Patents by Inventor Clark David NELSON
Clark David NELSON 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: 11060023Abstract: A process for preparing a population of coated phosphor particles is presented. The process includes combining particles of a phosphor of formula I: Ax [MFy]:Mn4+ with a first solution including a compound of formula II: Ax[MFy] to form a suspension, where A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is an absolute value of a charge of the [MFy] ion; and y is 5, 6 or 7. The process further includes combining a second solution including a source A+ ions with the suspension.Type: GrantFiled: August 9, 2018Date of Patent: July 13, 2021Assignee: CURRENT LIGHTING SOLUTIONS, LLCInventors: Fangming Du, Clark David Nelson, Sara Ann Krosschell
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Patent number: 10883045Abstract: A method includes obtaining a potassium hexafluorosilicate (PFS)-based powder, obtaining a fluidization material, and mixing the PFS-based powder with the fluidization material to form a PFS-based mixture. The PFS-based mixture is configured to be mixed with a resinous material to form a flowing phosphor blend configured to be placed onto a light source to form a phosphor on the light source.Type: GrantFiled: December 9, 2016Date of Patent: January 5, 2021Assignee: CURRENT LIGHTING SOLUTIONS, LLCInventors: William Winder Beers, Fangming Du, Clark David Nelson
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Patent number: 10851293Abstract: 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: GrantFiled: January 20, 2017Date of Patent: December 1, 2020Assignee: CURRENT LIGHTING SOLUTIONS, LLCInventors: Fangming Du, William Winder Beers, William Erwin Cohen, Clark David Nelson
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Patent number: 10793773Abstract: A process for preparing a Mn+4 doped phosphor of formula I includes gradually adding a first solution comprising a source of M and HF and a second solution comprising a source of Mn to a reactor, in the presence of a source of A and an anion selected from phosphate, sulfate, acetate, and combinations thereof, to form a product liquor comprising the Mn+4 doped phosphor. The process also includes gradually discharging the product liquor from the reactor while volume of the product liquor in the reactor remains constant. 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.Type: GrantFiled: September 20, 2017Date of Patent: October 6, 2020Assignee: CURRENT LIGHTING SOLUTIONS, LLCInventors: Fangming Du, James Edward Murphy, Srinivas Prasad Sista, Clark David Nelson, Jenna Marie Baldesare
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Publication number: 20200199446Abstract: A process for preparing a population of coated phosphor particles is presented. The process includes combining particles of a phosphor of formula I: Ax [MFy]:Mn4+ with a first solution including a compound of formula II: Ax[MFy] to form a suspension, where A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is an absolute value of a charge of the [MFy] ion; and y is 5, 6 or 7. The process further includes combining a second solution including a source A+ ions with the suspension.Type: ApplicationFiled: August 9, 2018Publication date: June 25, 2020Inventors: Fangming DU, Clark David NELSON, Sara Ann KROSSCHELL
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Patent number: 10563121Abstract: 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: GrantFiled: June 2, 2016Date of Patent: February 18, 2020Assignee: CURRENT LIGHTING SOLUTIONS, LLCInventors: William Winder Beers, Jianmin He, Fangming Du, James Edward Murphy, William Erwin Cohen, Clark David Nelson, Cynthia Susan Link
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Publication number: 20190048258Abstract: A process for preparing a population of coated phosphor particles is presented. The process includes combining particles of a phosphor of formula I: Ax[MFy]:Mn4+ with a first solution including a compound of formula II: Ax[MFy] to form a suspension, where A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is an absolute value of a charge of the [MFy] ion; and y is 5, 6 or 7. The process further includes combining a second solution including a source A+ ions with the suspension.Type: ApplicationFiled: August 10, 2017Publication date: February 14, 2019Inventors: Fangming Du, Clark David Nelson, Sara Anne Krosschell
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Publication number: 20180265778Abstract: A process for preparing a Mn+4 doped phosphor of formula I includes gradually adding a first solution comprising a source of M and HF and a second solution comprising a source of Mn to a reactor, in the presence of a source of A and an anion selected from phosphate, sulfate, acetate, and combinations thereof, to form a product liquor comprising the Mn+4 doped phosphor. The process also includes gradually discharging the product liquor from the reactor while volume of the product liquor in the reactor remains constant. 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.Type: ApplicationFiled: September 20, 2017Publication date: September 20, 2018Inventors: Fangming DU, James Edward MURPHY, Srinivas Prasad SISTA, Clark David NELSON, Jenna Marie BALDESARE
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Patent number: 10047286Abstract: 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: GrantFiled: November 24, 2015Date of Patent: August 14, 2018Assignee: GENERAL ELECTRIC COMPANYInventors: Fangming Du, William Winder Beers, William Erwin Cohen, Clark David Nelson, Jenna Marie Novak, John Matthew Root, James Edward Murphy, Srinivas Prasad Sista
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Publication number: 20170313937Abstract: A method includes obtaining a potassium hexafluorosilicate (PFS)-based powder, obtaining a fluidization material, and mixing the PFS-based powder with the fluidization material to form a PFS-based mixture. The PFS-based mixture is configured to be mixed with a resinous material to form a flowing phosphor blend configured to be placed onto a light source to form a phosphor on the light source.Type: ApplicationFiled: December 9, 2016Publication date: November 2, 2017Inventors: William Winder BEERS, Fangming DU, Clark David NELSON
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Publication number: 20170298273Abstract: 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: ApplicationFiled: January 20, 2017Publication date: October 19, 2017Inventors: Fangming Du, William Winder Beers, William Erwin Cohen, Clark David Nelson
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Publication number: 20160289553Abstract: 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: ApplicationFiled: June 2, 2016Publication date: October 6, 2016Inventors: William Winder BEERS, Jianmin HE, Fangming DU, James Edward MURPHY, William Erwin COHEN, Clark David NELSON, Cynthia Susan LINK
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Publication number: 20160115382Abstract: 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: ApplicationFiled: November 24, 2015Publication date: April 28, 2016Inventors: Fangming Du, William Winder Beers, William Erwin Cohen, Clark David Nelson, Jenna Marie Novak, John Matthew Root, James Edward Murphy, Srinivas Prasad Sista
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Patent number: 9117650Abstract: A coating system for a fluorescent lamp, and fluorescent lamps provided therewith. The coating system includes a phosphor-containing coating containing a mixture of phosphors that contain less than 10% weight rare earth phosphors. The phosphor-containing coating emits visible light having a color rendering index of at least 87 when excited by UV radiation.Type: GrantFiled: June 26, 2014Date of Patent: August 25, 2015Assignee: GENERAL ELECTRIC COMPANYInventors: Fangming Du, Brett R. Bradley, William Erwin Cohen, Nathaniel Jon Farkas, Clark David Nelson
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Publication number: 20140306598Abstract: A coating system for a fluorescent lamp, and fluorescent lamps provided therewith. The coating system includes a phosphor-containing coating containing a mixture of phosphors that contain less than 10% weight rare earth phosphors. The phosphor-containing coating emits visible light having a color rendering index of at least 87 when excited by UV radiation.Type: ApplicationFiled: June 26, 2014Publication date: October 16, 2014Inventors: Fangming DU, Brett R. BRADLEY, William Erwin COHEN, Nathaniel Jon FARKAS, Clark David NELSON