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).
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Patent number: 8960953Abstract: 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: GrantFiled: February 4, 2013Date of Patent: February 24, 2015Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Patent number: 8764225Abstract: 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: GrantFiled: November 17, 2010Date of Patent: July 1, 2014Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Publication number: 20140168941Abstract: 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: ApplicationFiled: January 10, 2014Publication date: June 19, 2014Applicant: RENSSELAER POLYTECHNIC INSTITUTEInventors: Nadarajah Narendran, Yimin Gu, Jean Paul Freyssinier, Yiting Zhu
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Publication number: 20140151736Abstract: 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: ApplicationFiled: February 4, 2014Publication date: June 5, 2014Applicant: RENSSELAER POLYTECHNIC INSTITUTEInventors: Nadarajah Narendran, Yimin Gu
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Patent number: 8646927Abstract: 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: GrantFiled: March 11, 2011Date of Patent: February 11, 2014Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu, Jean Paul Freyssinier, Yiting Zhu
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Publication number: 20130100659Abstract: 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: ApplicationFiled: March 11, 2011Publication date: April 25, 2013Applicant: RENSSELAER POLYTECHNIC INSTITUTEInventors: Nadarajah Narendran, Yimin Gu, Jean Paul Freyssinier, Yiting Zhu
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Patent number: 8292468Abstract: 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: GrantFiled: June 9, 2010Date of Patent: October 23, 2012Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Jean Paul Freyssinier, Yiting Zhu
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Publication number: 20120218624Abstract: 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: ApplicationFiled: April 23, 2012Publication date: August 30, 2012Applicant: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Patent number: 8164825Abstract: 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: GrantFiled: January 10, 2011Date of Patent: April 24, 2012Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Publication number: 20120081880Abstract: 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: ApplicationFiled: June 9, 2010Publication date: April 5, 2012Applicant: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Jean Paul Freyssinier, Yiting Zhu
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Patent number: 8031393Abstract: 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: GrantFiled: January 10, 2011Date of Patent: October 4, 2011Assignee: Renesselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Publication number: 20110102884Abstract: 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: ApplicationFiled: January 10, 2011Publication date: May 5, 2011Applicant: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Publication number: 20110102883Abstract: 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: ApplicationFiled: January 10, 2011Publication date: May 5, 2011Applicant: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Publication number: 20110063830Abstract: 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: ApplicationFiled: November 17, 2010Publication date: March 17, 2011Applicant: RENSSELAER POLYTECHNIC INSTITUTEInventors: Nadarajah Narendran, Yimin Gu
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Patent number: 7889421Abstract: 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: GrantFiled: December 22, 2006Date of Patent: February 15, 2011Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Patent number: 7837348Abstract: 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: GrantFiled: December 20, 2006Date of Patent: November 23, 2010Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Patent number: 7819549Abstract: 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: GrantFiled: May 5, 2005Date of Patent: October 26, 2010Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu, Jean Paul Freyssinier
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Patent number: 7750359Abstract: 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: GrantFiled: June 20, 2006Date of Patent: July 6, 2010Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Patent number: 7703942Abstract: 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: GrantFiled: December 20, 2006Date of Patent: April 27, 2010Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Jean Paul Freyssinier, Yimin Gu
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Publication number: 20080117500Abstract: 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: ApplicationFiled: December 22, 2006Publication date: May 22, 2008Inventors: Nadarajah Narendran, Yimin Gu