Patents by Inventor Erwin Cohen

Erwin Cohen 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: 20190086038
    Abstract: The specification and drawings present a new apparatus such as a lighting apparatus, the apparatus comprising at least one LED (or OLED) module, configured to generate a visible light such as white light, and at least one component such as optical component comprising a compound consisting essentially of the elements neodymium (Nd) and fluorine (F), and optionally including one or more other elements. The lighting apparatus is configured to provide a desired light spectrum by filtering the generated visible light using the compound. The at least one component can comprise a NdFxOy compound with values of x and y determining a content ratio F/O, which may be adjusted during manufacturing of the NdFxOy compound to provide desired output light parameters of the apparatus including at least a desired output light spectrum realized by filtering the generated visible light using the NdFxOy compound.
    Type: Application
    Filed: March 16, 2016
    Publication date: March 21, 2019
    Inventors: Kevin Jeffrey BENNER, Thomas J. BOYLE, Dengke CAI, Thomas CLYNNE, William Erwin COHEN, Jean-Patrick DUCROUX, Jianmin HE, Jon Bennett JANSMA, Chuan LIN, Juliana P. REISMAN, Alok Mani SRIVASTAVA, Benjamin James WARD, Zhiyong WANG, William Robert WRIGHT, Qing YI
  • Patent number: 10047286
    Abstract: A process for preparing a Mn+4 doped phosphor of formula I Ax[MFy|:Mn+4??I includes gradually adding a first solution to a second solution and periodically discharging the product liquor from the reactor while volume of the product liquor in the reactor remains constant; wherein A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is the absolute value of the charge of the [MFy] ion; and y is 5, 6 or 7. The first solution includes a source of M and HF and the second solution includes a source of Mn to a reactor in the presence of a source of A.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: August 14, 2018
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Fangming Du, William Winder Beers, William Erwin Cohen, Clark David Nelson, Jenna Marie Novak, John Matthew Root, James Edward Murphy, Srinivas Prasad Sista
  • Publication number: 20180053881
    Abstract: A coated phosphors that include a shell comprising a first Medoped phosphor of formula I Ax[MFy]:Mn4+??I directly disposed on a core comprising a second phosphor. The second phosphor is a material other than a compound of formula I or formula II Ax[MFy]??II wherein A is, independently at each occurrence, Li, Na, K, Rb, Cs, or a combination thereof; M is, independently at each occurrence, Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is the absolute value of the charge of the [MFy] ion; and y is 5, 6 or 7.
    Type: Application
    Filed: August 17, 2016
    Publication date: February 22, 2018
    Inventors: James Edward Murphy, William Winder Beers, William Erwin Cohen
  • Patent number: 9890328
    Abstract: A lighting apparatus that includes a light source and a phosphor composition radiationally coupled to the light source is presented. The phosphor composition includes a first phosphor that includes a phase of general formula (I): L3ZO4(Br2-nXn):Eu2+ wherein 0?n?1; L is Zn, Mg, Ca, Sr, Ba, or combinations thereof; Z is Si, Ge, or a combination thereof; and X is F, Cl, I, or combinations thereof.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: February 13, 2018
    Assignee: General Electric Company
    Inventors: Samuel Joseph Camardello, Alok Mani Srivastava, Fangming Du, Holly Ann Comanzo, William Winder Beers, William Erwin Cohen
  • Publication number: 20170298273
    Abstract: A method includes mixing a first fluoride phosphor powder that is doped with tetravalent manganese with a treatment solution for a designated period of time, stopping the mixing to allow the fluoride phosphor powder to settle, removing at least some liquid that has separated from the first fluoride phosphor powder, repeating (a) the mixing, (b) the stopping of the mixing, and (c) removing at least some of the liquid during one or more additional cycles, and obtaining a second fluoride phosphor powder following the repeating of the mixing, the stopping of the mixing, and the removing of at least some of the liquid. The second fluoride phosphor powder includes a reduced amount of the manganese relative to the first fluoride phosphor powder.
    Type: Application
    Filed: January 20, 2017
    Publication date: October 19, 2017
    Inventors: Fangming Du, William Winder Beers, William Erwin Cohen, Clark David Nelson
  • Patent number: 9633830
    Abstract: Coating systems suitable for use in generating fluorescent visible light, and lamps provided with such coating systems. The coating systems includes a phosphor-containing coating that contains at least a first phosphor that is predominantly excited by ultraviolet radiation of a first wavelength to emit visible light and absorbs but is less efficiently excited by ultraviolet radiation of a second wavelength. The coating system further includes a second phosphor that absorbs the ultraviolet radiation of the second wavelength and little if any of the ultraviolet radiation of the first wavelength.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: April 25, 2017
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Alok Mani Srivastava, William Winder Beers, Fangming Du, William Erwin Cohen
  • Patent number: 9605199
    Abstract: Blue and green-emitting Eu2+-activated oxyhalide phosphors of formula A-E may be used in devices for lighting or display applications: A. M3SiO3X4:Eu2+; B. M5Si3O9X4:Eu2+; C. M1.64Si0.82O3.1X0.36:Eu2+; D. M10Si3O9X14:Eu2+; E. M2SiO3X2:Eu2+; and wherein M is Ba, Ca, Sr, or a mixture thereof; X is Cl or Br, or a mixture thereof.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: March 28, 2017
    Assignee: General Electric Company
    Inventors: Sam Joseph Camardello, Alok Mani Srivastava, Holly Ann Comanzo, William Winder Beers, Fangming Du, William Erwin Cohen
  • Patent number: 9537061
    Abstract: A phosphor composition is disclosed. A phosphor composition, comprises at least 10 atomic % bromine; silicon, germanium or combination thereof; oxygen; a metal M, wherein M comprises zinc (Zn), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), or combinations thereof; and an activator comprising europium. The phosphor composition is formed from combining carbonate or oxides of metal M, silicon oxide, and europium oxide; and then firing the combination. A lighting apparatus including the phosphor composition is also provided. The phosphor composition may be combined with an additional phosphor to generate white light.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: January 3, 2017
    Assignee: General Electric Company
    Inventors: Alok Mani Srivastava, Holly Ann Comanzo, William Winder Beers, Samuel Joseph Camardello, Fangming Du, William Erwin Cohen
  • Publication number: 20160289553
    Abstract: A method includes obtaining particles of a phosphor precursor of formula Ax[MFy]:Mn4+, reducing sizes of the particles of the phosphor precursor by wet milling the particles and annealing the particles that are wet milled by contacting the particles with a fluorine-containing oxidizing agent. Additionally, a manganese doped complex fluoride phosphor prepared by this method is provided. A lighting apparatus and backlight device that include manganese-doped phosphor prepared by this method also are provided.
    Type: Application
    Filed: June 2, 2016
    Publication date: October 6, 2016
    Inventors: William Winder BEERS, Jianmin HE, Fangming DU, James Edward MURPHY, William Erwin COHEN, Clark David NELSON, Cynthia Susan LINK
  • Patent number: 9404034
    Abstract: Coating systems suitable for use in fluorescent lamps, particularly as scattering agents within a UV-reflecting coating for the purpose of improving fluorescent lamp luminosity. Such a coating system is provided on a transparent or translucent substrate and includes a phosphor coating and a scattering agent that scatters UV rays. The scattering agent includes an inorganic powder present in a separate UV-reflecting layer adjacent the phosphor coating and/or dispersed in the phosphor coating so that the scattered UV rays are absorbed by the phosphor coating and cause the phosphor coating to emit visible light. The inorganic powder exhibits low or no absorption to UV rays having wavelengths of 185 nm and 254 nm and is not reactive with mercury.
    Type: Grant
    Filed: December 23, 2013
    Date of Patent: August 2, 2016
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Fangming Du, Alok Mani Srivastava, William Winder Beers, William Erwin Cohen
  • Publication number: 20160172549
    Abstract: A phosphor composition is disclosed. A phosphor composition, comprises at least 10 atomic % bromine; silicon, germanium or combination thereof; oxygen; a metal M, wherein M comprises zinc (Zn), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), or combinations thereof; and an activator comprising europium. The phosphor composition is formed from combining carbonate or oxides of metal M, silicon oxide, and europium oxide; and then firing the combination. A lighting apparatus including the phosphor composition is also provided. The phosphor composition may be combined with an additional phosphor to generate white light.
    Type: Application
    Filed: December 12, 2014
    Publication date: June 16, 2016
    Inventors: Alok Mani Srivastava, Holly Ann Comanzo, William Winder Beers, Samuel Joseph Camardello, Fangming Du, William Erwin Cohen
  • Publication number: 20160168457
    Abstract: A phosphor composition is presented. The phosphor composition includes a first phosphor that includes a phase of general formula (I): L3ZO4(Br2-nXn):Eu2+?? (I) wherein 0?n?1; L is Zn, Mg, Ca, Sr, Ba, or combinations thereof; Z is Si, Ge, or a combination thereof; and X is F, Cl, I, or combinations thereof. A lighting apparatus that includes a light source and the phosphor composition radiationally coupled to the light source is also presented.
    Type: Application
    Filed: June 23, 2015
    Publication date: June 16, 2016
    Inventors: Samuel Joseph Camardello, Alok Mani Srivastava, Fangming Du, Holly Ann Comanzo, William Winder Beers, William Erwin Cohen
  • Patent number: 9346999
    Abstract: A method of forming a phosphor composition is disclosed. The method includes mixing co-precipitated yttrium-europium oxalate with an inorganic flux material to form an oxalate-flux mixture; and heating the oxalate-flux mixture at a temperature in a range from about 800° C. to about 1400° C., to form the phosphor composition. The phosphor has a general formula of (Y1-x-yAyEux)2O3 with 0<x<1 and 0?y<1, wherein A is at least one element selected from the group consisting of gadolinium, lutetium, lanthanum, scandium and terbium.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: May 24, 2016
    Assignee: General Electric Company
    Inventors: Holly Ann Comanzo, Alok Mani Srivastava, William Winder Beers, William Erwin Cohen
  • Patent number: 9335011
    Abstract: A lighting apparatus having a phosphor material radiationally coupled to a light source is presented. The phosphor material includes a green emitting phosphor composition of general formula I: R3?x?zMxCezT5?yNyO12?x?yFx+y; where 0?x<3.0; 0?y<5.0, 0<z?0.30; and if x=0, then y>0 or if y=0, then x>0; R is Y, Tb, Gd, La, Lu or a combination thereof; T is Al, Sc, Ga, In or combinations thereof; M is Ca, Sr, Ba or a combination thereof; N is Mg, Zn or a combination thereof. The phosphor composition of formula I may be combined with an additional phosphor to generate white light.
    Type: Grant
    Filed: July 2, 2014
    Date of Patent: May 10, 2016
    Assignee: General Electric Company
    Inventors: Alok Mani Srivastava, William Winder Beers, William Erwin Cohen, Holly Ann Comanzo
  • Patent number: 9328878
    Abstract: A green emitting phosphor composition is disclosed. A phosphor composition of formula Ca1-xEuxAlB3O7, where 0<x<0.5 is formed from combining calcium carbonate, boron oxide, aluminum oxide, and europium oxide; and then firing the combination. A lighting apparatus including the phosphor composition is also provided. The phosphor composition may be combined with an additional phosphor to generate white light.
    Type: Grant
    Filed: July 2, 2014
    Date of Patent: May 3, 2016
    Assignee: General Electric Company
    Inventors: Alok Mani Srivastava, William Winder Beers, William Erwin Cohen, Holly Ann Comanzo
  • Publication number: 20160115382
    Abstract: A process for preparing a Mn+4 doped phosphor of formula I Ax[MFy]:Mn+4?? I includes gradually adding a first solution to a second solution and periodically discharging the product liquor from the reactor while volume of the product liquor in the reactor remains constant; wherein A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is the absolute value of the charge of the [MFy] ion; y is 5, 6 or 7. The first solution includes a source of M and HF and the second solution includes a source of Mn to a reactor in the presence of a source of A.
    Type: Application
    Filed: November 24, 2015
    Publication date: April 28, 2016
    Inventors: Fangming Du, William Winder Beers, William Erwin Cohen, Clark David Nelson, Jenna Marie Novak, John Matthew Root, James Edward Murphy, Srinivas Prasad Sista
  • Patent number: 9321959
    Abstract: Processes for producing particles of rare earth-containing phosphor materials, in which the particles have a core-shell structure and the shell has a lower rare earth content than the core. Such a process may include contacting a core particle with a precursor comprising Na(La,Ce,Tb)P2O7 to form a mixture, and then heating the mixture to a temperature sufficient to decompose the Na(La,Ce,Tb)P2O7 to evolve and melt an NaPO3 flux and initiate deposition of a (La,Ce,Tb)PO4 shell on each core particle in the presence of the molten NaPO3 flux.
    Type: Grant
    Filed: August 25, 2014
    Date of Patent: April 26, 2016
    Assignee: GENERAL ELECTRIC COMAPNY
    Inventors: Alok Mani Srivastava, Holly Ann Comanzo, William Winder Beers, Samuel Joseph Camardello, Digamber Gurudas Porob, William Erwin Cohen
  • Publication number: 20160079053
    Abstract: Phosphor-containing coating compositions and methods capable of changing the lumen maintenance characteristics of phosphor-containing coatings and fluorescent lamps that utilize such coatings. Lumen maintenance of a fluorescent lamp can be modified by forming a phosphor-containing coating to contain at least a first phosphor that depreciates during operation of the fluorescent lamp, and forming the phosphor-containing coating to further contain an additive composition in a sufficient amount and sufficiently uniformly distributed in the phosphor-containing coating to inhibit depreciation of the first phosphor during operation of the fluorescent lamp.
    Type: Application
    Filed: September 16, 2014
    Publication date: March 17, 2016
    Inventors: Jon Bennett JANSMA, William Winder BEERS, William Erwin COHEN, Fangming DU
  • Publication number: 20160064203
    Abstract: Coating systems suitable for use in generating fluorescent visible light, and lamps provided with such coating systems. The coating systems includes a phosphor-containing coating that contains at least a first phosphor that is predominantly excited by ultraviolet radiation of a first wavelength to emit visible light and absorbs but is less efficiently excited by ultraviolet radiation of a second wavelength. The coating system further includes a second phosphor that absorbs the ultraviolet radiation of the second wavelength and little if any of the ultraviolet radiation of the first wavelength.
    Type: Application
    Filed: August 28, 2014
    Publication date: March 3, 2016
    Inventors: Alok Mani SRIVASTAVA, William Winder BEERS, Fangming DU, William Erwin COHEN
  • Publication number: 20160053171
    Abstract: Processes for producing particles of rare earth-containing phosphor materials, in which the particles have a core-shell structure and the shell has a lower rare earth content than the core. Such a process may include contacting a core particle with a precursor comprising Na(La,Ce,Tb)P2O7 to form a mixture, and then heating the mixture to a temperature sufficient to decompose the Na(La,Ce,Tb)P2O7 to evolve and melt an NaPO3 flux and initiate deposition of a (La,Ce,Tb)PO4 shell on each core particle in the presence of the molten NaPO3 flux.
    Type: Application
    Filed: August 25, 2014
    Publication date: February 25, 2016
    Inventors: Alok Mani SRIVASTAVA, Holly Ann COMANZO, William Winder BEERS, Samuel Joseph CAMARDELLO, Digamber Gurudas POROB, William Erwin COHEN