Patents by Inventor Sujeet Kumar

Sujeet Kumar 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).

  • Patent number: 6692660
    Abstract: Methods for producing metal/metalloid oxide particles comprise rare earth metals herein include reacting a reactant stream in a gas flow. The reactant stream includes a rare earth metal precursor and an oxygen source. A collection of particles comprising metal/metalloid oxide have an average particle size from about 15 nm to about 1 micron. The metal/metalloid oxide comprises a non-rare earth metal oxide wherein less than about 25 percent of a non-rare earth metal is substituted with a rare earth metal. The particles are useful as phosphors, for example for use in displays.
    Type: Grant
    Filed: April 26, 2001
    Date of Patent: February 17, 2004
    Assignee: NanoGram Corporation
    Inventor: Sujeet Kumar
  • Patent number: 6680041
    Abstract: Manganese oxide particles have been produced having an average diameter less than about 500 nm and a very narrow distribution of particle diameters. Methods are described for producing metal oxides by performing a reaction with an aerosol including a metal precursor. Heat treatments can be performed in an oxidizing environment to alter the properties of the manganese oxide particles.
    Type: Grant
    Filed: October 26, 2000
    Date of Patent: January 20, 2004
    Assignee: NanoGram Corporation
    Inventors: Sujeet Kumar, James T. Gardner, Xiangxin Bi, Nobuyuki Kambe
  • Publication number: 20030228415
    Abstract: Light reactive deposition uses an intense light beam to form particles that are directly coated onto a substrate surface. In some embodiments, a coating apparatus comprising a noncircular reactant inlet, optical elements forming a light path, a first substrate, and a motor connected to the apparatus. The reactant inlet defines a reactant stream path. The light path intersects the reactant stream path at a reaction zone with a product stream path continuing from the reaction zone. The substrate intersects the product stream path. Also, operation of the motor moves the first substrate relative to the product stream. Various broad methods are described for using light driven chemical reactions to produce efficiently highly uniform coatings.
    Type: Application
    Filed: April 15, 2003
    Publication date: December 11, 2003
    Inventors: Xiangxin Bi, Ronald J. Mosso, Shivkumar Chiruvolu, Sujeet Kumar, James T. Gardner, Seung M. Lim, William E. McGovern
  • Publication number: 20030207129
    Abstract: Inorganic particle/polymer composites are described that involve chemical bonding between the elements of the composite. In some embodiments, the composite composition includes a polymer having side groups chemically bonded to inorganic particles. Furthermore, the composite composition can include chemically bonded inorganic particles and ordered copolymers. Various electrical, optical and electro-optical devices can be formed from the composites.
    Type: Application
    Filed: April 24, 2003
    Publication date: November 6, 2003
    Applicant: NanoGram Corporation
    Inventors: Nobuyuki Kambe, Yigal Dov Blum, Benjamin Chaloner-Gill, Shivkumar Chiruvolua, Sujeet Kumar, David Brent MacQueen
  • Publication number: 20030203205
    Abstract: Methods are described that have the capability of producing submicron/nanoscale particles, in some embodiments dispersible, at high production rates. In some embodiments, the methods result in the production of particles with an average diameter less than about 75 nanometers that are produced at a rate of at least about 35 grams per hour. In other embodiments, the particles are highly uniform. These methods can be used to form particle collections and/or powder coatings. Powder coatings and corresponding methods are described based on the deposition of highly uniform submicron/nanoscale particles.
    Type: Application
    Filed: July 15, 2002
    Publication date: October 30, 2003
    Inventors: Xiangxin Bi, Nobuyuki Kambe, Craig R. Horne, James T. Gardner, Ronald J. Mosso, Shivkumar Chiruvolu, Sujeet Kumar, William E. McGovern, Pierre J. DeMascarel, Robert B. Lynch
  • Publication number: 20030198590
    Abstract: A powder of lithiated manganese oxide has an average particle diameter preferably less than about 250 nm. The particles have a high degree of uniformity and preferably a very narrow particle size distribution. The lithiated manganese oxide can be produce by the reaction of an aerosol where the aerosol comprises both a first metal (lithium) precursor and a second metal (manganese) precursor. Preferably, the reaction involves laser pyrolysis where the reaction is driven by heat absorbed from an intense laser beam.
    Type: Application
    Filed: May 13, 2003
    Publication date: October 23, 2003
    Applicant: NanoGram Corporation
    Inventors: Sujeet Kumar, Hariklia Dris Reitz, Xiangxin Bi
  • Patent number: 6607706
    Abstract: A powder of lithiated manganese oxide has an average particle diameter preferably less than about 250 nm. The particles have a high degree of uniformity and preferably a very narrow particle size distribution. The lithiated manganese oxide can be produce by the reaction of an aerosol where the aerosol comprises both a first metal (lithium) precursor and a second metal (manganese) precursor. Preferably, the reaction involves laser pyrolysis where the reaction is driven by heat absorbed from an intense laser beam.
    Type: Grant
    Filed: November 9, 1998
    Date of Patent: August 19, 2003
    Assignee: NanoGram Corporation
    Inventors: Sujeet Kumar, Hariklia Dris Reitz, Xiangxin Bi
  • Patent number: 6599631
    Abstract: Inorganic particle/polymer composites are described that involve chemical bonding between the elements of the composite. In some embodiments, the composite composition includes a polymer having side groups chemically bonded to inorganic particles. Furthermore, the composite composition can include chemically bonded inorganic particles and ordered copolymers. Various electrical, optical and electro-optical devices can be formed from the composites.
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: July 29, 2003
    Assignee: NanoGram Corporation
    Inventors: Nobuyuki Kambe, Yigal Do Blum, Benjamin Chaloner-Gill, Shivkumar Chiruvolu, Sujeet Kumar, David Brent MacQueen
  • Publication number: 20030127316
    Abstract: An aerosol delivery apparatus is used to deliver an aerosol into a reaction chamber for chemical reaction to produce reaction products such as nanoparticles. A variety of improved aerosol delivery approaches provide for the production of more uniform reaction products. In preferred embodiments, a reaction chamber is used that has a cross section perpendicular to the flow of reactant having a dimension along a major axis greater than a dimension along a minor axis. The aerosol preferably is elongated along the major axis of the reaction chamber.
    Type: Application
    Filed: January 17, 2003
    Publication date: July 10, 2003
    Applicant: NanoGram Corporation
    Inventors: James T. Gardner, Sujeet Kumar, Ronald M. Cornell, Ronald J. Mosso, Xiangxin Bi
  • Publication number: 20030117691
    Abstract: Three dimensional optical structures are described that can have various integrations between optical devices within and between layers of the optical structure. Optical turning elements can provide optical pathways between layers of optical devices. Methods are described that provide for great versatility on contouring optical materials throughout the optical structure. Various new optical devices are enabled by the improved optical processing approaches.
    Type: Application
    Filed: December 21, 2001
    Publication date: June 26, 2003
    Inventors: Xiangxin Bi, Elizabeth Anne Nevis, Ronald J. Mosso, Michael Edward Chapin, Shivkumar Chiruvolu, Sardar Hyat Khan, Sujeet Kumar, Herman Adrian Lopez, Nguyen Tran The Huy, Craig Richard Horne, Michael A. Bryan, Eric Euvrard
  • Publication number: 20030118841
    Abstract: Nanoscale particles, particle coatings/particle arrays and corresponding consolidated materials are described based on an ability to vary the composition involving a wide range of metal and/or metalloid elements and corresponding compositions. In particular, metalloid oxides and metal-metalloid compositions are described in the form of improved nanoscale particles and coatings formed from the nanoscale particles. Compositions comprising rare earth metals and dopants/additives with rare earth metals are described. Complex compositions with a range of host compositions and dopants/additives can be formed using the approaches described herein. The particle coating can take the form of particle arrays that range from collections of disbursable primary particles to fused networks of primary particles forming channels that reflect the nanoscale of the primary particles. Suitable materials for optical applications are described along with some optical devices of interest.
    Type: Application
    Filed: March 15, 2002
    Publication date: June 26, 2003
    Inventors: Craig R. Horne, Peirre J. DeMascarel, Christian C. Honeker, Benjamin Chaloner-Gill, Herman A. Lopez, Xiangxin Bi, Ronald J. Mosso, William E. McGovern, James T. Gardner, Sujeet Kumar, James A. Gilliam, Vince Pham, Eric Euvrard, Shivkumar Chiruvolu, Jesse Jur
  • Publication number: 20030044346
    Abstract: Collections of particles comprising multiple a metal oxide can be formed with average particle sizes less than about 500 nm. In some embodiments, the particle collections have particle size distributions such that at least about 95 percent of the particles have a diameter greater than about 40 percent of the average diameter and less than about 160 percent of the average diameter. Also, in further embodiments, the particle collections have particle size distribution such that effectively no particles have a diameter greater than about four times the average diameter of the collection of particles.
    Type: Application
    Filed: October 16, 2002
    Publication date: March 6, 2003
    Applicant: NanoGram Corporation
    Inventors: Sujeet Kumar, Hariklia Dris Reitz, Craig R. Horne, James T. Gardner, Ronald J. Mosso, Xiangxin Bi
  • Patent number: 6508855
    Abstract: An aerosol delivery apparatus is used to deliver an aerosol into a reaction chamber for chemical reaction to produce reaction products such as nanoparticles. A variety of improved aerosol delivery approaches provide for the production of more uniform reaction products. In preferred embodiments, a reaction chamber is used that has a cross section perpendicular to the flow of reactant having a dimension along a major axis greater than a dimension along a minor axis. The aerosol preferably is elongated along the major axis of the reaction chamber.
    Type: Grant
    Filed: January 3, 2001
    Date of Patent: January 21, 2003
    Assignee: NanoGram Corporation
    Inventors: James T. Gardner, Sujeet Kumar, Ronald M. Cornell, Ronald J. Mosso, Xiangxin Bi
  • Patent number: 6506493
    Abstract: Manganese oxide particles have been produced having an average diameter less than about 500 nm and a very narrow distribution of particle diameters. Methods are described for producing metal oxides by performing a reaction with an aerosol including a metal precursor. Heat treatments can be performed in an oxidizing environment to alter the properties of the manganese oxide particles.
    Type: Grant
    Filed: November 9, 1998
    Date of Patent: January 14, 2003
    Assignee: NanoGram Corporation
    Inventors: Sujeet Kumar, James T. Gardner, Xiangxin Bi, Nobuyuki Kambe
  • Publication number: 20020192476
    Abstract: Inorganic particle/polymer composites are described that involve chemical bonding between the elements of the composite. In some embodiments, the composite composition includes a polymer having side groups chemically bonded to inorganic particles. Furthermore, the composite composition can include chemically bonded inorganic particles and ordered copolymers. Various electrical, optical and electro-optical devices can be formed from the composites.
    Type: Application
    Filed: March 27, 2001
    Publication date: December 19, 2002
    Inventors: Nobuyuki Kambe, Yigal Do Blum, Benjamin Chaloner-Gill, Shivkumar Chiruvolu, Sujeet Kumar, David Brent MacQueen
  • Publication number: 20020179886
    Abstract: Methods for producing metal/metalloid oxide particles comprise rare earth metals herein include reacting a reactant stream in a gas flow. The reactant stream includes a rare earth metal precursor and an oxygen source. A collection of particles comprising metal/metalloid oxide have an average particle size from about 15 nm to about 1 micron. The metal/metalloid oxide comprises a non-rare earth metal oxide wherein less than about 25 percent of a non-rare earth metal is substituted with a rare earth metal. The particles are useful as phosphors, for example for use in displays.
    Type: Application
    Filed: April 26, 2001
    Publication date: December 5, 2002
    Inventor: Sujeet Kumar
  • Patent number: 6482374
    Abstract: Lithium manganese oxide particles have been produced with an average diameter less than about 250 nm. The particles have a high degree of uniformity. The particles can be formed by the heat treatment of nanoparticles of manganese oxide. Alternatively, crystalline lithium manganese oxide particles can be formed directly by laser pyrolysis. The lithium manganese oxide particles are useful as active materials in the positive electrodes of lithium based batteries. Improved batteries result from the use of uniform nanoscale lithium manganese oxide particles.
    Type: Grant
    Filed: June 16, 1999
    Date of Patent: November 19, 2002
    Assignee: NanoGram Corporation
    Inventors: Sujeet Kumar, Hariklia Dris Reitz, Craig R. Horne, James T. Gardner, Ronald J. Mosso, Xiangxin Bi
  • Publication number: 20020142218
    Abstract: Laser pyrolysis can be used to produce directly metal vanadium oxide composite nanoparticles. To perform the pyrolysis a reactant stream is formed including a vanadium precursor and a second metal precursor. The pyrolysis is driven by energy absorbed from a light beam- Metal vanadium oxide nanoparticles can be incorporated into a cathode of a lithium based battery to obtain increased energy densities. Implantable defibrillators can be constructed with lithium based batteries having increased energy densities.
    Type: Application
    Filed: April 1, 2002
    Publication date: October 3, 2002
    Applicant: NanoGram Corporation
    Inventors: Hariklia Dris Reitz, James P. Buckley, Sujeet Kumar, Yu K. Fortunak, Xiangxin Bi
  • Publication number: 20020075126
    Abstract: A collection of zinc oxide nanoparticles have been produced by laser pyrolysis. The zinc oxide nanoparticles have average particle diameters of less than about 95 nm and a very narrow particle size distribution. The laser pyrolysis process is characterized by the production of a reactant stream within the reaction chamber, where the reactant stream includes a zinc precursor and other reactants. The zinc precursor can be delivered as an aerosol.
    Type: Application
    Filed: October 3, 2001
    Publication date: June 20, 2002
    Inventors: Hariklia Dris Reitz, Sujeet Kumar, Xiangxin Bi, Nobuyuki Kambe, Ronald J. Mosso, James T. Gardner
  • Publication number: 20020064497
    Abstract: Metal vanadium oxide particles have been produced with an average diameter less than about 500 nm. The particles are produced from nanocrystalline vanadium oxide particles. Silver vanadium oxide particles, for example, can be formed by the heat treatment of a mixture of nanoscale vanadium oxide and a silver compound. Other metal vanadium oxide particles can be produced by similar processes. The metal vanadium oxide particles have very uniform properties.
    Type: Application
    Filed: January 9, 2001
    Publication date: May 30, 2002
    Inventors: Craig R. Horne, Sujeet Kumar, James P. Buckley, Xiangxin Bi