Patents by Inventor Digamber Gurudas Porob

Digamber Gurudas Porob 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).

  • Publication number: 20140231857
    Abstract: A phosphor material is presented that includes a blend of a first phosphor, a second phosphor and a third phosphor. The first phosphor includes a composition having a general formula of RE2?yM1+yA2?yScySin-wGewO12+?:Ce3+ wherein RE is selected from a lanthanide ion or Y3+, where M is selected from Mg, Ca, Sr or Ba, A is selected from Mg or Zn and where 0?y?2, 2.5?n?3.5, 0?w?1, and ?1.5???1.5. The second phosphor includes a complex fluoride doped with manganese (Mn4+), and the third phosphor include a phosphor composition having an emission peak in a range from about 520 nanometers to about 680 nanometers. A lighting apparatus including such a phosphor material is also presented. The light apparatus includes a light source in addition to the phosphor material.
    Type: Application
    Filed: September 20, 2012
    Publication date: August 21, 2014
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Prasanth Kumar Nammalwar, Digamber Gurudas Porob, Anant Achyut Setlur, Satya Kishore Manepalli
  • Publication number: 20140178569
    Abstract: A method for making coated zinc silicate phosphor, the method includes the steps of combining a zinc silicate with a rare earth compound under aqueous conditions and removing the water from a product of the combination to form a powder. The powder is fired to form a coated zinc silicate phosphor.
    Type: Application
    Filed: December 20, 2013
    Publication date: June 26, 2014
    Inventors: PRASANTH KUMAR NAMMALWAR, ALOK MANI SRIVASTAVA, SWARNAGOWRI ADDEPALLI, DIGAMBER GURUDAS POROB, WILLIAM ERWIN COHEN, William Winder BEERS
  • Patent number: 8703016
    Abstract: A phosphor material is presented that includes a blend of a first phosphor, a second phosphor and a third phosphor. The first phosphor includes a composition having a general formula of ((Sr1?zMz)1?(x+w)AwCex)3(Al1?ySiy)O4+y+3(x?w)F1?y?3(x?w), wherein 0<x?0.10, 0?y?0.5, 0?z?0.5, 0?w?x, A comprises Li, Na, K, or Rb; and M comprises Ca, Ba, Mg, Zn, or Sn. The second phosphor includes a complex fluoride doped with manganese (Mn4+), and the third phosphor include a phosphor composition having an emission peak in a range from about 520 nanometers to about 680 nanometers. A lighting apparatus including such a phosphor material is also presented. The light apparatus includes a light source in addition to the phosphor material.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: April 22, 2014
    Assignee: General Electric Company
    Inventors: Prasanth Kumar Nammalwar, Anant Achyut Setlur, Digamber Gurudas Porob, Satya Kishore Manepalli
  • Patent number: 8137645
    Abstract: A method of recovering a rare earth constituent from a phosphor is presented. The method can include a number of steps (a) to (d). In step (a), the phosphor is fired with an alkali material under conditions sufficient to decompose the phosphor into a mixture of oxides. A residue containing rare earth oxides is extracted from the mixture in step (b). In step (c), the residue is treated to obtain a solution, which comprises rare earth constituents in salt form. Rare earth constituents are separated from the solution in step (d).
    Type: Grant
    Filed: February 23, 2010
    Date of Patent: March 20, 2012
    Assignee: General Electric Company
    Inventors: Digamber Gurudas Porob, Alok Mani Srivastava, Prasanth Kumar Nammalwar, Gopi Chandran Ramachandran, Holly Ann Comanzo
  • Publication number: 20120019126
    Abstract: An oxynitride phosphor is presented. The oxynitride phosphor has a formula: ApBqOrNs: R such that A is barium or a combination of barium with at least one of Li, Na, K, Y, Sc, Be, Mg, Ca, Sr, Ba, Zn, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, and Lu; B is silicon or a combination of silicon with at least one of Al, B, Ga, and Ge; R is europium or a combination of europium with at least one of Ce, Pr, Sm, Nd, Tb, Dy, Yb, Tm, Er, Ho, and Mn. p, q, r, s are numbers such that p is greater than about 2 and less than about 6, q is greater than about 8 and less than about 10, r is greater than about 0.1 and less than about 6, and s is greater than about 10 and less than about 15. The method of preparing the oxynitride phosphors and light emitting apparatus including the oxynitride phosphors are included.
    Type: Application
    Filed: July 22, 2010
    Publication date: January 26, 2012
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Digamber Gurudas Porob, Anant Achyut Setlur, Prasanth Kumar Nammalwar, Shyamala Halady Subraya Bhat, Satya Kishore Manepalli, Dan Hancu
  • Publication number: 20110311823
    Abstract: A method of making a core-shell phosphor is provided. The method comprises mixing a lanthanum phosphate (LaPO4) core with a shell precursor mixture comprising at least one compound of La, at least one compound of Ce, and at least one compound of Tb to form a core+shell precursor mixture, heating the core+shell precursor mixture to a temperature in a range from about 900° C. to about 1200° C. with an inorganic flux material in presence of a reductant to provide a heated core+shell precursor mixture, cooling the heated core+shell precursor mixture to ambient temperature to provide a product core-shell phosphor dispersed in the inorganic flux material; and separating the product core-shell phosphor from the inorganic flux material.
    Type: Application
    Filed: June 16, 2010
    Publication date: December 22, 2011
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Digamber Gurudas Porob, Alok Mani Srivastava, Holly Ann Comanzo, Gopi Chandran Ramachandran, Prasanth Kumar Nammalwar
  • Publication number: 20110255265
    Abstract: A phosphor material is presented that includes a blend of a first phosphor, a second phosphor and a third phosphor. The first phosphor includes a composition having a general formula of ((Sr1?zMz)1?(x+w)AwCex)3(Al1?ySiy)O4+y+3(x?w)F1?y?3(x?w), wherein 0<x?0.10, 0?y?0.5, 0?z?0.5, 0?w?x, A comprises Li, Na, K, or Rb; and M comprises Ca, Ba, Mg, Zn, or Sn. The second phosphor includes a complex fluoride doped with manganese (Mn4+), and the third phosphor include a phosphor composition having an emission peak in a range from about 520 nanometers to about 680 nanometers. A lighting apparatus including such a phosphor material is also presented. The light apparatus includes a light source in addition to the phosphor material.
    Type: Application
    Filed: June 28, 2011
    Publication date: October 20, 2011
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Prasanth Kumar Nammalwar, Anant Achyut Setlur, Digamber Gurudas Porob, Satya Kishore Manepalli
  • Publication number: 20110223475
    Abstract: A seal structure is provided for an energy storage device. The seal structure includes a sealing glass joining an ion-conducting first ceramic to an electrically insulating second ceramic, wherein the ion-conducting first ceramic has an anode surface defining an anode compartment and a cathode surface defining a cathode compartment, wherein the sealing glass has an exposed portion, wherein the exposed portion is open to one or more of the anode compartment and the cathode compartment, wherein the exposed portion of the sealing glass is coated with a coating composition comprising one or more of boria, alumina, titania, zirconia, yttria, and ceria. Methods for forming the seal structure and article made therefrom are also provided.
    Type: Application
    Filed: March 10, 2010
    Publication date: September 15, 2011
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Digamber Gurudas Porob, Dong-Sil Park, Sundeep Kumar, Atanu Saha
  • Publication number: 20110206580
    Abstract: A method of recovering a rare earth constituent from a phosphor is presented. The method can include a number of steps (a) to (d). In step (a), the phosphor is fired with an alkali material under conditions sufficient to decompose the phosphor into a mixture of oxides. A residue containing rare earth oxides is extracted from the mixture in step (b). In step (c), the residue is treated to obtain a solution, which comprises rare earth constituents in salt form. Rare earth constituents are separated from the solution in step (d).
    Type: Application
    Filed: February 23, 2010
    Publication date: August 25, 2011
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Digamber Gurudas Porob, Alok Mani Srivastava, Prasanth Kumar Nammalwar, Gopi Chandran Ramachandran, Holly Ann Comanzo