Patents by Inventor Munirpallam Appadorai Subramanian
Munirpallam Appadorai Subramanian 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: 20100288967Abstract: The present invention provides an indium-doped Co4Sb12 skutterudite composition in which some Co on the cubic lattice structure may be replaced with one or more members of the group consisting of Fe, Ni, Ru, Rh, Pd, Ir and Pt; some Sb on the planar rings may be replaced by one or more members of the group consisting of Si, Ga, Ge and Sn; and a second dopant atom is selected from a member of the group consisting of Ca, Sc, Zn, Sr, Y, Pd, Ag, Cd, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu. The composition is useful as a thermoelectric material. In preferred embodiments, the composition has a figure of merit greater than 1.0. The present invention also provides a process for the production of the composition, and thermoelectric devices using the composition.Type: ApplicationFiled: May 24, 2010Publication date: November 18, 2010Applicant: E.I. DU PONT DE NEMOURS AND COMPANYInventors: MUNIRPALLAM APPADORAI SUBRAMANIAN, TAO HE, JAMES J. KRAJEWSKI
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Patent number: 7745516Abstract: Water absorption resistant polyimide/epoxy-based compositions, like pastes (or solutions), are particularly useful to make electronic screen-printable materials and electronic components. A group of hydrophobic epoxies (and soluble polyimides) was discovered to be particularly resistant to moisture absorption. The polyimide/epoxy pastes made with these epoxies (and these polyimides) may optionally contain thermal crosslinking agents, adhesion promoting agents, blocked isocyanates, and other inorganic fillers. The polyimide/epoxy pastes of the present invention can have a glass transition temperature greater than 250° C., a water absorption factor of less than 2%, and a positive solubility measurement.Type: GrantFiled: October 12, 2005Date of Patent: June 29, 2010Assignee: E. I. du Pont de Nemours and CompanyInventors: Thomas Eugene Dueber, John D. Summers, Brian C. Auman, Munirpallam Appadorai Subramanian, Nyrissa S. Rogado
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Patent number: 7723607Abstract: The present invention provides an indium-doped Co4Sb12 skutterudite composition in which some Co on the cubic lattice structure may be replaced with one or more members of the group consisting of Fe, Ni, Ru, Rh, Pd, Ir and Pt; some Sb on the planar rings may be replaced by one or more members of the group consisting of Si, Ga, Ge and Sn; and a second dopant atom is selected from a member of the group consisting of Ca, Sc, Zn, Sr, Y, Pd, Ag, Cd, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu. The composition is useful as a thermoelectric material. In preferred embodiments, the composition has a figure of merit greater than 1.0. The present invention also provides a process for the production of the composition, and thermoelectric devices using the composition.Type: GrantFiled: April 14, 2005Date of Patent: May 25, 2010Assignee: E.I. du Pont de Nemours and CompanyInventors: Munirpallam Appadorai Subramanian, Tao He, James J. Krajewski
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Patent number: 7504358Abstract: A crystalline alpha-chromium oxide where from about 0.05 atom % to about 2 atom % of the chromium atoms in the alpha-chromium oxide lattice are substituted by nickel atoms, and optionally, additional chromium atoms in the alpha-chromium oxide lattice are substituted by trivalent cobalt atoms (provided that the total amount of the nickel atoms and the trivalent cobalt atoms in the alpha-chromium oxide lattice is no more than 6 atom %) is disclosed. Also disclosed is a chromium-containing catalyst composition comprising as a chromium-containing component the crystalline substituted alpha-chromium oxide; and a method for preparing a composition comprising the crystalline substituted alpha-chromium oxide.Type: GrantFiled: August 21, 2003Date of Patent: March 17, 2009Assignee: E. I. du Pont de Nemours and CompanyInventors: Velliyur Nott Mallikarjuna Rao, H. David Rosenfeld, Allen C. Sievert, Shekhar Subramoney, Munirpallam Appadorai Subramanian
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Patent number: 7477131Abstract: Provided are compositions containing 20 to 50% by volume of a nitride or carbide of a group IV metal, a polymer, and 1 to 9% by volume of an allotrope of carbon. The compositions are useful in manufacturing resistors with low temperature coefficients of resistivity.Type: GrantFiled: September 7, 2006Date of Patent: January 13, 2009Assignee: E.I. Du Pont De NemoursInventors: Nyrissa S. Rogado, Munirpallam Appadorai Subramanian
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Patent number: 7462217Abstract: The present invention relates to a process for the preparation of thermoelectric compositions of the formula InxCO4Sb12 (0<x<1), with a figure of merit greater than 1.0 and a composition made by that process.Type: GrantFiled: August 4, 2004Date of Patent: December 9, 2008Assignee: E.I. du Pont de Nemours and CompanyInventors: Tao He, James J. Krajewski, Munirpallam Appadorai Subramanian
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Patent number: 7371960Abstract: This invention provides novel thermoelectric compounds comprising: a) atomic percent Ytterbium b) between 50 and 74.999 atomic percent Aluminum c) between 0.001 and 25 atomic percent Manganese and a process for their preparation.Type: GrantFiled: August 4, 2004Date of Patent: May 13, 2008Assignee: E.I. du Pont de Nemours and CompanyInventors: Tao He, James J. Krajewski, Munirpallam Appadorai Subramanian
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Publication number: 20080061273Abstract: Provided are compositions containing 20 to 50% by volume of a nitride or carbide of a group IV metal, a polymer, and 1 to 9% by volume of an allotrope of carbon. The compositions are useful in manufacturing resistors with low temperature coefficients of resistivity.Type: ApplicationFiled: September 7, 2006Publication date: March 13, 2008Inventors: Nyrissa S. Rogado, Munirpallam Appadorai Subramanian
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Patent number: 7314842Abstract: This invention provides the three novel La,Fe, La,Cr and Sm,Fe substituted barium titanate solid solution ferroelectric compositions with the formula Ba1-xLnxTi1-xMxO3 wherein when Ln is La, M is Fe or Cr, when Ln is Sm, M is Fe and x is from about 0.02 to about 0.06 and mixtures thereof, the novel La,Fe substituted barium strontium titanate solid solution ferroelectric compositions with the formula (Ba1-ySry)1-xLaxTi1-xFexO3 wherein y is greater than zero and less than about 0.6 and x is from about 0.01 to about 0.06 and the novel La,Al substituted barium strontium titanate solid solution ferroelectric compositions with the formula (Ba1-ySry)1-xLaxTi1-x/4-3a/4Ala(x-a)/4O3 wherein denotes a vacancy, y is greater than zero and less than about 0.6, a is from about 0.01 to about 0.06 and x is from 0.02 to about 0.10 with the proviso that x is greater than or equal to a.Type: GrantFiled: July 21, 2006Date of Patent: January 1, 2008Assignee: E.I. du Pont de Nemours and CompanyInventors: Dong Li, Munirpallam Appadorai Subramanian
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Patent number: 7217678Abstract: A crystalline alpha-chromium oxide where from about 0.05 atom % to about 6 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by trivalent cobalt (Co+3) atoms is disclosed. Also disclosed is a chromium-containing catalyst composition comprising as a chromium-containing component the crystalline cobalt-substituted alpha-chromium oxide; and a method for preparing a composition comprising the crystalline cobalt-substituted alpha-chromium oxide. The method involves (a) co-precipitating a solid by adding ammonium hydroxide to an aqueous solution of a soluble cobalt salt and a soluble trivalent chromium salt that contains at least three moles of nitrate per mole of chromium in the solution and has a cobalt concentration of from about 0.Type: GrantFiled: August 21, 2003Date of Patent: May 15, 2007Assignee: E. I. du Pont de Nemours and CompanyInventors: Velliyur Nott Mallikarjuna Rao, H. David Rosenfeld, Allen C. Sievert, Shekhar Subramoney, Munirpallam Appadorai Subramanian
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Patent number: 7094721Abstract: This invention provides the three novel La,Fe, La,Cr and Sm,Fe substituted barium titanate solid solution ferroelectric compositions with the formula Ba1?xLnxTi1?xMxO3 wherein when Ln is La, M is Fe or Cr, when Ln is Sm, M is Fe and x is from about 0.02 to about 0.06 and mixtures thereof, the novel La,Fe substituted barium strontium titanate solid solution ferroelectric compositions with the formula (Ba1?ySry)1?xLaxTi1?xFexO3 wherein y is greater than zero and less than about 0.6 and x is from about 0.01 to about 0.06 and the novel La,Al substituted barium strontium titanate solid solution ferroelectric compositions with the formula (Ba1?ySry)1?xLaxTi1?x/4?3a/4Ala}(x?a)/4O3 wherein } denotes a vacancy, y is greater than zero and less than about 0.6, a is from about 0.01 to about 0.06 and x is from 0.02 to about 0.10 with the proviso that x is greater than or equal to a.Type: GrantFiled: March 24, 2005Date of Patent: August 22, 2006Assignee: E. I. du Pont de Nemours and CompanyInventors: Dong Li, Munirpallam Appadorai Subramanian
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Patent number: 6916755Abstract: This invention provides the three novel La,Fe, La,Cr and Sm,Fe substituted barium titanate solid solution ferroelectric compositions with the formula Ba1-xLnxTi1-xMxO3 wherein when Ln is La, M is Fe or Cr, when Ln is Sm, M is Fe and x is from about 0.02 to about 0.06 and mixtures thereof, the novel La,Fe substituted barium strontium titanate solid solution ferroelectric compositions with the formula (Ba1-ySry)1-xLaxTi1-xFex O3 wherein y is greater than zero and less than about 0.6 and x is from about 0.01 to about 0.06 and the novel La,Al substituted barium strontium titanate solid solution ferroelectric compositions with the formula (Ba1-ySry)1-xLax Ti1-x/4 3a/4Ala(x-a)/4O3 wherein denotes a vacancy, y is greater than zero and less than about 0.6, a is from about 0.01 to about 0.06 and x is from 0.02 to about 0.10 with the proviso that x is greater than or equal to a.Type: GrantFiled: May 2, 2001Date of Patent: July 12, 2005Assignee: E. I. du Pont de Nemours and CompanyInventors: Dong Li, Munirpallam Appadorai Subramanian
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Patent number: 6906375Abstract: This invention provides compositions of the formula EuCu3M4O12 wherein M is Ge, Ti, Sn or mixtures thereof. These compositions have high dielectric constant and low loss over a frequency range of from 1 kHz to 1 MHz.Type: GrantFiled: November 18, 2003Date of Patent: June 14, 2005Assignee: E. I. du Pont de Nemours and CompanyInventor: Munirpallam Appadorai Subramanian
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Patent number: 6855670Abstract: Compositions having the nominal formula BiaSrbCacCu3Ox wherein a is from about 1 to 3, b is from about ? to 4, c is from about {fraction (3/16)} to 2, x=(1.5 a+b+c+y) where y is from about 2 to 5, with the proviso that “b+c” is from about {fraction (3/2)} to 5, containing a metal oxide phase of the formula Bi2Sr3?zCazCu2O8+w wherein z is from about 0.1 to 0.9 w is greater than zero but less than 1, are superconducting. Processes for manufacturing such compositions and for using them are disclosed.Type: GrantFiled: May 24, 1990Date of Patent: February 15, 2005Assignee: E. I. du Pont de Nemours and CompanyInventors: Jagannatha Gopalakrishnan, Arthur William Sleight, Munirpallam Appadorai Subramanian
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Publication number: 20040196619Abstract: This invention provides compositions of the formula EuCu3M4O12 wherein M is Ge, Ti, Sn or mixtures thereof. These compositions have high dielectric constant and low loss over a frequency range of from 1 kHz to 1 MHz.Type: ApplicationFiled: November 18, 2003Publication date: October 7, 2004Inventor: Munirpallam Appadorai Subramanian
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Publication number: 20040119054Abstract: This invention provides the three novel La,Fe, La,Cr and Sm,Fe substituted barium titanate solid solution ferroelectric compositions with the formula Ba1−xLnxTi1−xMxO3 wherein when Ln is La, M is Fe or Cr, when Ln is Sm,M is Fe and x is from about 0.02 to about 0.06 and mixtures thereof, the novel La,Fe substituted barium strontium titanate solid solution ferroelectric compositions with the formula (Ba1−ySry)1−xLaxTi1−xFex O3 wherein y is greater than zero and less than about 0.6 and x is from about 0.01 to about 0.06 and the novel La,Al substituted barium strontium titanate solid solution ferroelectric compositions with the formula (Ba1−ySry)1−xLax Ti1−x/4−3a/4Ala(x−a)/4O3 wherein denotes a vacancy, y is greater than zero and less than about 0.6, a is from about 0.01 to about 0.06 and x is from 0.02 to about 0.10 with the proviso that x is greater than or equal to a.Type: ApplicationFiled: October 21, 2002Publication date: June 24, 2004Inventors: Dong Li, Munirpallam Appadorai Subramanian
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Patent number: 5965284Abstract: Scandium-substituted thallium manganese pyrochlore compounds having increased magnetoresistance compared to unsubstituted compounds are disclosed. Such compounds are suitable for use in magnetic read heads and provide the choice of resistivity range.Type: GrantFiled: April 16, 1998Date of Patent: October 12, 1999Assignee: E. I. du Pont de Nemours and CompanyInventor: Munirpallam Appadorai Subramanian
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Patent number: 5853688Abstract: A crystalline lead-containing oxyfluoride of the formula PbMO.sub.2 F wherein M is selected from the group consisting of Ga, Sc, In, Lu, Yb, Tm, Er and Tl.Type: GrantFiled: July 11, 1997Date of Patent: December 29, 1998Assignee: E. I. du Pont de Nemours and CompanyInventor: Munirpallam Appadorai Subramanian