemical bond;V is as defined for U or is --CR.sup.1 R.sup.2 --, --O--, --S--, --NR.sup.3 --, --SiR.sup.1 R.sup.2 --, --SO.sub.2 --, --O--, --CO--;A are identical or different and are H, a C.sub.1 --C.sub.20 -hydrocarbon radical which can also contain heteroatoms;T is --O--, --S--, --NR.sup.3 --, --CR.sup.1 R.sup.2 --, --CH.dbd.N--, --CA.dbd.CA--, --CH.dbd.CA--, --CH.dbd.CF-- or --CF.dbd.CF--;K, Q are identical or different hydrocarbon radicals which can contain heteroatoms and have conjugated electron systems;M, L are H or a straight-chain or branched alkyl group having from 1 to 22 carbon atoms, Br, Cl, F, CN, NO.sub.2 or CF.sub.Type: GrantFiled: April 17, 1997Date of Patent: January 12, 1999Assignee: Hoechst AktiengesellschaftInventors: Willi Kreuder, Donald Lupo, Josef Salbeck, Hermann Schenk, Thomas Stehlin
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Patent number: 5856434Abstract: Use in electrooptical switching and display devices of a polymer comprising conjugatively linked chromophore segments whose emission properties are determined by the emission properties of the individual chromophore segments.Electroluminescence devices comprising the polymers of the present invention have, inter alia, a high color purity. The polymers used according to the present invention enable, in particular, blue and white electroluminescence to also be achieved.Type: GrantFiled: February 16, 1996Date of Patent: January 5, 1999Assignee: Hoechst AktiengesellschaftInventors: Roland Stern, Hermann Schenk, Josef Salbeck, Thomas Stehlin, Ullrich Scherf, Klaus Mullen, Gunther Leising
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Patent number: 5840217Abstract: Use of spiro compounds of the formula (I) ##STR1## where K.sup.1 and K.sup.2 are, independently of one another, conjugated systems, in electroluminescence devices.Preferred compounds of the formula (I) are 9,9'-spirobifluorene derivatives of the formula (II) ##STR2## where the benzo groups can be substituted independently of one another. Compounds of the formula (I) have a good solubility in customary organic solvents, improved film-forming properties and a significantly reduced tendency to crystallize. The production of electroluminescence devices is thereby made easier and their service life is increased.Type: GrantFiled: April 5, 1995Date of Patent: November 24, 1998Assignee: Hoechst AktiengesellschaftInventors: Donald Lupo, Josef Salbeck, Hermann Schenk, Thomas Stehlin, Roland Stern, Arno Wolf
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Patent number: 5817727Abstract: The present invention pertains to a film for detecting chemical substances comprising a homopolymer or a copolymer having recurring units represented by the following formula (I): ##STR1## wherein X is --H, --F, --Cl, --Br, --CH.sub.3, --CF.sub.3, --CN or --CH.sub.2 CH.sub.3 ; and R.sup.1 is --R.sup.2 or --Z--R.sup.2 ;wherein Z is --O--, --S--, --NH--, --NR.sup.2' --, --(C.dbd.Y)--, --(C.dbd.Y)--Y--, --Y--(C.dbd.Y)--, --(SO.sub.2)--, --Y'--(SO.sub.2)--, --(SO.sub.2)--Y'--, --Y'--(SO.sub.2)--Y'--, --NH--(C.dbd.O)--, --(C.dbd.O)--NH--, --(C.dbd.O)--NR.sup.2' --, --Y'--(C.dbd.Y)--Y'-- or --O--(C.dbd.O)--(CH.sub.2).sub.n --(C.dbd.O)--O--;wherein Y is independently O or S, and Y' is independently O or NH, and n is an integer of 0 to 20;and wherein R.sup.2 and R.sup.2' represent independently a hydrogen atom, a linear alkyl group, a branched alkyl group, a cycloalkyl group, an unsaturated hydrocarbon group, an aryl group, a saturated or unsaturated hetero ring or derivatives thereof, provided that R.sup.Type: GrantFiled: June 7, 1995Date of Patent: October 6, 1998Assignee: Hoechst AktiengesellschaftInventors: Werner Prass, Thomas Stehlin, Yuan Liu, Shizuo Ogura, Tetsu Yamamoto, Akihiko Tokida, Kenji Motosugi
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Patent number: 5741921Abstract: Conjugated polymers comprising recurring units of the formula (I), ##STR1## where the symbols and indices have the following meanings: .psi. is an element of the 4th main group of the Periodic Table with the exception of carbon;D, E, F, G are identical or different and are each, for example, --O-- or a chemical bond;U is, for example, a chemical bond;V is, for example, as defined for U or is --O--;A are identical or different and are each, for example, H or a C.sub.1 -C.sub.20 -hydrocarbon radical;T is, for example, --O-- or --CA.dbd.CA--, where A is as defined above;K, L, M, Q are identical or different and are hydrocarbon radicals which can contain heteroatoms and have conjugated electron systems;m, n are identical or different and are 0, 1, 2, 3 or 4;are suitable as electroluminescence materials.Type: GrantFiled: April 17, 1997Date of Patent: April 21, 1998Assignee: Hoechst AktiengesellschaftInventors: Willi Kreuder, Donald Lupo, Josef Salbeck, Hermann Schenk, Thomas Stehlin
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Patent number: 5728480Abstract: Poly(4,5,9,10-tetrahydropyrene-2,7-diyl) derivatives of the formula (I) ##STR1## where the symbols R.sup.1 to R.sup.4 have the following meanings: R.sup.1, R.sup.2, R.sup.3, R.sup.4 are identically or variously H, a straight-chain or branched alkyl chain containing 1 to 22 carbon atoms, it being possible for one or more nonadjacent CH.sub.2 groups also to be replaced by --O--, --COO--, --OOC-- and/or phenylene, aryl or aryloxy groups, it being possible for the aromatic to be substituted by C.sub.1 -C.sub.22 -alkyl, C.sub.1 -C.sub.22 -alkoxy, Br, Cl, F, CN, and/or NO.sub.2, Br, Cl, F, CN, NO.sub.2, or carboalkoxy containing 2 to 23 carbon atoms;n is 10 to 150,are suitable as electroluminescence materials.Type: GrantFiled: August 30, 1995Date of Patent: March 17, 1998Assignee: Hoechst AktiengesellschaftInventors: Roland Stern, Donald Lupo, Josef Salbeck, Hermann Schenk, Thomas Stehlin, Klaus Mullen, Martin Kreyenschmidt, Ullrich Scherf
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Patent number: 5712361Abstract: Conjugated polymers containing ansa substructures and their use as electroluminescence materials.Conjugated polymers containing ansa substructures, which contain aromatic groups and in which adjacent aromatic groups are connected to one another in such a way that one ring atom of one aromatic group is directly linked to one ring atom of the other aromatic group and any further linkages of these two aromatic groups are possible only via a bridge containing at least one tetravalent carbon atom and/or heteroatom.The polymers of the invention having ansa substructures are outstandingly suitable as electroluminescence materials, since they have a very high color purity.Type: GrantFiled: June 28, 1995Date of Patent: January 27, 1998Assignee: Hoechst AktiengesellschaftInventors: Roland Stern, Donald Lupo, Josef Salbeck, Hermann Schenk, Thomas Stehlin, Klaus Mullen, Ullrich Scherf, Joachim Huber
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Patent number: 5665844Abstract: The present invention pertains to a film for detecting chemical substances comprising a homopolymer or a copolymer having recurring units represented by the following formula (I): ##STR1## wherein X is --H, --F, --Cl, --Br, --CH.sub.3, --CF.sub.3, --CN or --CH.sub.2 CH.sub.3 ; and R.sup.1 is --R.sup.2 or --Z--R.sup.2 ;wherein Z is --O--, --S--, --NH--, --NR.sup.2' --, --(C.dbd.Y)--, --(C.dbd.Y)--Y--, --Y--(C.dbd.Y)--, --(SO.sub.2)--, --Y'--(SO.sub.2)--, --(SO.sub.2)--Y'--, --Y'--(SO.sub.2)--Y'--, --NH--(C.dbd.O)--, --(C.dbd.O)--NH--, --(C.dbd.O)--NR.sup.2' --, --Y'--(C.dbd.Y)--Y'-- or --O--(C.dbd.O)--(CH.sub.2).sub.n --(C.dbd.O)--O--;wherein Y is independently O or S, and Y' is independently O or NH, and n is an integer of 0 to 20;and wherein R.sup.2 and R.sup.2' represent independently a hydrogen atom, a linear alkyl group, a branched alkyl group, a cycloalkyl group, an unsaturated hydrocarbon group, an aryl group, a saturated or unsaturated hetero ring or derivatives thereof, provided that R.sup.Type: GrantFiled: November 15, 1993Date of Patent: September 9, 1997Assignee: Hoechst AktiengesellschaftInventors: Werner Prass, Thomas Stehlin, Yuan Liu, Shizuo Ogura, Tetsu Yamamoto, Akihiko Tokida, Kenji Motosugi
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Patent number: 5621131Abstract: Conjugated polymers comprising recurring units of the formula (I), ##STR1## A, B, C, D are identical or different and are each from one to fifteen identical or different arylene and/or heteroarylene and/or vinylene groups which, like the spirobifluorene skeleton itself, may be unsubstituted or substituted;S are identical or different substituents;m, n are 0 or 1.The polymers of the invention having the formula (I) are suitable as electroluminescence materials and have, in particular, a high color purity of the emission.Type: GrantFiled: October 12, 1995Date of Patent: April 15, 1997Assignee: Hoechst AktiengesellschaftInventors: Willi Kreuder, Donald Lupo, Josef Salbeck, Hermann Schenk, Thomas Stehlin
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Patent number: 5563707Abstract: An optical sensor for detecting gaseous or liquid chemical species including a sensing element having a flat light reflecting substrate and one or more transparent thin films which are organic or inorganic films or high-polymer films and are formed on the substrate. The detection of the gaseous or liquid chemical species is effected by measuring a change in the light reflection characteristic of the sensing element based on swelling of the thin film or a change in its thickness or refractive index or changes in both parameters.Type: GrantFiled: June 6, 1995Date of Patent: October 8, 1996Assignee: Hoechst AktiengesellschaftInventors: Werner Prass, Thomas Stehlin, Yuan Liu, Shizuo Ogura, Kenji Motosugi, Akihiko Tokida, Tetsu Yamamoto
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Patent number: 5483614Abstract: A transparent molded article for optical applications made from silicon nitride and a coating thereon of oxidic silicon nitride formed by chemical reaction of the silicon nitride with oxygen. The moldings can be shaped, depending on the area of application, to give various articles, for example optical waveguides, prisms, sensor elements or lenses, and are used in all areas where high optical demands are made.Type: GrantFiled: July 21, 1994Date of Patent: January 9, 1996Assignee: Hoechst AktiengesellschaftInventors: Martin Bruck, Tilo Vaahs, Marcellus Peuckert, Ude Scheunemann, Thomas Stehlin, Jurgen Theis
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Patent number: 5358746Abstract: A process for the preparation of optical materials from silicon nitride by pyrolysis of polymeric silazanes, by pressing the pulverulent polymeric silazanes to give moldings before the pyrolysis or first dissolving the polymeric silazanes in an organic solvent, drawing fibers from this solution and pyrolyzing these fibers after evaporation of the solvent, or by melting polymeric silazanes, casting, injection-molding or extruding this melt to give moldings and subsequently pyrolyzing the moldings. An oxidic coating is produced on the silicon nitride molding in an oxygen-containing atmosphere during or after the pyrolysis. The pyrolysis can be carried out at 800.degree.-1000.degree. C. in an atmosphere containing ammonia or an ammonia/inert gas mixture.Type: GrantFiled: September 27, 1993Date of Patent: October 25, 1994Assignee: Hoechst AktiengesellschaftInventors: Martin Bruck, Tilo Vaahs, Marcellus Peuckert, Ude Scheunemann, Thomas Stehlin, Jurgen Theis
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Patent number: 5300162Abstract: In a process for the production of an optical coupler for polymeric optical fibers using ultrasound welding, the fibers are warmed, before the welding, to a temperature of from 50.degree. to 250.degree. C. for from 0.2 to 3 hours. The polymeric optical fibers are introduced into a plastic tube which melts with the fibers during the welding operation to form a unit. In another embodiment, a connector bar which has the same refractive index as the core material of the polymeric optical fibers can be inserted into the plastic tube, the polymeric optical fibers are brought into contact with the connector, and the plastic tube, the connector bar and the fibers are welded to one another under the action of ultrasound.Type: GrantFiled: November 27, 1991Date of Patent: April 5, 1994Assignee: Hoechst AktiengesellschaftInventors: Andreas Brockmeyer, Hans Vowinkel, Werner Groh, Thomas Stehlin, Jurgen Theis
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Patent number: 5281820Abstract: A detector for detecting invisible radiation and charged particles is composed of at least one radiation-absorbing panel and at least one optical waveguide arranged parallel to the surface of said panel and containing a fluorescent dyestuff. The luminescent light produced in the panel by the absorbed radiation is converted into a fluorescent radiation in the optical waveguide conducted to a photosensitive semiconductor component by total reflection and measured at that point.Type: GrantFiled: July 3, 1991Date of Patent: January 25, 1994Assignee: Hoechst AktiengesellschaftInventors: Werner Groh, Jochen Coutandin, Peter Herbrechtsmeier, Jurgen Theis, Thomas Stehlin