Patents by Inventor Ashfaqul I. Chowdhury
Ashfaqul I. Chowdhury 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: 10833228Abstract: Aspects of the present disclosure are directed to a composite light source which includes at least one blue light source having peak wavelength in the range of about 400 nm to about 460 nm; at least one yellow-green garnet phosphor; and at least one narrow-band red-emitting down-converter. Such composite light source may have a Lighting Preference Index (LPI) of at least 120. In other aspects the disclosure is directed to composite light source comprising at least one blue light source having peak wavelength in the range of about 400 nm to about 460 nm; at least one yellow-green garnet phosphor; and at least one broad red down-converter. In this latter aspect the composite light source may have a Lighting Preference Index (LPI) of at least 120. Numerous other aspects are provided.Type: GrantFiled: August 12, 2019Date of Patent: November 10, 2020Assignee: Consumer Lighting (U.S.), LLCInventors: Kevin James Vick, Gary Robert Allen, Ashfaqul I. Chowdhury
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Publication number: 20200083407Abstract: Aspects of the present disclosure are directed to a composite light source which includes at least one blue light source having peak wavelength in the range of about 400 nm to about 460 nm; at least one yellow-green garnet phosphor; and at least one narrow-band red-emitting down-converter. Such composite light source may have a Lighting Preference Index (LPI) of at least 120. In other aspects the disclosure is directed to composite light source comprising at least one blue light source having peak wavelength in the range of about 400 nm to about 460 nm; at least one yellow-green garnet phosphor; and at least one broad red down-converter. In this latter aspect the composite light source may have a Lighting Preference Index (LPI) of at least 120. Numerous other aspects are provided.Type: ApplicationFiled: August 12, 2019Publication date: March 12, 2020Applicant: Consumer Lighting, LLCInventors: Kevin James Vick, Gary Robert Allen, Ashfaqul I. Chowdhury
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Patent number: 10495263Abstract: An overcoated LED filament includes an LED filament comprising one or more LED dies coated with an underlying layer of a phosphor material exhibiting a colored appearance, and an over-coated layer comprising a resinous material loaded with a scattering agent that causes the LED filament to appear white.Type: GrantFiled: March 15, 2018Date of Patent: December 3, 2019Assignee: Consumer Lighting (U.S.), LLCInventors: Ashfaqul I. Chowdhury, Tomislav Josip Stimac, Kevin Jeffrey Benner, James William Firis
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Patent number: 10381527Abstract: Aspects of the present disclosure are directed to a composite light source which includes at least one blue light source having peak wavelength in the range of about 400 nm to about 460 nm; at least one yellow-green garnet phosphor; and at least one narrow-band red-emitting down-converter. Such composite light source may have a Lighting Preference Index (LPI) of at least 120. In other aspects the disclosure is directed to composite light source comprising at least one blue light source having peak wavelength in the range of about 400 nm to about 460 nm; at least one yellow-green garnet phosphor; and at least one broad red down-converter. In this latter aspect the composite light source may have a Lighting Preference Index (LPI) of at least 120. Numerous other aspects are provided.Type: GrantFiled: March 8, 2017Date of Patent: August 13, 2019Assignee: Consumer Lighting, LLCInventors: Kevin James Vick, Gary Robert Allen, Ashfaqul I. Chowdhury
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Patent number: 10359158Abstract: A lighting selection system and method obtain individualized characteristic data for each of plural light emitting devices, determine a difference between a value of the characteristic data and a designated target value for each of the light emitting devices, and group the light emitting devices into different groups based on the differences between the values of the characteristic data and the designated target value. The differences of the light emitting devices in a common group of the groups are closer together than the differences of the light emitting devices in other groups of the groups. The system and method also may select at least one of the groups of the light emitting devices for inclusion in a light device.Type: GrantFiled: September 15, 2016Date of Patent: July 23, 2019Assignee: CURRENT LIGHTING SOLUTIONS, LLCInventors: Ashfaqul I. Chowdhury, Kevin Jeffrey Benner
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Publication number: 20190128481Abstract: An overcoated LED filament includes an LED filament comprising one or more LED dies coated with an underlying layer of a phosphor material exhibiting a colored appearance, and an over-coated layer comprising a resinous material loaded with a scattering agent that causes the LED filament to appear white.Type: ApplicationFiled: March 15, 2018Publication date: May 2, 2019Inventors: Ashfaqul I. CHOWDHURY, Tomislav Josip STIMAC, Kevin Jeffrey Benner, James William FIRIS
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Patent number: 10240772Abstract: A heat sink comprises a heat sink body, which in some embodiments is a plastic heat sink body, and a thermally conductive layer disposed over the heat sink body. In some embodiments the thermally conductive layer comprises a copper layer. A light emitting diode (LED)-based lamp comprises the aforementioned heat sink and an LED module including one or more LED devices in which the LED module is secured with and in thermal communication with the heat sink. Some such LED-based lamps may have an A-line bulb configuration or an MR or PAR configuration. Disclosed method embodiments comprise forming a heat sink body and disposing a thermally conductive layer on the heat sink body. The forming may comprise molding the heat sink body, which may be plastic. In some method embodiments the heat sink body includes fins and the disposing includes disposing the thermally conductive layer over the fins.Type: GrantFiled: December 28, 2010Date of Patent: March 26, 2019Assignee: GE Lighting Solutions, LLCInventors: Ashfaqul I. Chowdhury, Gary R. Allen, Thomas A. Knapp
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Patent number: 9974138Abstract: Composite light sources and methods use a low-blue component light source emitting first substantially white light and a high-blue component light source emitting second substantially white light. The second substantially white light has a greater correlated color temperature than the first substantially white light. The first and second substantially white light combine to provide substantially intermediate warm-white light.Type: GrantFiled: December 24, 2015Date of Patent: May 15, 2018Assignee: GE LIGHTING SOLUTIONS, LLCInventors: Gary Robert Allen, Ashfaqul I. Chowdhury, David C. Dudik, Kevin James Vick, Thomas J. Boyle
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Publication number: 20180130928Abstract: Aspects of the present disclosure are directed to a composite light source which includes at least one blue light source having peak wavelength in the range of about 400 nm to about 460 nm; at least one yellow-green garnet phosphor; and at least one narrow-band red-emitting down-converter. Such composite light source may have a Lighting Preference Index (LPI) of at least 120. In other aspects the disclosure is directed to composite light source comprising at least one blue light source having peak wavelength in the range of about 400 nm to about 460 nm; at least one yellow-green garnet phosphor; and at least one broad red down-converter. In this latter aspect the composite light source may have a Lighting Preference Index (LPI) of at least 120. Numerous other aspects are provided.Type: ApplicationFiled: March 8, 2017Publication date: May 10, 2018Applicant: GE Lighting Solutions, LLCInventors: Kevin James VICK, Gary Robert ALLEN, Ashfaqul I. CHOWDHURY
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Patent number: 9933308Abstract: A method of determining a modified spectral content of a light emitting diode (LED) light engine includes separating spectral data from the LED light engine into at least two spectral component bands, calculating respective efficacies for each of the at least two spectral components, simulating a first LED spectral component for a predetermined peak position and intensity, modifying spectral data from an existing LED to match a predetermined peak wavelength, applying factorial design-of-experiment techniques to the simulated first LED spectral component and the modified spectral data to obtain a selection of spectra, and selecting a spectrum from the results of the applying step, wherein the selected spectrum includes characteristics of the modified spectral content. The method includes the step of producing a LED light engine/electronic driver combination having the selected spectrum. A non-transitory medium having computer executable instructions is disclosed.Type: GrantFiled: March 28, 2014Date of Patent: April 3, 2018Assignee: GE LIGHTING SOLUTIONS, LLCInventors: Kevin Jeffrey Benner, Gary Robert Allen, Ashfaqul i. Chowdhury
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Patent number: 9676000Abstract: Methods are provided for forming a reflective coating by applying a precursor material onto the substrate; soft curing the precursor material at a first curing energy level; and thereafter, hard curing the precursor material at a second curing energy level having a higher amount of energy than the first curing energy level to form the reflective coating. Other methods are provided for forming a reflective coating a surface of a plastic substrate by heating the surface of the plastic substrate to a deposition temperature, applying a polymeric resin onto the heated surface, and crosslinking the polymeric resin to form the reflective coating. The polymeric resin can include a cross-linkable powder, a cross-linker, and a pigment, with the deposition temperature being about 10° C. or greater than the melting point of the cross-linkable binder. Lighting apparatus formed from such methods are also provided.Type: GrantFiled: December 12, 2012Date of Patent: June 13, 2017Assignee: GE LIGHTING SOLUTIONS, LLCInventors: Dengke Cai, Gary Robert Allen, Ashfaqul I. Chowdhury, Jeyachandrabose Chinniah
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Publication number: 20170089527Abstract: A lighting selection system and method obtain individualized characteristic data for each of plural light emitting devices, determine a difference between a value of the characteristic data and a designated target value for each of the light emitting devices, and group the light emitting devices into different groups based on the differences between the values of the characteristic data and the designated target value. The differences of the light emitting devices in a common group of the groups are closer together than the differences of the light emitting devices in other groups of the groups. The system and method also may select at least one of the groups of the light emitting devices for inclusion in a light device.Type: ApplicationFiled: September 15, 2016Publication date: March 30, 2017Inventors: Ashfaqul I. CHOWDHURY, Kevin Jeffrey BENNER
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Publication number: 20160316527Abstract: Composite light sources and methods use a low-blue component light source emitting first substantially white light and a high-blue component light source emitting second substantially white light. The second substantially white light has a greater correlated color temperature than the first substantially white light. The first and second substantially white light combine to provide substantially intermediate warm-white light.Type: ApplicationFiled: December 24, 2015Publication date: October 27, 2016Inventors: Gary Robert Allen, Ashfaqul I. Chowdhury, David C. Dudik, Kevin James Vick, Thomas J. Boyle
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Publication number: 20150276546Abstract: A method of determining a modified spectral content of a light emitting diode (LED) light engine includes separating spectral data from the LED light engine into at least two spectral component bands, calculating respective efficacies for each of the at least two spectral components, simulating a first LED spectral component for a predetermined peak position and intensity, modifying spectral data from an existing LED to match a predetermined peak wavelength, applying factorial design-of-experiment techniques to the simulated first LED spectral component and the modified spectral data to obtain a selection of spectra, and selecting a spectrum from the results of the applying step, wherein the selected spectrum includes characteristics of the modified spectral content. The method includes the step of producing a LED light engine/electronic driver combination having the selected spectrum. A non-transitory medium having computer executable instructions is disclosed.Type: ApplicationFiled: March 28, 2014Publication date: October 1, 2015Applicant: GE LIGHTING SOLUTIONS, LLCInventors: Kevin Jeffrey BENNER, Gary Robert ALLEN, Ashfaqul i. CHOWDHURY
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Patent number: 9127816Abstract: According to a first embodiment, a light emitting diode (LED) light engine is described. The light emitting diode includes one or more LED devices disposed on a front side of an LED light engine substrate. A heat sink having a mating receptacle for the LED light engine is also provided. The LED light engine substrate and the mating receptacle of the heat sink define a tapered fitting by which the LED light engine is retained in the mating receptacle of the heat sink.Type: GrantFiled: December 12, 2011Date of Patent: September 8, 2015Assignee: GE LIGHTING SOLUTIONS, LLCInventors: Glenn H. Kuenzler, Charles L. Huddleston, II, Jeremias A. Martins, Ashfaqul I. Chowdhury, Gary R. Allen
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Patent number: 8672516Abstract: A heat sink comprises a heat sink body, a reflective layer disposed over the heat sink body that has reflectivity greater than 90% for light in the visible spectrum, and a light transmissive protective layer disposed over the reflective layer that is light transmissive for light in the visible spectrum. The heat sink body may comprise a structural heat sink body and a thermally conductive layer disposed over the structural heat sink body where the thermally conductive layer has higher thermal conductivity than the structural heat sink body and the reflective layer is disposed over the thermally conductive layer. A light emitting diode (LED)-based lamp comprises the aforesaid heat sink and an LED module secured with and in thermal communication with the heat sink. The LED-based lamp may have an A-line bulb configuration, or may comprise a directional lamp in which the heat sink defines a hollow light-collecting reflector.Type: GrantFiled: December 28, 2010Date of Patent: March 18, 2014Assignee: GE Lighting Solutions, LLCInventors: Ashfaqul I. Chowdhury, Gary R. Allen
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Patent number: 8668356Abstract: A heat sink includes a thermally conductive layer comprising at least one of fullerenes and nanotubes disposed in a polymeric host. The thermally conductive layer may be disposed on a heat sink body, which may be thermally insulating and/or plastic, and may include surface area enhancing heat radiating structures, such as fins, with the thermally conductive layer being disposed over at least the surface area enhancing heat radiating structures. A light emitting diode (LED)-based lamp embodiment includes the heat sink and an LED module including one or more LED devices secured with and in thermal communication with the heat sink. A method embodiment includes forming the heat sink body and disposing the thermally conductive layer on the heat sink body. The disposing may comprise spray coating. An external energy field may be applied during spray coating to impart a non-random orientation to nanotubes in the polymeric host.Type: GrantFiled: December 28, 2010Date of Patent: March 11, 2014Assignee: GE Lighting Solutions, LLCInventors: Ashfaqul I. Chowdhury, Gary R. Allen, Joshua I. Rintamaki
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Publication number: 20130279174Abstract: Methods are provided for forming a reflective coating by applying a precursor material onto the substrate; soft curing the precursor material at a first curing energy level; and thereafter, hard curing the precursor material at a second curing energy level having a higher amount of energy than the first curing energy level to form the reflective coating. Other methods are provided for forming a reflective coating a surface of a plastic substrate by heating the surface of the plastic substrate to a deposition temperature, applying a polymeric resin onto the heated surface, and crosslinking the polymeric resin to form the reflective coating. The polymeric resin can include a cross-linkable powder, a cross-linker, and a pigment, with the deposition temperature being about 10° C. or greater than the melting point of the cross-linkable binder. Lighting apparatus formed from such methods are also provided.Type: ApplicationFiled: December 12, 2012Publication date: October 24, 2013Applicant: GE LIGHTING SOLUTIONS, LLCInventors: Dengke CAI, Gary Robert ALLEN, Ashfaqul I. CHOWDHURY, Jeyachandrabose CHINNIAH
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Publication number: 20120182737Abstract: According to a first embodiment, a light emitting diode (LED) light engine is described. The light emitting diode includes one or more LED devices disposed on a front side of an LED light engine substrate. A heat sink having a mating receptacle for the LED light engine is also provided. The LED light engine substrate and the mating receptacle of the heat sink define a tapered fitting by which the LED light engine is retained in the mating receptacle of the heat sink.Type: ApplicationFiled: December 12, 2011Publication date: July 19, 2012Inventors: Glenn H. Kuenzler, Charles L. Huddleston, II, Jeremias A. Martins, Ashfaqul I. Chowdhury, Gary R. Allen
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Publication number: 20120080699Abstract: A heat sink comprises a heat sink body, a reflective layer disposed over the heat sink body that has reflectivity greater than 90% for light in the visible spectrum, and a light transmissive protective layer disposed over the reflective layer that is light transmissive for light in the visible spectrum. The heat sink body may comprise a structural heat sink body and a thermally conductive layer disposed over the structural heat sink body where the thermally conductive layer has higher thermal conductivity than the structural heat sink body and the reflective layer is disposed over the thermally conductive layer. A light emitting diode (LED)-based lamp comprises the aforesaid heat sink and an LED module secured with and in thermal communication with the heat sink. The LED-based lamp may have an A-line bulb configuration, or may comprise a directional lamp in which the heat sink defines a hollow light-collecting reflector.Type: ApplicationFiled: December 28, 2010Publication date: April 5, 2012Inventors: Ashfaqul I. Chowdhury, Gary R. Allen