Patents by Inventor Ravi S. Dixit
Ravi S. Dixit 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: 20100317798Abstract: The invention relates to a polyethylene composition with a bimodal molecular weight distribution and articles made therefrom, such as high topload blow moldings and transmission and distribution pipes. The composition comprises a low-molecular-weight (LMW) ethylene homopolymer component and a homogeneous, high-molecular-weight (HMW) ethylene interpolymer component, wherein the LMW component is characterized as having a molecular weight distribution, MWDL, of less than about 8. The composition is characterized as having a bimodal molecular weight distribution, and a ductile-brittle transition temperature, Tdb, of less than ?20° C. In some embodiments, the HMW component is characterized by a reverse comonomer distribution.Type: ApplicationFiled: August 23, 2010Publication date: December 16, 2010Applicant: Dow Global Technologies Inc.Inventors: Jozef J. VanDun, Peter F.M. van den Berghe, Patrick J. Schouterden, Ruddy Nicasy, Johan Vanvoorden, Frederik E.I. Gemoets, Kalyan Sehanobish, Noorallah Jivraj, Ravi S. Dixit
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Patent number: 7825190Abstract: The invention relates to a polyethylene composition with a bimodal molecular weight distribution and articles made therefrom, such as high topload blow moldings and transmission and distribution pipes. The composition comprises a low-molecular-weight (LMW) ethylene homopolymer component and a homogeneous, high-molecular-weight (HMW) ethylene interpolymer component, wherein the LMW component is characterized as having a molecular weight distribution, MWDL, of less than about 8. The composition is characterized as having a bimodal molecular weight distribution, and a ductile-brittle transition temperature, Tdb, of less than ?20° C. In some embodiments, the HMW component is characterized by a reverse comonomer distribution.Type: GrantFiled: January 11, 2008Date of Patent: November 2, 2010Assignee: Dow Global TechnologiesInventors: Jozef J. Van Dun, Patrick J. C. Schouterden, Kalyan Sehanobish, Peter F. van den Berghen, Noorallah Jivraj, Johan Vanvoorden, Ruddy A. J. Nicasy, Ravi S. Dixit, Frederik E. Gemoets
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Publication number: 20080161497Abstract: The invention relates to a polyethylene composition with a bimodal molecular weight distribution and articles made therefrom, such as high topload blow moldings and transmission and distribution pipes. The composition comprises a low-molecular-weight (LMW) ethylene homopolymer component and a homogeneous, high-molecular-weight (HMW) ethylene interpolymer component, wherein the LMW component is characterized as having a molecular weight distribution, MWDL, of less than about 8. The composition is characterized as having a bimodal molecular weight distribution, and a ductile-brittle transition temperature, Tdb, of less than ?20° C. In some embodiments, the HMW component is characterized by a reverse comonomer distribution.Type: ApplicationFiled: January 11, 2008Publication date: July 3, 2008Applicant: Dow Global Technologies Inc.Inventors: Jozef J. Van Dun, Patrick J. Schouterden, Kalyan Sehanobish, Peter F.M. van den Berghe, Noorallah Jivraj, Johan Vanvoorden, Ruddy Nicasy, Ravi S. Dixit, Frederik E.L. Gemoets
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Patent number: 7345113Abstract: The invention relates to a polyethylene composition with a bimodal molecular weight distribution, methods for making the same, and articles made therefrom, such as high topload blow moldings and transmission and distribution pipes. The composition comprises a low-molecular-weight (LMW) ethylene homopolymer component and a homogeneous, high-molecular-weight (HMW) ethylene interpolymer component, wherein the LMW component is characterized as having a molecular weight distribution, MWDL, of less than about 8. In some embodiments, the HMW component is characterized by a reverse comonomer distribution.Type: GrantFiled: June 30, 2006Date of Patent: March 18, 2008Assignee: Dow Global Technologies Inc.Inventors: Jozef J. Van Dun, Patrick J. C. Schouterden, Kalyan Sehanobish, Peter F. van den Berghen, Noorallah Jivraj, Johan Vanvoorden, Ruddy A. J. Nicasy, Ravi S. Dixit, Frederik E. Gemoets
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Patent number: 7129296Abstract: The invention relates to a polyethylene composition with a bimodal molecular weight distribution and articles made therefrom. The composition comprises a low-molecular-weight (LMW) ethylene homopolymer component and a homogeneous, high-molecular-weight (LMW) ethylene interpolymer component, wherein the LMW component is characterized as having a molecular weight distribution, MWDL, of less than about 8. In some embodiments, the HMW component is characterized by a reverse comonomer distribution.Type: GrantFiled: April 2, 2004Date of Patent: October 31, 2006Assignee: Dow Global Technologies Inc.Inventors: Jozef J. Van Dun, Patrick J. Schouterden, Kalyan Sehanobish, Peter F. M. van den Berghen, Noorallah Jivraj, Ruddy Nicasy, Johan Vanvoorden, Ravi S. Dixit, Frederik E. Gemoets
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Publication number: 20040198911Abstract: The invention relates to a polyethylene composition with a bimodal molecular weight distribution and articles made therefrom. The composition comprises a low-molecular-weight (LMW) ethylene homopolymer component and a homogeneous, high-molecular-weight (HMW) ethylene interpolymer component, wherein the LMW component is characterized as having a molecular weight distribution, MWDL, of less than about 8. In some embodiments, the HMW component is characterized by a reverse comonomer distribution.Type: ApplicationFiled: April 2, 2004Publication date: October 7, 2004Inventors: Jozef J. Van Dun, Patrick J. Schouterden, Kalyan Sehanobish, Peter F. M. van den Berghen, Noorallah Jivraj, Ruddy Nicasy, Johan Vanvoorden, Ravi S. Dixit, Frederik E. Gemoets
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Patent number: 6787608Abstract: The invention relates to a polyethylene composition with a bimodal molecular weight distribution and articles made therefrom, such as high topload blow moldings and transmission and distribution pipes. The composition comprises a low-molecular-weight (LMW) ethylene homopolymer component and a homogeneous, high-molecular-weight (HMW) ethylene interpolymer component, wherein the LMW component is characterized as having a molecular weight distribution, MWDL, of less than about 8. The composition is characterized as having a bimodal molecular weight distribution, and a ductile-brittle transition temperature, Tdb, of less than −20° C. In some embodiments, the HMW component is characterized by a reverse comonomer distribution.Type: GrantFiled: August 16, 2002Date of Patent: September 7, 2004Assignee: Dow Global Technologies, Inc.Inventors: Jozef J. VanDun, Patrick J. Schouterden, Peter F. M. van den Berghe, Ruddy Nicasy, Johan Vanveorden, Frederick E. L. Gemoets, Kalyan Sehanobish, Noorallah Jivraj, Ravi S. Dixit
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Publication number: 20030149180Abstract: The invention relates to a polyethylene composition with a bimodal molecular weight distribution and articles made therefrom, such as high topload blow moldings and transmission and distribution pipes. The composition comprises a low-molecular-weight (LMW) ethylene homopolymer component and a homogeneous, high-molecular-weight (HMW) ethylene interpolymer component, wherein the LMW component is characterized as having a molecular weight distribution, MWDL, of less than about 8. The composition is characterized as having a bimodal molecular weight distribution, and a ductile-brittle transition temperature, Tdb, of less than −20° C. In some embodiments, the HMW component is characterized by a reverse comonomer distribution.Type: ApplicationFiled: August 16, 2002Publication date: August 7, 2003Applicant: Dow Global Technologies Inc.Inventors: Jozef J. Van Dun, Patrick J. Schouterden, Kalyan Sehanobish, Peter F.M. van den Berghe, Noorallah Jivraj, Johan Vanvoorden, Ravi S. Dixit, Ruddy Nicasy, Frederik E.L. Gemoets
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Patent number: 5488020Abstract: A composition comprising a copper(I) impregnated aluminosilicate zeolite wherein the zeolite is selected from faujasites, L and .OMEGA., and wherein the zeolite has a silica to bulk alumina molar ratio between about 12 and about 50 and a silica to framework alumina molar ratio of at least about 15. The catalyst preparation involves in the following order: drying the selected zeolite, impregnating the dried zeolite with a copper(II) salt, calcining the copper(II)-impregnated zeolite, and reducing the copper(II) to copper(I). The composition is useful as a catalyst for the cyclodimerization of 1,3-butadiene to 4-vinylcyclohexene.Type: GrantFiled: February 23, 1994Date of Patent: January 30, 1996Assignee: The Dow Chemical CompanyInventors: Ronald W. Diesen, Kenneth A. Burdett, Ravi S. Dixit, Stanley S. T. King
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Patent number: 5329057Abstract: A process for the cyclodimerization of 1,3-butadienes to 4-vinylcyclohexenes. The process involves contacting butadiene with a copper (I)-aluminosilicate zeolite prepared by (a) an impregnation method, or (b) heating a solid mixture of a copper salt and the zeolite, or (c) contacting vapors of a copper salt with the zeolite. The catalysts exhibit long life and good activity in the claimed process. The impregnated Cu(I)-catalyst is claimed.Type: GrantFiled: September 30, 1992Date of Patent: July 12, 1994Assignee: The Dow Chemical CompanyInventors: Ronald W. Diesen, Kenneth A. Burdett, Ravi S. Dixit, Stanley S. T. King
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Patent number: 5196621Abstract: A process for the cyclodimerization of 1,3-butadienes to 4-vinylcyclohexenes comprising contacting a butadiene in the presence of a promoting amount of a hydroxylic solvent with a catalyst containing copper(I) ions supported on a carrier. A second process for the cyclodimerization of 1,3-butadienes to 4-vinylcyclohexenes comprising contacting a butadiene with a catalytic amount of a copper(I)-impregnated aluminosilicate zeolite characterized by a bulk SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio in the range from about 5 to about 50 and a framework SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of at least about 15. A catalyst composition comprising a copper(I)-impregnated zeolite of specified bulk and framework silica to alumina molar ratios and specified water content. The catalyst exhibits high activity and long lifetime in the aforementioned dimerization processes and is easily regenerated.Type: GrantFiled: April 19, 1991Date of Patent: March 23, 1993Assignee: The Dow Chemical CompanyInventors: Ronald W. Diesen, Kenneth A. Burdett, Ravi S. Dixit, Stanley S. T. King, Michael M. Olken
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Patent number: 5146031Abstract: A process for the production of olefins and diolefins, such as 1,3-butadiene, comprising contacting an aliphatic hydrocarbon, such as butane, with a heterogeneous catalyst composition containing reactive oxygen under reaction conditions such that a more highly unsaturated aliphatic hydrocarbon is selectively formed in a high productivity. The catalyst is a composition comprising (a) a support component of magnesia and alumina and/or magnesium aluminate spinel, and (b) a catalyst component of magnesia, an oxide of molybdenum, a Group IA metal oxide promoter, and optionally vanadium oxide. Catalysts of high surface area and high attrition resistance are claimed.Type: GrantFiled: April 6, 1990Date of Patent: September 8, 1992Assignee: The Dow Chemical CompanyInventors: Bijan Khazai, G. Edwin Vrieland, Craig B. Murchison, Ravi S. Dixit, Edwin D. Weihl