Patents Represented by Attorney, Agent or Law Firm Barbara C. Siegell
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Patent number: 7470380Abstract: A conductive composition consisting essentially of (a) 50-95 wt % finely divided particles of an electrically-conductive material dispersed in (b) a liquid vehicle, for use in the manufacture of an electrically-conductive pattern on a substrate for the use of reducing cross-sectional area and width while retaining conductivity and resistivity.Type: GrantFiled: March 23, 2004Date of Patent: December 30, 2008Assignee: E.I. Du Pont De Nemours and CompanyInventor: Sarah Jane Mears
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Patent number: 7435361Abstract: The present invention is directed to a thick film conductive composition comprising: (a) electrically conductive silver powder; (b) zinc-containing additive; (c) glass frit wherein said glass frit is lead-free; dispersed in (d) organic medium. The present invention is further directed to an electrode formed from the composition above wherein said composition has been fired to remove the organic vehicle and sinter said glass particles. Still further, the invention is directed to a method of manufacturing a semiconductor device from a structural element composed of a semiconductor having a p-n junction and an insulating film formed on a main surface of the semiconductor comprising the steps of (a) applying onto said insulating film the thick film composition detailed above; and (b) firing said semiconductor, insulating film and thick film composition to form an electrode.Type: GrantFiled: April 14, 2005Date of Patent: October 14, 2008Assignee: E.I. du Pont de Nemours and CompanyInventors: Alan Frederick Carroll, Kenneth Warren Hang
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Patent number: 7233019Abstract: This invention relates to electroluminescent silylated pyrene compounds. It also relates to electronic devices in which the active layer includes an electroluminescent silylated pyrene compound.Type: GrantFiled: April 26, 2004Date of Patent: June 19, 2007Assignee: E. I. du Pont de Nemours and CompanyInventors: Alex Sergey Ionkin, Ying Wang
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Patent number: 6710010Abstract: This invention relates to methods of producing catalysts comprising zirconia and their use in nitrous oxide abatement. The catalysts have relatively high crush strength and relatively low density when compared to those catalysts made by previously known methods.Type: GrantFiled: February 28, 2002Date of Patent: March 23, 2004Assignee: E. I. du Pont de Nemours and CompanyInventor: Paul Douglas VerNooy
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Patent number: 6684019Abstract: An optical signal device which is temperature sensitive and has at least one waveguide layer and at least one material incorporated into the device having a coefficient of thermal expansion of from about 20 to 200 ppm/°K sufficient to impart tensile stress to the waveguide layers as the temperature of the optical signal device changes.Type: GrantFiled: February 22, 2000Date of Patent: January 27, 2004Assignee: E.I. du Pont de Nemours and CompanyInventors: Robert A. Norwood, Louay Eldada, Shing Yin, Cathy Glass, Robert M. Blomquist
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Patent number: 6350895Abstract: This invention relates to an improvement for the preparation of bis(3-hydroxypropyl) dicarboxylate monomers using 1,3-propanediol and a dialkyl dicarboxylate in the presence of a catalytic amount of such yttrium and/or samarium compounds as yttrium/samarium acetylacetonate or tris(2,2,6,6-tetramethyl-3,5-heptanedionato) yttrium/samarium which act as a catalyst for the transesterification reactionType: GrantFiled: February 17, 2000Date of Patent: February 26, 2002Assignee: E. I. Du Pont de Nemours and CompanyInventor: Joseph Varapadavil Kurian
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Patent number: 6335421Abstract: A process of preparing poly(trimethylene terephthalate) containing less than 2.0 mole % of DPG comprising: (a) providing a molar amount of 1,3-propanediol:C1 to C4 dialkyl ester of terephthalic acid of 1.2:1 to 1.9:1, (b) reacting the 1,3-propanediol with the C1 to C4 dialkyl ester of terephthalic, acid to form bis(3-hydroxypropyl)terephthalate monomer in the presence of 10-100 ppm (as titanium metal) of an organic titanate catalyst, by weight of the poly(trimethylene terephthalate), and (c) polymerizing the bis(3-hydroxypropyl)terephthalate monomer to obtain the poly(trimethylene terephthalate); and poly(trimethylene terephthalate) produced by the process.Type: GrantFiled: August 23, 2000Date of Patent: January 1, 2002Assignee: E. I. du Pont de Nemours and CompanyInventors: Joseph Varapadavil Kurian, Yuanfeng Liang
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Patent number: 6331264Abstract: The invention comprises polymer compositions containing 3-hydroxypropanoxy terminated polymer that exhibit reduced levels of degradation product emissions during processing, by contacting the polymer in the molten state with a melt stable, organic nitrogen-containing stabilizing compound, such as polyamide.Type: GrantFiled: February 17, 2000Date of Patent: December 18, 2001Assignee: E. I. Du Pont De Nemours and CompanyInventors: Joseph Varapadavil Kurian, Jing Chung Chang
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Patent number: 6325945Abstract: This invention relates to an improved process for the treatment of aqueous waste stream containing aldehydes and ketones, in particular, alpha, beta-ethylenically unsaturated aldehydes and ketones, which can be rendered non-toxic to biological treatment systems by contacting the waste stream with organic polyamines and/or inorganic ammonium compounds at essentially ambient conditions.Type: GrantFiled: March 21, 2001Date of Patent: December 4, 2001Assignee: E. I. du Pont de Nemours and CompanyInventors: Joseph Varapadavil Kurian, Yuan Feng Liang
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Patent number: 5254718Abstract: This invention concerns esters of unsymmetrically 2-substituted glycolic acid dimers, a process for their preparation and their use in the preparation of unsymmetrically 3,6-substituted 1,4-dioxane-2,5-diones.Type: GrantFiled: February 27, 1991Date of Patent: October 19, 1993Assignee: E. I. Du Pont de Nemours & CompanyInventors: David L. Anton, Charles E. Nakamura
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Patent number: 5243037Abstract: Poly(fluoroalkyl) sugar reagents are prepared containing a sugar such as a monosaccharide or a disaccharide to which are bonded multiple fluoroalkyl anchor groups capable of attaching to a fluorocarbon surface, and either a reactive group capable of covalent coupling to a biomolecule or a charged group to form an ion-exchanger or a non-ionic group to give a neutral fluorosurfactant. A spacer may be between the reactive group and the sugar. The poly(fluoroalkyl) sugar reagents are strongly adsorbed onto fluorocarbon surfaces to provide supports for such applications as separation and immobilization of biomolecules such as enzymes, carrying out heterogeneous diagnostic assays, and preparation of biosensors.Type: GrantFiled: September 21, 1990Date of Patent: September 7, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventors: Rene Arentzen, Prabhakar K. Jadhav, Robert K. Kobos, Bruce E. Smart
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Patent number: 5233004Abstract: Disclosed herein are chromium carbonyl complexes of polyamides containing units derived from aromatic diamines in which about 10 to about 90% of those units are complexed with a chromium carbonyl compound, and a process for making them. When aramids are used, the solubility of the polymer in organic solvents is enhanced, and in the case of certain aramids lyotropic solutions are formed. These solutions can be used to make anisotropic films and fibers.Type: GrantFiled: May 20, 1992Date of Patent: August 3, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventors: Alexa A. Dembek, Andrew E. Feiring
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Patent number: 5233071Abstract: Alpha-fluorinated olefins are hydrosilated using selected cobalt compounds as catalysts. The products are useful in coatings, and as chemical intermediates, elastomers, and caulks.Type: GrantFiled: March 17, 1992Date of Patent: August 3, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventor: Lech Wilczek
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Patent number: 5231154Abstract: An improved process for the polymerization of fluoromonomers to fluoropolymers which comprises using as a chain transfer agent the compound Y(CF.sub.2).sub.m CH.sub.2 CH.sub.2 I, wherein m is 3 to 12, and Y is F or --CH.sub.2 CH.sub.2 I.Type: GrantFiled: September 25, 1992Date of Patent: July 27, 1993Assignee: E. I. DuPont de Nemours and CompanyInventor: Ming-Hong Hung
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Patent number: 5229244Abstract: The present invention concerns a phototackifiable composition useful as a coating on a substrate consisting of an optically clear blend of two or more polymers and a photosensitive compound that forms a strong acid on exposure to actinic radiation. The invention also relates to a process for coating such a composition on a support and toning the image-wise exposed composition on the support.Type: GrantFiled: June 29, 1992Date of Patent: July 20, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventors: Walter R. Hertler, Howard E. Simmons, III
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Patent number: 5229250Abstract: Amphoteric polymers prepared by polymerization of (a) acrylic acid, (b) N,N-dimethyl- or N,N-diethylaminoethyl methacrylate and, optionally, (c) esters of methacrylic or acrylic acid prepared by (i) emulsion polymerization of (b), (c) and the methyl ester of (a), followed by basic hydrolysis, or (ii) polymerization of (a), (b) and (c) in the presence of a strong acid, and photographic emulsions comprised of said polymers in which the molar ratio of (a) to (b) is at least 2 to 1 and a silver halide.Type: GrantFiled: August 16, 1991Date of Patent: July 20, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventor: Robert P. Foss
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Patent number: 5227500Abstract: There are disclosed halogenated dioxolanes of a specified formula, dioxoles made therefrom, polymers of the dioxoles, and processes for making the dioxolanes.Type: GrantFiled: July 17, 1991Date of Patent: July 13, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventor: Carl G. Krespan
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Patent number: 5220082Abstract: This invention concerns a process for the production of polyfluoroolefins by the catalytic addition of polyfluoroallylic fluorides to fluoroethylenes. 1:1 and 1:2 Adducts such as F-pentene-2 and F-heptene-3 can be formed selectively and reduced further to dihydro- or trihydropolyfluoroalkanes, which are useful as HFC cleaning agents.Type: GrantFiled: June 25, 1992Date of Patent: June 15, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventor: Carl G. Krespan
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Patent number: 5219662Abstract: Polyurethane surfaces are made more biocompatible, particularly with blood, by treatment with a block copolymer of a fluorinated oxazoline and either 2-methyl- or 2-ethyl-2-oxazoline. Such polyurethanes are useful as vascular graft or artificial heart parts.Type: GrantFiled: May 23, 1991Date of Patent: June 15, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventors: Lisa C. Grimminger, Sharon L. Haynie, Mureo Kaku, Dotsevi Y. Sogah
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Patent number: 5212257Abstract: Aramid block copolymers which contains blocks which are crystalline and blocks that are noncrystalline after drawing and where polymer chains are flexible in solution and in undrawn polymer, but relatively rigid in drawn polymer, are disclosed. The aramids are tough materials with high modulus and tensile strength. Also disclosed is a process for making such block copolymers. The copolymers are useful as fibers and films, for example in ropes and composites.Type: GrantFiled: December 6, 1991Date of Patent: May 18, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventor: Robert S. Irwin