Patents by Inventor Amiya K. Mukherjee
Amiya K. Mukherjee 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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Patent number: 7481267Abstract: Ceramic materials are converted to materials with anisotropic thermal properties, electrical properties, or both, by forming the ceramics into composites with carbon nanotubes dispersed therein and uniaxially compressing the composites in a direction in which a lower thermal or electrical conductivity is desired.Type: GrantFiled: May 24, 2005Date of Patent: January 27, 2009Assignee: The Regents of the University of CaliforniaInventors: Guodong Zhan, Joshua D. Kuntz, Amiya K. Mukherjee
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Publication number: 20080314568Abstract: Ceramic materials are converted to materials with anisotropic thermal properties, electrical properties, or both, by forming the ceramics into composites with carbon nanotubes dispersed therein and uniaxially compressing the composites in a direction in which a lower thermal or electrical conductivity is desired.Type: ApplicationFiled: May 24, 2005Publication date: December 25, 2008Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, a California corporation.Inventors: Guodong Zhan, Joshua D. Kuntz, Amiya K. Mukherjee
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Patent number: 7217386Abstract: High-density composites of alumina and titania with nano-sized grains are prepared from aluminum titanate without the need to use nano-sized powder as a starting material. The preparation is achieved by high-energy ball milling of the aluminum titanate followed by sintering at elevated temperature and pressure. The aluminum titanate can be prepared from micron-sized alumina and titania particles through plasma jet processing.Type: GrantFiled: August 2, 2004Date of Patent: May 15, 2007Assignee: The Regents of the University of CaliforniaInventors: Julin Wan, Amiya K. Mukherjee
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Patent number: 7148480Abstract: Optical windows for protecting infrared sensing instruments are manufactured from nano-sized crystallites by compressing the crystallites into a continuous mass under high pressure in the presence of a pulsed electric current, preferably one produced by spark plasma sintering. The resulting materials have excellent optical and mechanical properties that make them favorable as replacements for the conventional single-crystal sapphire.Type: GrantFiled: July 14, 2004Date of Patent: December 12, 2006Assignee: The Regents of the University of CaliforniaInventors: Guodong Zhan, Amiya K. Mukherjee, Subhash H. Risbud
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Patent number: 7128850Abstract: Composite materials containing silicon, titanium, carbon, and nitrogen, formed by spark plasma sintering of ceramic starting materials to a high relative density, demonstrate unusually high electrical conductivity as well as high-performance mechanical and chemical properties including hardness, fracture toughness, and corrosion resistance. This combination of electrical, mechanical, and chemical properties makes these composites useful as electrical conductors in applications where high-performance materials are needed due to exposure to extreme conditions such as high temperatures, mechanical stresses, and corrosive environments.Type: GrantFiled: June 2, 2003Date of Patent: October 31, 2006Assignee: The Regents of the University of CaliforniaInventors: Ren-Guan Duan, Joshua D. Kuntz, Amiya K. Mukherjee
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Patent number: 7077991Abstract: Densified composites of silicon nitride, silicon carbide, and boron nitride that exhibit high creep resistance are obtained by sintering a mixture of amorphous powders of silicon nitride, silicon carbide, and boron nitride in the presence of an electric field under high pressure. The grain size in the resulting composite is less than 100 nanometers for all components of the composite, and the composite exhibits high creep resistance.Type: GrantFiled: February 6, 2004Date of Patent: July 18, 2006Assignee: The Regents of the University of CaliforniaInventors: Julin Wan, Amiya K. Mukherjee, Matthew J. Gasch
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Patent number: 7029613Abstract: Densified composites of silicon nitride and silicon carbide that exhibit high creep resistance are obtained by mechanically activating a mixture of amorphous powders of silicon nitride and silicon carbide and sintering the mechanically activated mixture in the presence of an electric field under high pressure. The grain size in the resulting composite is less than 100 nanometers for all components of the composite, and the composite exhibits high creep resistance.Type: GrantFiled: September 8, 2003Date of Patent: April 18, 2006Assignee: The Regents of the University of CaliforniaInventors: Julin Wan, Matthew J. Gasch, Amiya K. Mukherjee
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Patent number: 6976532Abstract: Ceramic materials are converted to materials with anisotropic thermal properties by forming the ceramics into composites with carbon nanotubes dispersed therein and uniaxially compressing the composites in a direction in which a lower thermal conductivity is desired.Type: GrantFiled: June 26, 2003Date of Patent: December 20, 2005Assignee: The Regents of the University of CaliforniaInventors: Guodong Zhan, Joshua D. Kuntz, Amiya K. Mukherjee
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Patent number: 6905649Abstract: A nano-sized powder of barium titanate is compacted and sintered by spark plasma sintering under conditions creating a high heating rate to achieve a densified material that demonstrates superior permittivity.Type: GrantFiled: April 11, 2003Date of Patent: June 14, 2005Assignee: The Regents of the University of CaliforniaInventors: Guodong Zhan, Amiya K. Mukherjee, Joshua D. Kuntz, Julin Wan
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Patent number: 6875374Abstract: Composite materials formed of a matrix of fused ceramic grains with single-wall carbon nanotubes dispersed throughout the matrix and a high relative density, notably that achieved by electric field-assisted sintering, demonstrate unusually high electrical conductivity in combination with high-performance mechanical properties including high fracture toughness. This combination of electrical and mechanical properties makes these composites useful as electrical conductors in applications where high-performance materials are needed due to exposure to extreme conditions such as high temperatures and mechanical stresses.Type: GrantFiled: February 26, 2003Date of Patent: April 5, 2005Assignee: The Regents of the University of CaliforniaInventors: Guodong Zhan, Joshua D. Kuntz, Amiya K. Mukherjee
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Patent number: 6858173Abstract: Composites of ceramic materials, notably alumina or metal oxides in general, with single-wall carbon nanotubes are consolidated by electric field-assisted sintering to achieve a fully dense material that has an unusually high fracture toughness compared to the ceramic alone, and also when compared to composites that contain multi-wall rather than single-wall carbon nanotubes, and when compared to composites that are sintered by methods that do not include exposure to an electric field.Type: GrantFiled: January 30, 2003Date of Patent: February 22, 2005Assignee: The Regents of the University of CaliforniaInventors: Guodong Zhan, Amiya K. Mukherjee, Joshua D. Kuntz, Julin Wan
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Publication number: 20040261978Abstract: Ceramic materials are converted to materials with anisotropic thermal properties by forming the ceramics into composites with carbon nanotubes dispersed therein and uniaxially compressing the composites in a direction in which a lower thermal conductivity is desired.Type: ApplicationFiled: June 26, 2003Publication date: December 30, 2004Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, a California corporationInventors: Guodong Zhan, Joshua D. Kuntz, Amiya K. Mukherjee
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Publication number: 20040238795Abstract: Composite materials containing silicon, titanium, carbon, and nitrogen, formed by spark plasma sintering of ceramic starting materials to a high relative density, demonstrate unusually high electrical conductivity as well as high-performance mechanical and chemical properties including hardness, fracture toughness, and corrosion resistance. This combination of electrical, mechanical, and chemical properties makes these composites useful as electrical conductors in applications where high-performance materials are needed due to exposure to extreme conditions such as high temperatures, mechanical stresses, and corrosive environments.Type: ApplicationFiled: June 2, 2003Publication date: December 2, 2004Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, a California corporationInventors: Ren-Guan Duan, Joshua D. Kuntz, Amiya K. Mukherjee
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Publication number: 20040201137Abstract: A nano-sized powder of barium titanate is compacted and sintered by spark plasma sintering under conditions creating a high heating rate to achieve a densified material that demonstrates superior permittivity.Type: ApplicationFiled: April 11, 2003Publication date: October 14, 2004Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, a California corporationInventors: Guodong Zhan, Amiya K. Mukherjee, Joshua D. Kuntz, Julin Wan
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Publication number: 20040179969Abstract: Densified composites of silicon nitride and silicon carbide that exhibit high creep resistance are obtained by mechanically activating a mixture of amorphous powders of silicon nitride and silicon carbide and sintering the mechanically activated mixture in the presence of an electric field under high pressure. The grain size in the resulting composite is less than 100 nanometers for all components of the composite, and the composite exhibits high creep resistance.Type: ApplicationFiled: September 8, 2003Publication date: September 16, 2004Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, a California corporationInventors: Julin Wan, Matthew J. Gasch, Amiya K. Mukherjee
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Publication number: 20040167009Abstract: High-density composites of ceramic materials, notably alumina or metal oxides in general, are formed by the incorporation of metal particles, of which niobium is a preferred example, and single-wall carbon nanotubes. The composites demonstrate an unusually high fracture toughness compared to the ceramic alone, and also when compared to composites that contain either the metal alone or single-wall carbon nanotubes alone. The two additives thus demonstrate a synergistic effect in improving the toughness of the ceramic.Type: ApplicationFiled: February 26, 2003Publication date: August 26, 2004Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, a California corporationInventors: Joshua D. Kuntz, Guodong Zhan, Amiya K. Mukherjee
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Publication number: 20040150140Abstract: Composites of ceramic materials, notably alumina or metal oxides in general, with single-wall carbon nanotubes are consolidated by electric field-assisted sintering to achieve a fully dense material that has an unusually high fracture toughness compared to the ceramic alone, and also when compared to composites that contain multi-wall rather than single-wall carbon nanotubes, and when compared to composites that are sintered by methods that do not include exposure to an electric field.Type: ApplicationFiled: January 30, 2003Publication date: August 5, 2004Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Guodong Zhan, Amiya K. Mukherjee, Joshua D. Kuntz, Julin Wan
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Patent number: 5728637Abstract: Alumina composites of unusually high hardness and toughness are formed by combining alumina and diamond in nanocrystalline form, followed by sintering at high pressure.Type: GrantFiled: February 1, 1996Date of Patent: March 17, 1998Assignee: The Regents of the University of CaliforniaInventors: Rajiv S. Mishra, Amiya K. Mukherjee, Charles E. Lesher