Patents by Inventor Nadarajah Narendran

Nadarajah Narendran 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: 8960953
    Abstract: A light emitting apparatus has a light source for emitting a first light in a forward direction. A wavelength-converting layer is spaced apart from the light source and disposed in a path of the first light. The wavelength-converting layer is configured to absorb at least a portion of the first light and emit a second light. A reflective layer is configured to be reflective of at least the second light, and the wavelength-converting layer is disposed between the reflective layer and the light source.
    Type: Grant
    Filed: February 4, 2013
    Date of Patent: February 24, 2015
    Assignee: Rensselaer Polytechnic Institute
    Inventors: Nadarajah Narendran, Yimin Gu
  • Patent number: 8764225
    Abstract: An embodiment discloses a light-emitting apparatus including a light source for emitting a first light; a wavelength-converting layer, having a first arcuate shape, spaced apart from the light source, the wavelength-converting layer configured to absorb at least a portion of the first light and emit a second light; a transparent member disposed between the light source and the wavelength-converting layer; and a monolithic reflective layer having a second arcuate shape and configured to be reflective of at least the second light; wherein the wavelength-converting layer is positioned between the monolithic reflective layer and the light source, and the monolithic reflective layer is separated from the wavelength-converting layer by a space; and wherein the second light is configured to pass through the space before being reflected by the monolithic reflective layer.
    Type: Grant
    Filed: November 17, 2010
    Date of Patent: July 1, 2014
    Assignee: Rensselaer Polytechnic Institute
    Inventors: Nadarajah Narendran, Yimin Gu
  • Publication number: 20140168941
    Abstract: A scattered photon extraction light fixture includes an optic element having a first surface; a light source for emitting short wavelength radiation, the light source disposed opposite, perpendicular, or tangential to the first surface of the optic element; a wavelength-conversion material, disposed on the first surface of the optic element, for receiving and down converting at least some of the short wavelength radiation emitted by the light source and transferring a portion of the received and down converted radiation; and one or more reflectors positioned opposite the wavelength-conversion material. A scattered photon extraction light system includes a plurality of light emitting fixtures. One or more wavelength-conversion materials, in the embodiments of the present invention, are disposed remotely from the light source(s), and used to absorb radiation in one spectral region and emit radiation in another spectral region.
    Type: Application
    Filed: January 10, 2014
    Publication date: June 19, 2014
    Applicant: RENSSELAER POLYTECHNIC INSTITUTE
    Inventors: Nadarajah Narendran, Yimin Gu, Jean Paul Freyssinier, Yiting Zhu
  • Publication number: 20140151736
    Abstract: A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.
    Type: Application
    Filed: February 4, 2014
    Publication date: June 5, 2014
    Applicant: RENSSELAER POLYTECHNIC INSTITUTE
    Inventors: Nadarajah Narendran, Yimin Gu
  • Patent number: 8646927
    Abstract: A scattered photon extraction light fixture includes an optic element having a first surface; a light source for emitting short wavelength radiation, the light source disposed opposite, perpendicular, or tangential to the first surface of the optic element; a wavelength-conversion material, disposed on the first surface of the optic element, for receiving and down converting at least some of the short wavelength radiation emitted by the light source and transferring a portion of the received and down converted radiation; and one or more reflectors positioned opposite the wavelength-conversion material. A scattered photon extraction light system includes a plurality of light emitting fixtures. One or more wavelength-conversion materials, in the embodiments of the present invention, are disposed remotely from the light source(s), and used to absorb radiation in one spectral region and emit radiation in another spectral region.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: February 11, 2014
    Assignee: Rensselaer Polytechnic Institute
    Inventors: Nadarajah Narendran, Yimin Gu, Jean Paul Freyssinier, Yiting Zhu
  • Publication number: 20130100659
    Abstract: A scattered photon extraction light fixture includes an optic element having a first surface; a light source for emitting short wavelength radiation, the light source disposed opposite, perpendicular, or tangential to the first surface of the optic element; a wavelength-conversion material, disposed on the first surface of the optic element, for receiving and down converting at least some of the short wavelength radiation emitted by the light source and transferring a portion of the received and down converted radiation; and one or more reflectors positioned opposite the wavelength-conversion material. A scattered photon extraction light system includes a plurality of light emitting fixtures. One or more wavelength-conversion materials, in the embodiments of the present invention, are disposed remotely from the light source(s), and used to absorb radiation in one spectral region and emit radiation in another spectral region.
    Type: Application
    Filed: March 11, 2011
    Publication date: April 25, 2013
    Applicant: RENSSELAER POLYTECHNIC INSTITUTE
    Inventors: Nadarajah Narendran, Yimin Gu, Jean Paul Freyssinier, Yiting Zhu
  • Patent number: 8292468
    Abstract: A light emitting apparatus includes a lamp base, a light-transmissive bulb envelope, a light source for emitting light, and a heat sink coupled to the light source. A solid state LED light bulb may further include a down conversion material. The down conversion material is disposed within the bulb envelope, remote from the light source and between the light source and the lamp base. The heat sink may include at least one metal fin and, additionally or alternatively, include a mesh disposed over at least an outer portion of the bulb envelope. A solid state light bulb may include a light guide for directing the light emitted by the light source. The solid state light bulb configurations place the light source and heat sink at the apex of the light bulb envelope, distant from the lamp base, in order to dissipate heat produced by the light source into the environment. In addition, at least part of the heat sink is outside the light bulb envelope to maximize the heat dissipation.
    Type: Grant
    Filed: June 9, 2010
    Date of Patent: October 23, 2012
    Assignee: Rensselaer Polytechnic Institute
    Inventors: Nadarajah Narendran, Jean Paul Freyssinier, Yiting Zhu
  • Publication number: 20120218624
    Abstract: A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.
    Type: Application
    Filed: April 23, 2012
    Publication date: August 30, 2012
    Applicant: Rensselaer Polytechnic Institute
    Inventors: Nadarajah Narendran, Yimin Gu
  • Patent number: 8164825
    Abstract: A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.
    Type: Grant
    Filed: January 10, 2011
    Date of Patent: April 24, 2012
    Assignee: Rensselaer Polytechnic Institute
    Inventors: Nadarajah Narendran, Yimin Gu
  • Publication number: 20120081880
    Abstract: A light emitting apparatus includes a lamp base, a light-transmissive bulb envelope, a light source for emitting light, and a heat sink coupled to the light source. A solid state LED light bulb may further include a down conversion material. The down conversion material is disposed within the bulb envelope, remote from the light source and between the light source and the lamp base. The heat sink may include at least one metal fin and, additionally or alternatively, include a mesh disposed over at least an outer portion of the bulb envelope. A solid state light bulb may include a light guide for directing the light emitted by the light source. The solid state light bulb configurations place the light source and heat sink at the apex of the light bulb envelope, distant from the lamp base, in order to dissipate heat produced by the light source into the environment. In addition, at least part of the heat sink is outside the light bulb envelope to maximize the heat dissipation.
    Type: Application
    Filed: June 9, 2010
    Publication date: April 5, 2012
    Applicant: Rensselaer Polytechnic Institute
    Inventors: Nadarajah Narendran, Jean Paul Freyssinier, Yiting Zhu
  • Patent number: 8031393
    Abstract: A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.
    Type: Grant
    Filed: January 10, 2011
    Date of Patent: October 4, 2011
    Assignee: Renesselaer Polytechnic Institute
    Inventors: Nadarajah Narendran, Yimin Gu
  • Publication number: 20110102884
    Abstract: A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.
    Type: Application
    Filed: January 10, 2011
    Publication date: May 5, 2011
    Applicant: Rensselaer Polytechnic Institute
    Inventors: Nadarajah Narendran, Yimin Gu
  • Publication number: 20110102883
    Abstract: A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.
    Type: Application
    Filed: January 10, 2011
    Publication date: May 5, 2011
    Applicant: Rensselaer Polytechnic Institute
    Inventors: Nadarajah Narendran, Yimin Gu
  • Publication number: 20110063830
    Abstract: A light emitting apparatus has a light source for emitting a first light in a forward direction. A wavelength-converting layer is spaced apart from the light source and disposed in a path of the first light. The wavelength-converting layer is configured to absorb at least a portion of the first light and emit a second light. A reflective layer is configured to be reflective of at least the second light, and the wavelength-converting layer is disposed between the reflective layer and the light source.
    Type: Application
    Filed: November 17, 2010
    Publication date: March 17, 2011
    Applicant: RENSSELAER POLYTECHNIC INSTITUTE
    Inventors: Nadarajah Narendran, Yimin Gu
  • Patent number: 7889421
    Abstract: A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: February 15, 2011
    Assignee: Rensselaer Polytechnic Institute
    Inventors: Nadarajah Narendran, Yimin Gu
  • Patent number: 7837348
    Abstract: A light emitting apparatus has a radiation source for emitting multi-colored radiation. A diffuser material receives at least a portion of the multi-colored radiation emitted by the radiation source and converts the multi-colored radiation into forward transferred radiation and back transferred radiation. An optic device is coupled to the diffuser material and is adapted to receive the back transferred radiation and extract at least a portion of the back transferred radiation from the optic device.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: November 23, 2010
    Assignee: Rensselaer Polytechnic Institute
    Inventors: Nadarajah Narendran, Yimin Gu
  • Patent number: 7819549
    Abstract: A light emitting apparatus includes a source of light for emitting light; a down conversion material receiving the emitted light, and converting the emitted light into transmitted light and backward transmitted light; and an optic device configured to receive the backward transmitted light and transfer the backward transmitted light outside of the optic device. The source of light is a semiconductor light emitting diode, a laser diode (LD), or a resonant cavity light emitting diode (RCLED). The down conversion material includes one of phosphor or other material for absorbing light in one spectral region and emitting light in another spectral region. The optic device, or lens, includes light transmissive material.
    Type: Grant
    Filed: May 5, 2005
    Date of Patent: October 26, 2010
    Assignee: Rensselaer Polytechnic Institute
    Inventors: Nadarajah Narendran, Yimin Gu, Jean Paul Freyssinier
  • Patent number: 7750359
    Abstract: A broad bandwidth light source including: a solid state light emitting device that generates short wavelength light; and quantum dot material and phosphor material that are each irradiated by some of the short wavelength light. The short wavelength light has a spectrum with a first peak wavelength shorter than about 500 nm. The quantum dot material absorbs some of the short wavelength light and reemits it as long wavelength light having a spectrum with a second peak wavelength longer than about 600 nm. The phosphor material absorbs some of the short wavelength light and reemits it as mid wavelength light having a spectrum with a peak wavelength between the first and second peak wavelength. The light source is configured such that some of each light (short, mid, and long wavelength) is emitted coincidentally as a light having a chromaticity value near the blackbody locus and a color rendering index greater than 80.
    Type: Grant
    Filed: June 20, 2006
    Date of Patent: July 6, 2010
    Assignee: Rensselaer Polytechnic Institute
    Inventors: Nadarajah Narendran, Yimin Gu
  • Patent number: 7703942
    Abstract: A light emitting apparatus having a light source for emitting short wavelength radiation and an optic device configured to receive the radiation emitted from the light source. A device directs at least some of the short wavelength radiation emitted from the light source into the optic device and a down conversion material receives at least some of the short wavelength radiation directed into the optic device in one spectral region and emits the radiation in another spectral region.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: April 27, 2010
    Assignee: Rensselaer Polytechnic Institute
    Inventors: Nadarajah Narendran, Jean Paul Freyssinier, Yimin Gu
  • Publication number: 20080117500
    Abstract: A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.
    Type: Application
    Filed: December 22, 2006
    Publication date: May 22, 2008
    Inventors: Nadarajah Narendran, Yimin Gu