Patents by Inventor David W. Johnston

David W. Johnston 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: 11584882
    Abstract: The present invention is directed to a wavelength converter comprising a non-luminescent substrate layer, at least one polysiloxane layer, wherein at least one of the polysiloxane layers comprises a phosphor material. Furthermore, the present invention is directed to a method for preparing a wavelength converter, a light emitting device and a method for preparing a light emitting device.
    Type: Grant
    Filed: February 14, 2020
    Date of Patent: February 21, 2023
    Assignee: OSRAM OPTO SEMICONDUCTORS GMBH
    Inventors: Alan Piquette, Maxim N. Tchoul, David W. Johnston, Gertrud Kraeuter
  • Publication number: 20220131050
    Abstract: The present invention is directed to a method for preparing a glass device comprising the steps of: —preparing a mixture comprising: —at least two glass components, —a solvent, —at least one binder system, —optionally at least one defoamer, —blending the mixture to form a blend mixture, —grinding the blend mixture to form a grinded mixture, —casting the grinded mixture to form a layer, and —drying the layer to form a dried layer of a glass device. The present invention is further directed to a glass device, a wavelength converter and a light emitting device comprising the glass device and/or the wavelength converter.
    Type: Application
    Filed: February 5, 2020
    Publication date: April 28, 2022
    Inventor: David W. JOHNSTON
  • Publication number: 20210253945
    Abstract: The present invention is directed to a wavelength converter comprising a non-luminescent substrate layer, at least one polysiloxane layer, wherein at least one of the polysiloxane layers comprises a phosphor material. Furthermore, the present invention is directed to a method for preparing a wavelength converter, a light emitting device and a method for preparing a light emitting device.
    Type: Application
    Filed: February 14, 2020
    Publication date: August 19, 2021
    Inventors: Alan Piquette, Maxim N. Tchoul, David W. Johnston, Gertrud Kraeuter
  • Patent number: 10950760
    Abstract: The present invention is directed to a method for preparing a glass device comprising the steps of: —preparing a mixture comprising: —at least two glass components, —a solvent, —at least one binder system, —optionally at least one defoamer, —blending the mixture to form a blend mixture, —grinding the blend mixture to form a grinded mixture, —casting the grinded mixture to form a layer, and —drying the layer to form a dried layer of a glass device. The present invention is further directed to a glass device, a wavelength converter and a light emitting device comprising the glass device and/or the wavelength converter.
    Type: Grant
    Filed: February 6, 2019
    Date of Patent: March 16, 2021
    Assignee: OSRAM OPTO SEMICONDUCTORS GMBH
    Inventor: David W. Johnston
  • Publication number: 20200251620
    Abstract: The present invention is directed to a method for preparing a glass device comprising the steps of: —preparing a mixture comprising: —at least two glass components, —a solvent, —at least one binder system, —optionally at least one defoamer, —blending the mixture to form a blend mixture, —grinding the blend mixture to form a grinded mixture, —casting the grinded mixture to form a layer, and —drying the layer to form a dried layer of a glass device. The present invention is further directed to a glass device, a wavelength converter and a light emitting device comprising the glass device and/or the wavelength converter.
    Type: Application
    Filed: February 6, 2019
    Publication date: August 6, 2020
    Inventor: David W. Johnston
  • Patent number: 10487390
    Abstract: A method for producing a laser activated remote phosphor (LARP) sub-assembly, which may comprise: preparing a target composed of a material; activating the target such that the material is released from the target; directing the material released from the target in the direction of a wavelength converter and depositing the material released from the target onto a major surface of the wavelength converter creating a bonding film.
    Type: Grant
    Filed: March 10, 2017
    Date of Patent: November 26, 2019
    Assignee: OSRAM GmbH
    Inventors: Darshan Kundaliya, David W. Johnston, James A. Avallon, Alan L. Lenef
  • Patent number: 10221353
    Abstract: Disclosed herein are wavelength converting compositions, wavelength converters and light sources including the same. The wavelength converting compositions include at least one poly(silphenylene-siloxane) gel matrix that contains at least one wavelength conversion material, such as one or more phosphors in powdered and/or particulate form. Methods of making such compositions and converters are also disclosed. Wavelength converted light sources such as wavelength converted light emitting diode packages are also disclosed. The poly(silphenylene-siloxane) gel matrix exhibits relatively high thermal stability, as well as desirable optical properties.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: March 5, 2019
    Assignee: OSRAM Opto Semiconductors GmbH
    Inventors: Maxim N. Tchoul, David W. Johnston
  • Publication number: 20180258520
    Abstract: A method for producing a laser activated remote phosphor (LARP) sub-assembly, which may comprise: preparing a target composed of a material; activating the target such that the material is released from the target; directing the material released from the target in the direction of a wavelength converter and depositing the material released from the target onto a major surface of the wavelength converter creating a bonding film.
    Type: Application
    Filed: March 10, 2017
    Publication date: September 13, 2018
    Inventors: Darshan Kundaliya, David W. Johnston, James A. Avallon, Alan L. Lenef
  • Patent number: 9553246
    Abstract: A silicone-grafted core-shell particle is described wherein the silicone-grafted core-shell particle comprises a core of an inorganic particle and a shell of a grafted poly(dimethylsiloxane) polymer formed from a bi-terminated poly(dimethylsiloxane) having reactive groups at each terminal end. The silicone-grafted core-shell particles may be dispersed in a polysiloxane polymer matrix and employed as an LED encapsulant.
    Type: Grant
    Filed: July 7, 2016
    Date of Patent: January 24, 2017
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Maxim N. Tchoul, Alan L. Lenef, David W. Johnston
  • Patent number: 9515235
    Abstract: A silicone-grafted core-shell particle is described wherein the silicone-grafted core-shell particle comprises a core of an inorganic particle and a shell of a grafted poly(dimethylsiloxane) polymer formed from a bi-terminated poly(dimethylsiloxane) having reactive groups at each terminal end. The silicone-grafted core-shell particles may be dispersed in a polysiloxane polymer matrix and employed as an LED encapsulant.
    Type: Grant
    Filed: January 15, 2013
    Date of Patent: December 6, 2016
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Maxim N. Tchoul, Alan L. Lenef, David W. Johnston
  • Publication number: 20160347997
    Abstract: Disclosed herein are wavelength converting compositions, wavelength converters and light sources including the same. The wavelength converting compositions include at least one poly(silphenylene-siloxane) gel matrix that contains at least one wavelength conversion material, such as one or more phosphors in powdered and/or particulate form. Methods of making such compositions and converters are also disclosed. Wavelength converted light sources such as wavelength converted light emitting diode packages are also disclosed. The poly(silphenylene-siloxane) gel matrix exhibits relatively high thermal stability, as well as desirable optical properties.
    Type: Application
    Filed: March 30, 2015
    Publication date: December 1, 2016
    Applicant: OSRAM SYLVANIA Inc.
    Inventors: Maxim N. Tchoul, David W. Johnston
  • Publication number: 20160322547
    Abstract: A silicone-grafted core-shell particle is described wherein the silicone-grafted core-shell particle comprises a core of an inorganic particle and a shell of a grafted poly(dimethylsiloxane) polymer formed from a bi-terminated poly(dimethylsiloxane) having reactive groups at each terminal end. The silicone-grafted core-shell particles may be dispersed in a polysiloxane polymer matrix and employed as an LED encapsulant.
    Type: Application
    Filed: July 7, 2016
    Publication date: November 3, 2016
    Applicant: OSRAM SYLVANIA Inc.
    Inventors: Maxim N. Tchoul, Alan L. Lenef, David W. Johnston
  • Patent number: 9240517
    Abstract: Structures for transitioning between two layers of differing lattice parameters are disclosed. In some embodiments, the structures are in the form of a superlattice that serves as a strain relieving transition between two layers of differing lattice parameters. By controlling the properties of the superlattice, the superlattice can exhibit desirable properties such as transparency to light and lattice matching to one of the two layers of differing lattice parameters. Optoelectronic devices such as light emitting diodes including such superlattices are also disclosed.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: January 19, 2016
    Assignee: OSRAM SYLVANIA INC.
    Inventors: David W. Johnston, Richard Speer, Joseph Laski, Kailash C. Mishra
  • Publication number: 20150243840
    Abstract: Structures for transitioning between two layers of differing lattice parameters are disclosed. In some embodiments, the structures are in the form of a superlattice that serves as a strain relieving transition between two layers of differing lattice parameters. By controlling the properties of the superlattice, the superlattice can exhibit desirable properties such as transparency to light and lattice matching to one of the two layers of differing lattice parameters. Optoelectronic devices such as light emitting diodes including such superlattices are also disclosed.
    Type: Application
    Filed: February 21, 2014
    Publication date: August 27, 2015
    Applicant: OSRAM SYLVANIA INC.
    Inventors: David W. Johnston, Richard Speer, Joseph Laski, Kailash C. Mishra
  • Publication number: 20150014727
    Abstract: A silicone-grafted core-shell particle is described wherein the silicone-grafted core-shell particle comprises a core of an inorganic particle and a shell of a grafted poly(dimethylsiloxane) polymer formed from a bi-terminated poly(dimethylsiloxane) having reactive groups at each terminal end. The silicone-grafted core-shell particles may be dispersed in a polysiloxane polymer matrix and employed as an LED encapsulant.
    Type: Application
    Filed: January 15, 2013
    Publication date: January 15, 2015
    Applicant: OSRAM SYLVANIA INC.
    Inventors: Maxim N. Tchoul, Alan L. Lenef, David W. Johnston
  • Patent number: 8827498
    Abstract: A light source (10) comprises a tubular glass heat pipe (12) having a given inside diameter ID. A tubular fiberglass wick (14) is positioned within the glass heat pipe (12). The fiberglass wick (14) has an outside diameter OD substantially equal to the given inside diameter ID and has a substantially centrally located open chamber (16) extending the length thereof. A quantity of an evaporable-condensable medium (17) is provided within the glass heat pipe (12) and a metal cap (18) selected from the group of glass-sealing metals and alloys is fixed to a proximal end (20) of the glass heat pipe (12). Heat dissipaters (22) are fixed to the distal end (24) of the heat pipe (12) and a light emitting diode (26) is fixed to the metal cap (18). Power conducting traces (28) are formed with the heat pipe (12) and are electrically connected to the light emitting diode (26). A lamp (40) can be formed with a plurality of the light sources (10).
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: September 9, 2014
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: David W. Johnston, Gregory Zaslavsky, Jeffery J. Serre
  • Patent number: 8378571
    Abstract: A fluorescent lamp includes a tubular member or envelope having an arc generating and sustaining medium therein. An electrode is provided in each end of the tubular member and a phosphor coating is applied to the interior surface of the tubular member. A mercury dispenser is situated within the tubular member. The mercury dispenser includes a body composed of a material. The body is provided with a bore. A wire plated with a material capable of wetting mercury is provided in the bore. A quantity of mercury is deposited in the bore in contact with the wire.
    Type: Grant
    Filed: October 11, 2010
    Date of Patent: February 19, 2013
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: David W. Johnston, Gregory Zaslavsky, William George
  • Publication number: 20110050085
    Abstract: A fluorescent lamp includes a tubular member or envelope having an arc generating and sustaining medium therein. An electrode is provided in each end of the tubular member and a phosphor coating is applied to the interior surface of the tubular member. A mercury dispenser is situated within the tubular member. The mercury dispenser includes a body composed of a material. The body is provided with a bore. A wire plated with a material capable of wetting mercury is provided in the bore. A quantity of mercury is deposited in the bore in contact with the wire.
    Type: Application
    Filed: October 11, 2010
    Publication date: March 3, 2011
    Inventors: David W. Johnston, Gregory Zaslavsky, William George
  • Patent number: 7812533
    Abstract: A fluorescent lamp (10) includes a tubular member or envelope (12) having an arc generating and sustaining medium (15) therein. As known, the tubular envelope (12) is constructed of a suitable glass, for example lime glass. An electrode (14) is provided in each end of the tubular member (12) and a phosphor coating (16) is applied to the interior surface (18) of the tubular member (12). A mercury dispenser (20) is situated within the tubular member (12). The mercury dispenser (20) includes a body (21) composed of a material selected from the group consisting of glass and ceramic materials. The body (21) is provided with a bore (22). A first material (24) capable of wetting mercury coats the bore. In a preferred embodiment the first material (24) is silver having a thickness between 0.1? and 8?. A quantity of mercury (26) is deposited in the bore (22) in contact with the first material (24).
    Type: Grant
    Filed: November 9, 2007
    Date of Patent: October 12, 2010
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: David W. Johnston, William A. George, Richard S. Speer, Gregory Zaslavsky
  • Publication number: 20100079988
    Abstract: A light source (10) comprises a tubular glass heat pipe (12) having a given inside diameter ID. A tubular fiberglass wick (14) is positioned within the glass heat pipe (12). The fiberglass wick (14) has an outside diameter OD substantially equal to the given inside diameter ID and has a substantially centrally located open chamber (16) extending the length thereof. A quantity of an evaporable-condensable medium (17) is provided within the glass heat pipe (12) and a metal cap (18) selected from the group of glass-sealing metals and alloys is fixed to a proximal end (20) of the glass heat pipe (12). Heat dissipaters (22) are fixed to the distal end (24) of the heat pipe (12) and a light emitting diode (26) is fixed to the metal cap (18). Power conducting traces (28) are formed with the heat pipe (12) and are electrically connected to the light emitting diode (26). A lamp (40) can be formed with a plurality of the light sources (10).
    Type: Application
    Filed: September 30, 2008
    Publication date: April 1, 2010
    Inventors: David W. Johnston, Gregory Zaslavsky, Jeffrey J. Serre