Patents by Inventor Mani Srivastava

Mani Srivastava 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).

  • Rules for efficient light sources using phosphor converted LEDs
    Patent number: 7884382
    Abstract: An LED lamp including an LED and one or more phosphors, wherein for each phosphor, a figure of merit (FOM) defined as the product of (incident LED flux)×(excitation cross-section of the phosphor)×(phosphor material decay time) is less than 0.3. Such an arrangement provides a light emitting device with improved lumen output and color stability over a range of drive currents.
    Type: Grant
    Filed: February 22, 2005
    Date of Patent: February 8, 2011
    Assignee: GE Lighting Solutions, LLC
    Inventors: Anant A. Setlur, Steven Duclos, Josesph Shiang, Alok Mani Srivastava, Holly Ann Comanzo, Stanton Earl Weaver, Charles Adrian Becker, Thomas Soules
  • NANOSTRUCTURED FUNCTIONAL COATINGS AND DEVICES
    Publication number: 20110012086
    Abstract: In one aspect of the present invention, an article including a nanostructured functional coating disposed on a substrate is described. The functional coating is characterized by both anti-reflection properties and down-converting properties. Related optoelectronic devices are also described.
    Type: Application
    Filed: July 15, 2009
    Publication date: January 20, 2011
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Loucas Tsakalakos, Eric Gardner Butterfield, Alok Mani Srivastava, Bastiaan Arie Korevaar
  • Red line emitting complex fluoride phosphors activated with Mn4+
    Patent number: 7847309
    Abstract: New phosphor materials including a complex fluoride phosphor activated with Mn4+ which may include at least one of (A) A2[MF7]:Mn4+, wherein A=Li, Na, K, Rb, Cs, NH4, or a combination thereof, and M=Nb, Ta or a combination thereof; and (B) A3[XF6]:Mn4+, wherein A=Li, Na, K, Rb, Cs, NH4, or a combination thereof, and X=Sc, Y, La, a lanthanide, Bi, or a combination thereof.
    Type: Grant
    Filed: July 16, 2008
    Date of Patent: December 7, 2010
    Assignee: GE Lighting Solutions, LLC
    Inventors: Emil Vergilov Radkov, Anant Achyut Setlur, Alok Mani Srivastava, Ljudmil Slavchev Grigorov
  • COMPOSITION, ARTICLE, AND METHOD
    Publication number: 20100230601
    Abstract: A polycrystalline scintillator composition is provided. The polycrystalline scintillator composition is capable of being sintered to form a body having a pulse height resolution that is less than about 20 percent at 662 kilo electron volts. Also, an article formed form the polycrystalline scintillator composition is provided, as well as a radiation detector including the article.
    Type: Application
    Filed: January 30, 2007
    Publication date: September 16, 2010
    Applicant: General Electric Company
    Inventors: Sergio Paulo Martins Loureiro, Alok Mani Srivastava, Kevin Paul McEvoy, Venkat Subramaniam Venkataramani, Steven Jude Duclos, James Scott Vartuli, Carl Joshua Vess
  • LED illumination device with layered phosphor pattern
    Patent number: 7740514
    Abstract: A method of applying at least two phosphors to an LED, wherein a first phosphor material having a lower absorption, shorter luminescence decay time, and/or lower thermal quenching than a second phosphor material is positioned closer to the LED than the second phosphor. Such an arrangement provides a light emitting device with improved lumen output and color stability over a range of drive currents.
    Type: Grant
    Filed: December 20, 2007
    Date of Patent: June 22, 2010
    Assignee: Lumination LLC
    Inventors: Anant Achyut Setlur, Joseph John Shiang, Alok Mani Srivastava, Holly Ann Comanzo, Stanton Earl Weaver, Charles Adrian Becker
  • METHODS FOR PREPARATION OF NANOCRYSTALLINE RARE EARTH PHOSPHATES FOR LIGHTING APPLICATIONS
    Publication number: 20100148658
    Abstract: Disclosed here are methods for the preparation of optionally activated nanocrystalline rare earth phosphates. The optionally activated nanocrystalline rare earth phosphates may be used as one or more of quantum-splitting phosphor, visible-light emitting phosphor, vacuum-UV absorbing phosphor, and UV-emitting phosphor. Also disclosed herein are discharge lamps comprising the optionally activated nanocrystalline rare earth phosphates provided by these methods.
    Type: Application
    Filed: December 11, 2008
    Publication date: June 17, 2010
    Applicant: General Electric Company
    Inventors: Holly Ann Comanzo, Mohan Manoharan, Sergio Paulo Martins Loureiro, Anant Achyut Setlur, Alok Mani Srivastava
  • ARTICLES USING PERSISTENT PHOSPHORS
    Publication number: 20100136302
    Abstract: An article of manufacture that comprises a structure that is a security system device (or portion thereof) or a fire system device (or portion), where a persistent phosphor and/or a persistent phosphor blend is either integrated in a coating on the structure; applied on the structure; or integrated in the structure, wherein the persistent phosphor comprises certain phosphors or phosphor blends. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.
    Type: Application
    Filed: December 17, 2009
    Publication date: June 3, 2010
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Holly Ann Comanzo, Alok Mani Srivastava, Steven Jude Duclos, Lucas Lemar Clarke, Munro Howard Sykes
  • SCINTILLATOR MATERIALS WHICH ABSORB HIGH-ENERGY, AND RELATED METHODS AND DEVICES
    Publication number: 20100127176
    Abstract: A scintillator composition is described, including a lutetium silicate or lutetium phosphate matrix; along with selected amounts of cerium, praseodymium, and gadolinium. A radiation detector for detecting high-energy radiation is also described. The radiation detector incorporates a crystal scintillator having the composition mentioned above. Related methods for detecting high-energy radiation with a scintillation detector are also disclosed herein.
    Type: Application
    Filed: November 21, 2008
    Publication date: May 27, 2010
    Applicant: GENERAL ELECTRIC COMPANY
    Inventor: Alok Mani Srivastava
  • Composition, article, and method
    Patent number: 7700003
    Abstract: A method is provided that includes heating a powder to a temperature that is below the melting point of the scintillator composition but is sufficiently high to form a coherent mass. The powder includes a scintillator composition. The coherent mass is polycrystalline and has a pulse height resolution that is less than 20 percent at 662 kilo electron volts; a light yield of more than 5000 photons per milli electron volt; or both a pulse height resolution that is less than 20 percent at 662 kilo electron volts and a light yield of more than 5000 photons per milli electron. A sintered body is provided also.
    Type: Grant
    Filed: January 30, 2007
    Date of Patent: April 20, 2010
    Assignee: General Electric Company
    Inventors: Sergio Paulo Martins Loureiro, Alok Mani Srivastava, Kevin Paul McEvoy, Venkat Subramaniam Venkataramani, Steven Jude Duclos, James Scott Vartuli, Carl Joshua Vess
  • Electrode materials for electric lamps and methods of manufacture thereof
    Patent number: 7652415
    Abstract: An electron emissive material comprises an alkaline earth metal halide composition and operable to emit electrons on excitation. A lamp including an envelope, an electrode including an alkaline earth metal halide electron emissive material and a discharge material, is also disclosed.
    Type: Grant
    Filed: October 20, 2005
    Date of Patent: January 26, 2010
    Assignee: General Electric Company
    Inventors: Gopi Chandran Ramachandran, Alok Mani Srivastava, Timothy John Sommerer, Suchismita Sanyal, Prasanth Kumar Nammalwar, Holly Ann Comanzo, William Winder Beers, Madras Venugopal Shankar
  • Red line emitting phosphors for use in led applications
    Patent number: 7648649
    Abstract: Light emitting devices including backlights having a light source and a phosphor material including a complex fluoride phosphor activated with Mn4+ which may include at least one of (A) A2[MF5]:Mn4+; where A is selected from Li, Na, K, Rb, Cs, NH4, and combinations thereof; and where M is selected from Al, Ga, In, or combinations thereof; (B) A3[MF6]:Mn4+, where A is selected from Li, Na, K, Rb, Cs, NH4, and combinations thereof; and where M is selected from Al, Ga, In, or combinations thereof; (C) Zn2[MF7]:Mn4+, where M is selected from Al, Ga, In, or combinations thereof; and (D) A[In2F7]:Mn4+ where A is selected from Li, Na, K, Rb, Cs, NH4, or combinations thereof.
    Type: Grant
    Filed: February 13, 2007
    Date of Patent: January 19, 2010
    Assignee: Lumination LLC
    Inventors: Emil Vergilov Radkov, Anant Achyut Setlur, Alok Mani Srivastava, Ljudmil Slavchev Grigorov
  • Scintillator compositions containing cerium and praseodymium activator ions, and related methods and articles of manufacture
    Patent number: 7605373
    Abstract: A scintillator composition is described. The scintillator composition includes a lutetium phosphate matrix, a cerium activator ion for the matrix material, a praseodymium activator ion, and any reaction products thereof. Radiation detectors that use scintillators for detecting high-energy radiation are also described. Related methods for detecting high-energy radiation are also included.
    Type: Grant
    Filed: December 1, 2006
    Date of Patent: October 20, 2009
    Assignee: General Electric Company
    Inventor: Alok Mani Srivastava
  • Scintillator compositions, and related processes and articles of manufacture
    Patent number: 7576329
    Abstract: Scintillator materials based on certain types of halide-lanthanide matrix materials are described. In one embodiment, the matrix material contains a mixture of lanthanide halides, i.e., a solid solution of at least two of the halides, such as lanthanum chloride and lanthanum bromide. In another embodiment, the matrix material is based on lanthanum iodide alone, which must be substantially free of lanthanum oxyiodide. The scintillator materials, which can be in monocrystalline or polycrystalline form, also include an activator for the matrix material, e.g., cerium. To further improve the stopping power and the scintillating efficiency of these halide scintillators, the addition of bismuth is disclosed. Radiation detectors that use the scintillators are also described, as are related methods for detecting high-energy radiation.
    Type: Grant
    Filed: December 20, 2005
    Date of Patent: August 18, 2009
    Assignee: General Electric Company
    Inventors: Alok Mani Srivastava, Steven Jude Duclos, Lucas Lemar Clarke, Holly Ann Comanzo, Qun Deng
  • Scintillating compositions for detecting neutrons and methods of making the same
    Patent number: 7572392
    Abstract: Solid-state scintillating compositions for detecting neutrons comprise a Li4Zn(PO4)2 host lattice. Methods of making scintillating compositions comprise: dissolving a lithium-6 precursor and a zinc precursor in a solvent to form a solution; combining phosphoric acid with the solution; combining a base with the solution to form a precipitate; and heating the precipitate to form a Li4Zn(PO4)2 host lattice.
    Type: Grant
    Filed: January 10, 2007
    Date of Patent: August 11, 2009
    Assignee: General Electric Company
    Inventors: Brent Allen Clothier, Sergio Paulo Martins Loureiro, Venkat Subramaniam Venkataramani, Alok Mani Srivastava
  • Phosphor and blends thereof for use in LEDs
    Patent number: 7573072
    Abstract: Phosphor compositions having the formula (Ba,Sr,Ca)SiO4:Eu and light emitting devices including a semiconductor light source and the above phosphor. Also disclosed are blends of (Ba,Sr,Ca)SiO4:Eu and one or more additional phosphors and light emitting devices incorporating the same. Preferred blends include (Sr,Ba,Ca)2SiO4:Eu and at least one of (Sr,Mg,Ca,Ba,Zn)2P2O7:Eu,Mn; (Ca,Sr,Ba,Mg)5(PO4)3(Cl,F,OH):Eu,Mn; (Sr,Ba,Ca)MgAl10O17:Eu,Mn; and Mg4FGeO6:Mn4+; and one or more garnet phosphors having the general formula (Y,Gd,La,Lu,T,Pr,Sm)3(Al,Ga,In)5O12:Ce.
    Type: Grant
    Filed: March 10, 2004
    Date of Patent: August 11, 2009
    Assignee: Lumination LLC
    Inventors: Anant Achyut Setlur, Alok Mani Srivastava, Holly Ann Comanzo, Dan Hancu, Linda Jane Valyou Briel
  • PERSISTENT PHOSPHOR
    Publication number: 20090152497
    Abstract: A long-lived phosphor composition is provided, along with methods for making and using the composition. More specifically, in one embodiment, the phosphor comprises a material having a formula of Ax-y-zAl2-m-n-o-pO4:Euy, REz, Bm, Znn, Coo, Scp. In this formula, A may be Ba, Sr, Ca, or a combination of these metals, x is between about 0.75 and 1.3, y is between about 0.0005 and 0.1, z is between about 0.0005 and 0.1, m is between about 0.0005 and 0.30, n is between about 0.0005 and 0.10, o is between about 0 and 0.01 and p is between about 0 and 0.05. RE is Dy, Nd, or a combination thereof. In another embodiment, methods are provided for making persistent phosphors comprising the formulations above. Other embodiments provide applications for such a phosphor, comprising uses in toys, emergency equipment, clothing, and instrument panels, among others.
    Type: Application
    Filed: December 12, 2007
    Publication date: June 18, 2009
    Applicant: General Electric Company
    Inventors: Holly Ann Comanzo, Alok Mani Srivastava, William W. Beers, Sergio Paulo Loureiro, Anant Achyut Setlur, Stanley John Stoklosa, Claire S. Henderson
  • SCINTILLATOR MATERIALS BASED ON LANTHANIDE SILICATES OR LANTHANIDE PHOSPHATES, AND RELATED METHODS AND ARTICLES
    Publication number: 20090146065
    Abstract: A scintillator composition is described. The composition includes a matrix material in the form of a host lattice characterized by a 4f5d?4f optical transition under activation. The matrix material is based on certain lithium-lanthanide silicate compounds or alkali-lanthanide phosphate compounds. The composition also includes a praseodymium (Pr) activator for the matrix material. Radiation detectors which include crystal scintillators are also part of the present invention, as are methods for detecting high-energy radiation, using these devices.
    Type: Application
    Filed: December 7, 2007
    Publication date: June 11, 2009
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Alok Mani Srivastava, Holly Ann Comanzo, James Scott Vartuli
  • Scintillator compositions based on lanthanide halides, and related methods and articles
    Patent number: 7541589
    Abstract: A scintillator composition is described, including a matrix material and an activator. The matrix material includes at least one lanthanide halide compound. The matrix can also include at least one alkali metal, and in some embodiments, at least one alkaline earth metal. The composition also includes a praseodymium activator for the matrix. Radiation detectors that include the scintillators are disclosed. A method for detecting high-energy radiation with a radiation detector is also described.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: June 2, 2009
    Assignee: General Electric Company
    Inventors: Alok Mani Srivastava, Steven Jude Duclos, Lucas Lemar Clarke, Holly Ann Comanzo, Qun Deng
  • Phosphor and blends thereof for use in LEDs
    Patent number: 7501753
    Abstract: Phosphor compositions having the formula EueMmAaGgQqNnXx, where M is at least one of Be, Mg, Ca, Sr, Ba, Cd, Sn, Pb or Zn; A is at least one of B, Al, Ga, In, Bi, Sc, Y, La or a rare earth element other than Eu; G is at least one of Si or Ge; Q is at least one of O, S, and Se; X is at least one of F, Cl, Br and I; 0<e<2, 0<m<2, 0?a<1, 0<g<1, 0<q<4, 0?n<2, 0?x<2, and 2e+2m+3a+4g=2q+3n+x; and light emitting devices including a light source and the above phosphor. Also disclosed are blends of EueMmAaGgQqNnXx and one or more additional phosphors and light emitting devices incorporating the same.
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: March 10, 2009
    Assignee: Lumination LLC
    Inventors: Dan Hancu, Mukunda Adyam, Emil Radkov, Prasanth Kumar, Anant Achyut Setlur, Alok Mani Srivastava, Holly Ann Comanzo, Gopi Chandran, Madras Venugopal Shankar
  • Red line emitting phosphor materials for use in LED applications
    Patent number: 7497973
    Abstract: Light emitting devices including a light source and a phosphor material including a complex fluoride phosphor activated with Mn4+ which may comprise at least one of (1) A2[MF6]:Mn4+, where A is selected from Li, Na, K, Rb, Cs, NH4, and combinations thereof; and where M is selected from Ge, Si, Sn, Ti, Zr, and combinations thereof; (2) E[MF6]:Mn4+, where E is selected from Mg, Ca, Sr, Ba, Zn, and combinations thereof; and where M is selected from Ge, Si, Sn, Ti, Zr, and combinations thereof; (3) Ba0.65Zr0.35F2.70:Mn4+; or (4) A3[ZrF7]:Mn4+ where A is selected from Li, Na, K, Rb, Cs, NH4, and combinations thereof.
    Type: Grant
    Filed: February 28, 2006
    Date of Patent: March 3, 2009
    Assignee: Lumination LLC
    Inventors: Emil Vergilov Radkov, Ljudmil Slavchev Grigorov, Anant Achyut Setlur, Alok Mani Srivastava