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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Publication number: 20240255118Abstract: In an embodiment, there is provided an apparatus. The apparatus includes an optic configured for a selected illumination application. The optic includes a first lens structure and a second lens structure. The first lens structure includes a first planar external surface configured to receive incident light, and a first internal nonplanar refractive surface opposing the first planar external surface. The second lens structure includes a second planar external surface configured to emit output light, and a second internal nonplanar refractive surface opposing the second planar external surface. The second planar external surface opposes the first planar external surface. The first internal nonplanar refractive surface and the second internal nonplanar refractive surface define a cavity. The first internal nonplanar refractive surface, the second internal nonplanar refractive surface, and the cavity are positioned between the first planar external surface and the second planar external surface.Type: ApplicationFiled: February 1, 2024Publication date: August 1, 2024Applicant: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Akila Shan Udage
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Publication number: 20240247488Abstract: One embodiment provides a building material element. The building material element includes a three-dimensional (3D)-printed architectural element, and an integrated functional feature related to a functional element.Type: ApplicationFiled: May 27, 2022Publication date: July 25, 2024Applicant: RENSSELAER POLYTECHNIC INSTITUTEInventors: Nadarajah Narendran, Ukwatte Lokuliyanage Indika Perera, Jean Paul Freyssinier
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Publication number: 20240093856Abstract: One embodiment provides a lens structure. The lens structure includes a backend. The backend includes a backend back surface and a backend front surface. The backend is configured to receive a luminous flux from a light source and to redirect the received luminous flux onto a lens. The redirected luminous flux is configured to increase a luminous efficacy.Type: ApplicationFiled: January 26, 2022Publication date: March 21, 2024Applicant: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Akila Shan Udage
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Publication number: 20240085012Abstract: One embodiment provides a luminaire. The luminaire includes a light transfer structure, and a thermal management structure. The light transfer structure is configured to receive light from at least one light emitting diode (LED). The thermal management structure is configured to manage a thermal energy of the at least one LED. The light transfer structure and the thermal management structure are formed during a same three-dimensional (3D) printing process.Type: ApplicationFiled: January 19, 2022Publication date: March 14, 2024Applicant: RENSSELAER POLYTECHNIC INSTITUTEInventors: Nadarajah Narendran, Jean Paul Freyssinier, Ukwatte Lokuliyanage Indika Perera
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Patent number: 11725810Abstract: A heat sink for a luminaire includes a central portion having a top surface and a bottom surface. The bottom surface is adapted to receive a lighting arrangement. The heat sink further includes a plurality of arms configured to dissipate heat generated by the lighting arrangement. The plurality of arms extend radially outward from the central portion. Each one of the plurality of arms is substantially arcuate between a proximal end and a distal end.Type: GrantFiled: January 28, 2022Date of Patent: August 15, 2023Assignee: EATON INTELLIGENT POWER LIMITEDInventors: John Trublowski, Lucas Stahl, Jeremy Santiago, Christopher Ring, Adikaramge Jayawardena, Ukwatte Lokuliyanage Indika Upendra Perera, Nadarajah Narendran, Nilay Mehta, Jean Paul Freyssinier
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Publication number: 20220260243Abstract: A heat sink for a luminaire includes a central portion having a top surface and a bottom surface. The bottom surface is adapted to receive a lighting arrangement. The heat sink further includes a plurality of arms configured to dissipate heat generated by the lighting arrangement. The plurality of arms extend radially outward from the central portion. Each one of the plurality of arms is substantially arcuate between a proximal end and a distal end.Type: ApplicationFiled: January 28, 2022Publication date: August 18, 2022Inventors: John Trublowski, Lucas Stahl, Jeremy Santiago, Christopher Ring, Adikaramge Jayawardena, Ukwatte Lokuliyanage Indika Upendra Perera, Nadarajah Narendran, Nilay Mehta, Jean Paul Freyssinier
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Publication number: 20220229221Abstract: In an embodiment, there is provided a light guide for an edge-lit light panel. The light guide includes a first light coupling surface; a second light coupling surface; a first light output surface; and a second light output surface. The second light coupling surface opposes the first light coupling surface. The second light output surface opposes the first light output surface. The first light output surface and the second light output surface are coupled between the first light coupling surface and the second light coupling surface. Each light coupling surface is configured to receive incident light from a respective light source and to produce at least a portion of a batwing light beam inside the light guide. The at least a portion of the batwing light beam is concentrated adjacent the first light output surface, the first light output surface corresponding to a first light extraction surface.Type: ApplicationFiled: May 11, 2020Publication date: July 21, 2022Applicant: RENSSELAER POLYTECHNIC INSTITUTEInventors: Xi Mou, Nadarajah Narendran
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Publication number: 20220034482Abstract: In an embodiment, there is provided a three-dimensional (3-D) optic for beam shaping. The 3-D optic includes a first surface, a second surface and a beam forming feature. The first surface is configured to receive incident light. The second surface is positioned relative to the first surface and is configured to emit a light beam having a shape. The emitted beam shape is related to the beam forming feature. The beam forming feature is formed by a 3-D manufacturing process.Type: ApplicationFiled: December 13, 2019Publication date: February 3, 2022Applicant: RENSSELAER POLYTECHNIC INSTITUTEInventors: Nadarajah Narendran, Ukwatte Lokuliyanage Indika Upendra Perera
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Patent number: 11028979Abstract: A light-emitting apparatus includes a base, a first semiconductor radiation emitting diode, having a top surface and a side wall, disposed on the base, a transparent structure disposed on the base and surrounding the side wall and covering the top surface, and a phosphor structure placed within the transparent structure surrounding the side wall and covering the top surface. The first semiconductor radiation emitting diode has a width smaller than that of the base and is configured to emit a light which can be converted into a forward transferred down-converted radiation light and a back transferred down-converted radiation light by the phosphor structure. At least a portion of the forward transferred down-converted radiation light and the back transferred down-converted radiation light are emitted toward the base.Type: GrantFiled: September 19, 2016Date of Patent: June 8, 2021Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu
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Patent number: 10969272Abstract: Methods and systems for modulating a manufactured light source are disclosed. Methods and systems of the present disclosure include sensor assemblies having first and second light sensors to retrieve light spectrum data at a target location, such as from a surface in an interior space at a home, office, or commercial building, that also receives daylight exposure. The first light sensor retrieves the light spectrum data within a spectrum of the manufactured light source. The second light sensor retrieves light spectrum data outside of the spectrum of the manufactured light source, yet within the spectrum of daylight. The light spectrum data is used to define spectral characteristics at the target location, such as a ratio of daylight to the manufactured light source, phase of daylight, and average overall quantity, which are used to maximize light-associated benefits of the spectral composition for the occupants at the target location, such as humans, plants, and animals.Type: GrantFiled: May 2, 2017Date of Patent: April 6, 2021Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yiting Zhu, Jean Paul Freyssinier, Yi-Wei Liu, Dinusha Thotagamuwa
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Patent number: 10527258Abstract: A light fixture includes a light source, a wavelength-conversion material, and a reflector. The light source is configured to emit a first radiation, and has a front surface and a back surface. The wavelength-conversion material is arranged under the front surface and configured to convert the first radiation to a second radiation which has a first portion not able to reach the reflector and a second portion able to reach the reflector. The reflector is arranged over the back surface and configured to reflect the second portion away from the light source without passing through the wavelength-conversion material. The reflector has an end distant from the light source and is arranged in an elevation different from that of the wavelength-conversion material.Type: GrantFiled: August 28, 2017Date of Patent: January 7, 2020Assignee: RENSSELAER POLYTECHNIC INSTITUTEInventors: Nadarajah Narendran, Yimin Gu, Jean Paul Freyssinier, Yiting Zhu
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Patent number: 10305001Abstract: A light emitting apparatus includes a first radiation source without a dome, a substantially transparent and light transmissive optic device, a lens, a down conversion material, and a heat sink. The optic device is devoid of scattering particles and phosphor, and includes a planar top surface distal the first radiation source, a bottom surface proximal the first radiation sources, and a transparent sidewall extending between the top surface and the bottom surface. The down conversion material includes a flat layer including phosphor that is disposed on the planar top surface of the optic device between the lens and the radiation source. The heat sink, upon which the radiation source is mounted, has a recess formed therein in which an air space is defined between a boundary of the recess and the optic device.Type: GrantFiled: July 7, 2015Date of Patent: May 28, 2019Assignee: RENSSELAER POLYTECHNIC INSTITUTEInventors: Nadarajah Narendran, Yimin Gu
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Publication number: 20190094070Abstract: Methods and systems for modulating a manufactured light source are disclosed. Methods and systems of the present disclosure include sensor assemblies having first and second light sensors to retrieve light spectrum data at a target location, such as from a surface in an interior space at a home, office, or commercial building, that also receives daylight exposure. The first light sensor retrieves the light spectrum data within a spectrum of the manufactured light source. The second light sensor retrieves light spectrum data outside of the spectrum of the manufactured light source, yet within the spectrum of daylight. The light spectrum data is used to define spectral characteristics at the target location, such as a ratio of daylight to the manufactured light source, phase of daylight, and average overall quantity, which are used to maximize light-associated benefits of the spectral composition for the occupants at the target location, such as humans, plants, and animals.Type: ApplicationFiled: May 2, 2017Publication date: March 28, 2019Applicant: RENSSELAER POLYTECHNIC INSTITUTEInventors: Nadarajah NARENDRAN, Yiting ZHU, Jean Paul FREYSSINIER, Yi-Wei LIU, Dinusha THOTAGAMUWA
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Publication number: 20170356603Abstract: A light fixture includes a light source, a wavelength-conversion material, and a reflector. The light source is configured to emit a first radiation, and has a front surface and a back surface. The wavelength-conversion material is arranged under the front surface and configured to convert the first radiation to a second radiation which has a first portion not able to reach the reflector and a second portion able to reach the reflector. The reflector is arranged over the back surface and configured to reflect the second portion away from the light source without passing through the wavelength-conversion material. The reflector has an end distant from the light source and is arranged in an elevation different from that of the wavelength-conversion material.Type: ApplicationFiled: August 28, 2017Publication date: December 14, 2017Inventors: Nadarajah NARENDRAN, Yimin GU, Jean Paul FREYSSINIER, Yiting ZHU
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Patent number: 9746142Abstract: A light fixture includes a light source, a wavelength-conversion material, and a reflector. The light source is configured to emit a first radiation, and has a front surface and a back surface. The wavelength-conversion material is arranged under the front surface and configured to convert the first radiation to a second radiation which has a first portion not able to reach the reflector and a second portion able to reach the reflector. The reflector is arranged over the back surface and configured to reflect the second portion away from the light source without passing through the wavelength-conversion material. The reflector has an end distant from the light source and is arranged in an elevation different from that of the wavelength-conversion material.Type: GrantFiled: July 7, 2015Date of Patent: August 29, 2017Assignee: RENSSELAER POLYTECHNIC INSTITUTEInventors: Nadarajah Narendran, Yimin Gu, Jean Paul Freyssinier, Yiting Zhu
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Publication number: 20170003000Abstract: A light-emitting apparatus includes a base, a first semiconductor radiation emitting diode, having a top surface and a side wall, disposed on the base, a transparent structure disposed on the base and surrounding the side wall and covering the top surface, and a phosphor structure placed within the transparent structure surrounding the side wall and covering the top surface. The first semiconductor radiation emitting diode has a width smaller than that of the base and is configured to emit a light which can be converted into a forward transferred down-converted radiation light and a back transferred down-converted radiation light by the phosphor structure. At least a portion of the forward transferred down-converted radiation light and the back transferred down-converted radiation light are emitted toward the base.Type: ApplicationFiled: September 19, 2016Publication date: January 5, 2017Inventors: Nadarajah Narendran, Yimin Gu
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Patent number: 9447945Abstract: A light-emitting apparatus includes a substrate, a light source configured to emit light and arranged on the substrate, a phosphor layer being apart from the light source and configured to convert the light into forward transmitted light and backward transmitted light, and an optic device, being narrower than the substrate and having a transparent side wall, configured to direct at least a portion of the backward transmitted light through the transparent side wall and toward the substrate. In another aspect, a light-emitting apparatus includes a transparent base, a light source on the transparent base, a transparent material covering the light source, a phosphor layer on the transparent material, and a transparent wall on the phosphor layer.Type: GrantFiled: January 9, 2015Date of Patent: September 20, 2016Assignee: RENSSELAER POLYTECHNIC INSTITUTEInventors: Nadarajah Narendran, Yimin Gu
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Publication number: 20150325754Abstract: A light emitting apparatus includes a first radiation source without a dome, a substantially transparent and light transmissive optic device, a lens, a down conversion material, and a heat sink. The optic device is devoid of scattering particles and phosphor, and includes a planar top surface distal the first radiation source, a bottom surface proximal the first radiation sources, and a transparent sidewall extending between the top surface and the bottom surface. The down conversion material includes a flat layer including phosphor that is disposed on the planar top surface of the optic device between the lens and the radiation source. The heat sink, upon which the radiation source is mounted, has a recess formed therein in which an air space is defined between a boundary of the recess and the optic device.Type: ApplicationFiled: July 7, 2015Publication date: November 12, 2015Inventors: Nadarajah Narendran, Yimin Gu
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Publication number: 20150308638Abstract: A light fixture includes a light source, a wavelength-conversion material, and a reflector. The light source is configured to emit a first radiation, and has a front surface and a back surface. The wavelength-conversion material is arranged under the front surface and configured to convert the first radiation to a second radiation which has a first portion not able to reach the reflector and a second portion able to reach the reflector. The reflector is arranged over the back surface and configured to reflect the second portion away from the light source without passing through the wavelength-conversion material. The reflector has an end distant from the light source and is arranged in an elevation different from that of the wavelength-conversion material.Type: ApplicationFiled: July 7, 2015Publication date: October 29, 2015Inventors: Nadarajah Narendran, Yimin Gu, Jean Paul Freyssinier, Yiting Zhu
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Patent number: 9105816Abstract: A light emitting apparatus has a first radiation source without a dome, a substantially transparent and light transmissive optic device devoid of scattering particles and phosphor, a lens, a down conversion material containing phosphor that is disposed on the planar top surface of the optic device between the lens and the radiation source, and a heat sink, upon which the radiation source is mounted, having a recess formed therein in which the radiation source, the optic device and the down conversion material are positioned, wherein an air space is defined between a boundary of the recess and the optic device.Type: GrantFiled: February 4, 2014Date of Patent: August 11, 2015Assignee: Rensselaer Polytechnic InstituteInventors: Nadarajah Narendran, Yimin Gu