Patents by Inventor Sridhar Sadasivan

Sridhar Sadasivan 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: 10222532
    Abstract: A light mixing chamber includes a housing having a channel formed therein, with the channel exposed to an exterior of the housing. A chamber is formed in the housing, and an aperture formed in the housing connects the chamber to the channel. The chamber may house an LED, with an optical member being retained within the channel. A light guide plate may be positioned on an exterior of the housing outside the channel.
    Type: Grant
    Filed: July 10, 2014
    Date of Patent: March 5, 2019
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Warren Pumyea, Sridhar Sadasivan, Suchit Shah
  • Patent number: 10197227
    Abstract: An illumination device including a light source positioned at the distal end of a reflecting unit and a heat sink light transmissive substrate including quantum dots positioned at the proximal end of the reflecting unit with the reflecting unit having one or more reflecting side walls and a reflecting bottom wall and with the light source being separated a distance from the light transmissive substrate including quantum dots. In certain embodiments, the light source is an LED.
    Type: Grant
    Filed: June 21, 2013
    Date of Patent: February 5, 2019
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Ryan C. Williamson, Sridhar Sadasivan
  • Patent number: 10145539
    Abstract: A solid state lighting device including a light source capable of emitting white light including a blue spectral component and having a deficiency in a spectral region, and an optical component that is positioned to receive at least a portion of the light generated by the light source, the optical component comprising an optical material for converting at least a portion of the blue spectral component of the light to one or more predetermined wavelengths such that light emitted by the solid state lighting device includes light emission from the light source supplemented with light emission at one or more predetermined wavelengths, wherein the optical material comprises quantum confined semiconductor nanoparticles. Also disclosed is lighting fixture, a cover plate for a lighting fixture and a method.
    Type: Grant
    Filed: October 19, 2015
    Date of Patent: December 4, 2018
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Seth Coe-Sullivan, John R. Linton, Sridhar Sadasivan, Emily M. Squires, Moungi G. Bawendi
  • Patent number: 10012778
    Abstract: A glass tube including quantum dots in a polymerized matrix is described. An optical component and other products including such glass tube, a composition including quantum dots, and methods are also disclosed.
    Type: Grant
    Filed: January 4, 2018
    Date of Patent: July 3, 2018
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Robert J. Nick, Sridhar Sadasivan, John R. Linton
  • Publication number: 20180128955
    Abstract: A glass tube including quantum dots in a polymerized matrix is described. An optical component and other products including such glass tube, a composition including quantum dots, and methods are also disclosed.
    Type: Application
    Filed: January 4, 2018
    Publication date: May 10, 2018
    Inventors: ROBERT J. NICK, SRIDHAR SADASIVAN, JOHN R. LINTON
  • Publication number: 20180122613
    Abstract: Systems and methods are described that relate to quantum dot (QD) structures for lighting applications. In particular, quantum dots and quantum dot containing inks (comprising mixtures of different wavelength quantum dots) are synthesized for desired optical properties and integrated with an LED source to create a trichromatic white light source. The LED source may be integrated with the quantum dots in a variety of ways, including through the use of a small capillary filled with quantum dot containing ink or a quantum dot containing film placed appropriately within the optical system. These systems may result in improved displays characterized by higher color gamuts, lower power consumption, and reduced cost.
    Type: Application
    Filed: December 29, 2017
    Publication date: May 3, 2018
    Inventors: Sridhar SADASIVAN, John R. LINTON, David R. GILDEA, Seth COE-SULLIVAN, Suchit SHAH, Robert J. NICK
  • Patent number: 9864121
    Abstract: A glass tube including quantum dots in a polymerized matrix is described. An optical component and other products including such glass tube, a composition including quantum dots, and methods are also disclosed.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: January 9, 2018
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Robert J. Nick, Sridhar Sadasivan, John R. Linton
  • Patent number: 9851497
    Abstract: A light mixing chamber of a backlight includes a housing having a channel and a chamber exposed to the channel, an LED positioned within the chamber, and a capillary containing quantum dots positioned in the channel. A light guide plate is positioned adjacent the housing and adjacent the capillary. Relative dimensions of the elements of the light mixing chamber, as well as features added to the elements of the light mixing chamber, can be varied to balance efficiency and uniformity of light generated in the backlight.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: December 26, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Sridhar Sadasivan, Karen Twietmeyer, Warren P. Pumyea, Victoria K. Hinchey
  • Publication number: 20160209002
    Abstract: A solid state lighting device including a light source capable of emitting white light including a blue spectral component and having a deficiency in a spectral region, and an optical component that is positioned to receive at least a portion of the light generated by the light source, the optical component comprising an optical material for converting at least a portion of the blue spectral component of the light to one or more predetermined wavelengths such that light emitted by the solid state lighting device includes light emission from the light source supplemented with light emission at one or more predetermined wavelengths, wherein the optical material comprises quantum confined semiconductor nanoparticles. Also disclosed is lighting fixture, a cover plate for a lighting fixture and a method.
    Type: Application
    Filed: October 19, 2015
    Publication date: July 21, 2016
    Inventors: SETH COE-SULLIVAN, JOHN R. LINTON, SRIDHAR SADASIVAN, EMILY M. SQUIRES, MOUNGI G. BAWENDI
  • Publication number: 20150362654
    Abstract: A light mixing chamber of a backlight includes a housing having a channel and a chamber exposed to the channel, an LED positioned within the chamber, and a capillary containing quantum dots positioned in the channel. A light guide plate is positioned adjacent the housing and adjacent the capillary. Relative dimensions of the elements of the light mixing chamber, as well as features added to the elements of the light mixing chamber, can be varied to balance efficiency and uniformity of light generated in the backlight.
    Type: Application
    Filed: June 11, 2015
    Publication date: December 17, 2015
    Inventors: SRIDHAR SADASIVAN, KAREN TWIETMEYER, WARREN P. PUMYEA, VICTORIA K. HINCHEY
  • Patent number: 9167659
    Abstract: A solid state lighting device including a light source capable of emitting white light including a blue spectral component and having a deficiency in a spectral region, and an optical component that is positioned to receive at least a portion of the light generated by the light source, the optical component comprising an optical material for converting at least a portion of the blue spectral component of the light to one or more predetermined wavelengths such that light emitted by the solid state lighting device includes light emission from the light source supplemented with light emission at one or more predetermined wavelengths, wherein the optical material comprises quantum confined semiconductor nanoparticles. Also disclosed is lighting fixture, a cover plate for a lighting fixture and a method.
    Type: Grant
    Filed: November 5, 2010
    Date of Patent: October 20, 2015
    Assignee: QD VISION, INC.
    Inventors: Seth Coe-Sullivan, John R. Linton, Sridhar Sadasivan, Emily M. Squires
  • Publication number: 20150009686
    Abstract: A light mixing chamber includes a housing having a channel formed therein, with the channel exposed to an exterior of the housing. A chamber is formed in the housing, and an aperture formed in the housing connects the chamber to the channel. The chamber may house an LED, with an optical member being retained within the channel. A light guide plate may be positioned on an exterior of the housing outside the channel.
    Type: Application
    Filed: July 10, 2014
    Publication date: January 8, 2015
    Inventors: WARREN PUMYEA, SRIDHAR SADASIVAN, SUCHIT SHAH
  • Publication number: 20140027673
    Abstract: A quantum dot formulation substantially free of oxygen and, optionally, substantially free of water and a method of making a quantum dot formulation substantially free of oxygen and, optionally, substantially free of water is described. Also described are products including the quantum dot formulation described herein and related methods.
    Type: Application
    Filed: February 7, 2013
    Publication date: January 30, 2014
    Applicant: QD VISION, INC.
    Inventors: Robert J. NICK, Craig Alan BREEN, Chad M. DENTON, Sridhar SADASIVAN, John R. LINTON
  • Publication number: 20130277643
    Abstract: An illumination device including a light source positioned at the distal end of a reflecting unit and a heat sink light transmissive substrate including quantum dots positioned at the proximal end of the reflecting unit with the reflecting unit having one or more reflecting side walls and a reflecting bottom wall and with the light source being separated a distance from the light transmissive substrate including quantum dots. In certain embodiments, the light source is an LED.
    Type: Application
    Filed: June 21, 2013
    Publication date: October 24, 2013
    Inventors: Ryan C. WILLIAMSON, Sridhar SADASIVAN
  • Publication number: 20120113671
    Abstract: Systems and methods are described that relate to quantum dot (QD) structures for lighting applications. In particular, quantum dots and quantum dot containing inks (comprising mixtures of different wavelength quantum dots) are synthesized for desired optical properties and integrated with an LED source to create a trichromatic white light source. The LED source may be integrated with the quantum dots in a variety of ways, including through the use of a small capillary filled with quantum dot containing ink or a quantum dot containing film placed appropriately within the optical system. These systems may result in improved displays characterized by higher color gamuts, lower power consumption, and reduced cost.
    Type: Application
    Filed: August 9, 2011
    Publication date: May 10, 2012
    Inventors: SRIDHAR SADASIVAN, John R. Linton, David R. Gildea, Seth Coe-Sullivan, Suchit Shah, Robert J. Nick
  • Publication number: 20110103064
    Abstract: A solid state lighting device including a light source capable of emitting white light including a blue spectral component and having a deficiency in a spectral region, and an optical component that is positioned to receive at least a portion of the light generated by the light source, the optical component comprising an optical material for converting at least a portion of the blue spectral component of the light to one or more predetermined wavelengths such that light emitted by the solid state lighting device includes light emission from the light source supplemented with light emission at one or more predetermined wavelengths, wherein the optical material comprises quantum confined semiconductor nanoparticles. Also disclosed is lighting fixture, a cover plate for a lighting fixture and a method.
    Type: Application
    Filed: November 5, 2010
    Publication date: May 5, 2011
    Inventors: SETH COE-SULLIVAN, John R. Linton, Sridhar Sadasivan, Emily M. Squires
  • Patent number: 7901748
    Abstract: An ink jet recording element with a support having thereon an image-receiving layer of inorganic particles and stabilizer particles, the stabilizer particles being free of any organic solvent and containing greater than about 80% by weight of a water-insoluble antioxidant and having a mean particle size of greater than 5 nm, the inorganic particles being greater than about 50% by weight of the ink receiving layer.
    Type: Grant
    Filed: December 12, 2001
    Date of Patent: March 8, 2011
    Assignee: Eastman Kodak Company
    Inventors: Yongcai Wang, Kurt M. Schroeder, Lori J. Shaw-Klein, Thomas P. Nicholas, Sridhar Sadasivan, Christine M. Vargas
  • Patent number: 7413286
    Abstract: A method and apparatus for delivering solvent free marking material to a receiver is provided. A printhead includes a discharge device having an inlet and an outlet with a portion of the discharge device defining a delivery path. An actuating mechanism is moveably positioned along the delivery path. A material selection device has an inlet and an outlet with the outlet of the material selection device being connected in fluid communication to the inlet of the discharge device. The inlet of the material selection device is adapted to be connected to a pressurized source of a thermodynamically stable mixture of a fluid and a marking material, wherein the fluid is in a gaseous state at a location beyond the outlet of the discharge device.
    Type: Grant
    Filed: September 8, 2005
    Date of Patent: August 19, 2008
    Assignee: Eastman Kodak Company
    Inventors: Sridhar Sadasivan, Seshadri Jagannathan, Suresh Sunderrajan, Gary E. Merz, John E. Rueping, Glen C. Irvin, Jr., Ramesh Jagannathan, Rajesh V. Mehta, David J. Nelson
  • Patent number: 7273643
    Abstract: An article having multiple spectral deposits is provided. The article can include a support and a single nanomorphic marking material adapted to reflect light having a first spectral content and adapted to reflect light having a second spectral content. The article can include a support and a nanomorphic marking material held by the support that luminesces at a plurality of wavelengths. The article can include a support and marking material having a first particle size and a second particle size. The first particle size reflects a first spectrum and the second particle size reflects a second spectrum. The article can include a support and a marking material held by said support with the marking material including a nanocrystalline particulate having a measurable property non-characteristic of the same marking material in a bulk state.
    Type: Grant
    Filed: June 24, 2003
    Date of Patent: September 25, 2007
    Assignee: Eastman Kodak Company
    Inventors: David J. Nelson, Sridhar Sadasivan, Ramesh Jagannathan, Seshadri Jagannathan, Glen C. Irvin, Jr., Rajesh V. Mehta
  • Patent number: 7160573
    Abstract: A method of forming a color filter is provided. The method includes providing a mixture of a color filter material and a compressed fluid; providing at least a partially controlled environment for retaining a substrate, the at least partially controlled environment being in fluid communication with the mixture of the color filter material and the compressed fluid; providing a shadow mask in close proximity to the substrate retained in the at least partially controlled environment; and chargably releasing the mixture of the color filter material and the compressed fluid into the at least partially controlled environment, wherein the color filter material becomes free of the compressed fluid prior to contacting the substrate at locations defined by the shadow mask thereby forming a patterned deposition on the substrate.
    Type: Grant
    Filed: June 12, 2003
    Date of Patent: January 9, 2007
    Assignee: Eastman Kodak Company
    Inventors: Sridhar Sadasivan, Ramesh Jagannathan, Seshadri Jagannathan, Rajesh Mehta, David J. Nelson, Glen C. Irvin, Jr.