Patents by Inventor Desaraju V. Varaprasad
Desaraju V. Varaprasad 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: 7586666Abstract: An interior rearview mirror system for a vehicle includes an interior rearview mirror assembly including a reflective element having a transparent glass substrate with a transflective reflector established at a surface thereof. The transflective reflector includes at least three thin film layers, which include at least one metallic layer. The transflective reflector exhibits a substantially spectrally neutral reflectant characteristic as viewed by a driver operating a vehicle equipped with the mirror assembly. A backlit active matrix liquid crystal video display screen is disposed behind the transflective reflector. Display information passes through the glass substrate and the transflective reflector for viewing by a driver operating the equipped vehicle. At least one silicon photo sensor is configured to detect ambient light at the vehicle, and the display intensity is adjustable responsive to a sensing of ambient light by the least one silicon photo sensor.Type: GrantFiled: December 23, 2008Date of Patent: September 8, 2009Assignee: Donnelly Corp.Inventors: Ian A. McCabe, Hamid Habibi, Desaraju V. Varaprasad, Niall R. Lynam
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Publication number: 20090207514Abstract: A reflective mirror assembly includes an electrochromic reflective element providing a rearward field of view to a driver of a vehicle equipped with the reflective mirror assembly. The electrochromic reflective element includes an electrochromic medium disposed between a front substrate and a rear substrate in a cavity established by a seal that connects the front substrate to the rear substrate and that spaces them apart. An overhang region at a first edge region of the front substrate extends beyond a corresponding first edge region of the rear substrate. A transparent electrical conductor is disposed at the front substrate and a mirror reflector is disposed at the rear substrate. An electrically conducting tab extends outward from said seal at least partially to the edge of the rear substrate while making electrical contact with the mirror reflector. At least one hiding layer is disposed around a perimeter region of the front substrate.Type: ApplicationFiled: April 24, 2009Publication date: August 20, 2009Applicant: DONNELLY CORPORATIONInventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
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Patent number: 7572017Abstract: A signal mirror system for a vehicle includes a reflective mirror element comprising a semitransparent nondichroic mirror reflector coated onto a light-transmitting substrate. The visible light transmission through the reflective mirror element is in the range of from about 1% visible light transmission to about 30% visible light transmission and the visible light reflectance is in the range from 40% visible light reflectance to 80% visible light reflectance for visible light incident upon the front side of the reflective mirror element. A turn signal display having at least one light emitting diode is disposed to the rear of the reflective mirror element and configured to emit light that light passes through the semitransparent mirror reflector to be viewed by a viewer viewing from the front of the reflective mirror element with a display luminance of at least about 30 foot lamberts.Type: GrantFiled: January 19, 2007Date of Patent: August 11, 2009Assignee: Donnelly CorporationInventors: Desaraju V. Varaprasad, Hamid Habibi, Ian A. McCabe, Niall R. Lynam, Mingtang Zhao, Craig A. Dornan
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Patent number: 7543947Abstract: A rearview mirror element for a motor vehicle includes a light transmitting substrate having a visible light reflecting and visible light transmitting mirror reflector disposed on a surface thereof. A display-on-demand display device is disposed behind the substrate such that light emitted by the display device when powered passes through both the light transmitting substrate and the mirror reflector. The display device exhibits, when powered during day time driving conditions, a display luminance of at least about 60 foot lamberts. When not emitting light, the disposition of the display device to the rear of the light transmitting substrate is not substantially distinguishable to the driver of the equipped vehicle when viewing the mirror element. To the rear of the light transmitting substrate is rendered substantially opaque by a light absorbing element that is disposed at least adjacent to where, and except at where, the display device is disposed therebehind.Type: GrantFiled: October 6, 2005Date of Patent: June 9, 2009Assignee: Donnelly CorporationInventors: Desaraju V. Varaprasad, Hamid Habibi, Ian A. McCabe, Niall R. Lynam, Mingtang Zhao, Craig A. Dornan
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Publication number: 20090116097Abstract: An interior rearview mirror system for a vehicle includes an interior rearview mirror assembly including a reflective element having a transparent glass substrate with a transflective reflector established at a surface thereof. The transflective reflector includes at least three thin film layers, which include at least one metallic layer. The transflective reflector exhibits a substantially spectrally neutral reflectant characteristic as viewed by a driver operating a vehicle equipped with the mirror assembly. A backlit active matrix liquid crystal video display screen is disposed behind the transflective reflector. Display information passes through the glass substrate and the transflective reflector for viewing by a driver operating the equipped vehicle. At least one silicon photo sensor is configured to detect ambient light at the vehicle, and the display intensity is adjustable responsive to a sensing of ambient light by the least one silicon photo sensor.Type: ApplicationFiled: December 23, 2008Publication date: May 7, 2009Applicant: DONNELLY CORPORATIONInventors: Ian A. McCabe, Hamid Habibi, Desaraju V. Varaprasad, Niall R. Lynam
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Patent number: 7525715Abstract: A reflective mirror assembly includes an electrochromic reflective element providing a rearward field of view to a driver of a vehicle equipped with the reflective mirror assembly. The electrochromic reflective element includes an electrochromic medium disposed between a front substrate and a rear substrate in a cavity established by a seal that connects the front substrate to the rear substrate and that spaces them apart. An overhang region at a first edge region of the front substrate extends beyond a corresponding first edge region of the rear substrate. A transparent electrical conductor is disposed at the front substrate and a mirror reflector is disposed at the rear substrate. An electrically conducting tab extends outward from said seal at least partially to the edge of the rear substrate while making electrical contact with the mirror reflector. At least one hiding layer is disposed around a perimeter region of the front substrate.Type: GrantFiled: December 14, 2007Date of Patent: April 28, 2009Assignee: Donnelly CorporationInventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
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Publication number: 20090101209Abstract: A low-index silica coating may be made by forming silica sol including a silane and/or a colloidal silica. The silica precursor may be deposited on a substrate (e.g., glass substrate) to form a coating layer. The coating layer may then be cured and/or fired using temperature(s) of from about 550 to 700° C. A barrier undercoating including a metal oxide, such as, silica, alumina, titania, zirconia, and/or an oxynitride of silica may be deposited between the coating layer and substrate. Preferably, the barrier undercoating does not substantially affect the percent transmission or reflection of the low-index silica coating. The low-index silica based coating may be used as an antireflective (AR) film on a front glass substrate of a photovoltaic device (e.g., solar cell) or any other suitable application in certain example instances.Type: ApplicationFiled: October 19, 2007Publication date: April 23, 2009Applicant: Guardian Industries Corp.Inventors: Pramod K. Sharma, Nathan P. Mellott, Desaraju V. Varaprasad, Yiwei Lu, Scott V. Thomsen
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Publication number: 20090075092Abstract: A low-index silica coating may be made by forming silica sol comprising a silane and/or a colloidal silica. The silica precursor may be deposited on a substrate (e.g., glass substrate) to form a coating layer. The coating layer may then be cured and/or fired using temperature(s) of from about 550 to 700° C. A surface treatment composition comprising an organic material comprising an alkyl chain or a fluoro-alkyl chain and at least one reactive functionality comprising silicon and/or phosphorous may be formed, deposited on the coating layer, then cured and/or fired to form an overcoat layer Preferably, the overcoat layer does not substantially affect the percent transmission or reflection of the low-index silica coating. The low-index silica based coating may be used as an antireflective (AR) film on a front glass substrate of a photovoltaic device (e.g., solar cell) or any other suitable application in certain example instances.Type: ApplicationFiled: September 18, 2007Publication date: March 19, 2009Applicant: Guardian Industries Corp.Inventor: Desaraju V. Varaprasad
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Publication number: 20090068350Abstract: A temporary protective coating is provided over a coated glass substrate. The temporary protective coating is preferably applied in liquid form then solidified on the substrate. In some instances, the temporary protective coating may be easily removed by simply peeling it off. In certain example embodiments, the temporary protective coating is applied after heat treatment and is removed by peeling it off before the coated substrate is coupled to another substrate to form a window unit such as an IG window unit or a laminated vehicle windshield.Type: ApplicationFiled: August 8, 2008Publication date: March 12, 2009Applicant: Guardian Industries Corp.Inventors: Desaraju V. Varaprasad, John A. Vanderploeg
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Publication number: 20090067032Abstract: A vehicular signal mirror includes a reflective mirror element comprising a mirror reflector on a light-transmitting substrate. The visible light reflectance is at least about 40% for visible light incident upon the front side of the reflective mirror element. A turn signal light display and/or a blind-spot indicator light display is disposed to the rear of the reflective mirror element and configured so that the light emitted by the light display passes through the reflective mirror element to be viewed by a viewer viewing from the front of the reflective mirror element. The light display exhibits, when electrically powered and when operated in the vehicle during day time driving conditions, a display luminance of at least about 60 foot lamberts as measured with the light display placed behind, and emitting light through, the reflective mirror element.Type: ApplicationFiled: November 10, 2008Publication date: March 12, 2009Applicant: DONNELLY CORPORATIONInventors: Desaraju V. Varaprasad, Hamid Habibi, Ian A. McCabe, Niall R. Lynam, Mingtang Zhao, Craig A. Dornan
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Patent number: 7494231Abstract: A vehicular signal mirror includes a reflective mirror element comprising a mirror reflector on a light-transmitting substrate. The visible light reflectance is at least about 40% for visible light incident upon the front side of the reflective mirror element. A turn signal light display and/or a blind-spot indicator light display is disposed to the rear of the reflective mirror element and configured so that the light emitted by the light display passes through the reflective mirror element to be viewed by a viewer viewing from the front of the reflective mirror element. The light display exhibits, when electrically powered and when operated in the vehicle during day time driving conditions, a display luminance of at least about 30 foot lamberts as measured with the light display placed behind, and emitting light through, the reflective mirror element.Type: GrantFiled: December 12, 2007Date of Patent: February 24, 2009Assignee: Donnelly CorporationInventors: Desaraju V. Varaprasad, Hamid Habibi, Ian A. McCabe, Niall R. Lynam, Mingtang Zhao, Craig A. Dornan
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Publication number: 20090044897Abstract: A temporary protective coating is provided over a coated glass substrate. The temporary protective coating is preferably applied in an aqueous dispersion then solidified on the substrate. In some instances, the temporary protective coating may be removed by treatment with a basic solution. In certain example embodiments, the temporary protective coating is applied after heat treatment before the coated substrate is coupled to another substrate to form a window unit such as an IG window unit or a laminated vehicle windshield.Type: ApplicationFiled: August 8, 2008Publication date: February 19, 2009Applicant: Guardian Industries Corp.Inventors: Scott V. Thomsen, Desaraju V. Varaprasad
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Publication number: 20090025777Abstract: A low-index silica coating may be made by forming a silica precursor having a radiation curable composition including a radiation curable monomer and/or a photoinitiator, and also including a silica sol comprising a silane and/or a colloidal silica. The silica precursor may be deposited on a substrate (e.g., glass substrate or silicon wafer) to form a coating layer. The coating layer may then be cured via exposure to electromagnetic radiation, such as UV radiation. Then, the cured coating layer may be fired using temperature(s) of from about 550 to 700° C., in forming the low-index silica based coating. The low-index silica based coating may be used as an antireflective (AR) film on a front glass substrate of a photovoltaic device (e.g., solar cell) in certain example instances.Type: ApplicationFiled: December 11, 2007Publication date: January 29, 2009Applicant: Guardian Industries Corp.Inventor: Desaraju V. Varaprasad
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Publication number: 20090025776Abstract: A low-index silica coating may be made by forming a silica precursor having a radiation curable composition including a radiation curable monomer and/or a photoinitiator, and also including a silica sol comprising a silane and/or a colloidal silica. The silica precursor may be deposited on a substrate (e.g., glass substrate) to form a coating layer. The coating layer may then be cured via exposure to electromagnetic radiation, such as UV radiation. Then, the cured coating layer may be fired using temperature(s) of from about 550 to 700° C., in forming the low-index silica based coating. The low-index silica based coating may be used as an antireflective (AR) film on a front glass substrate of a photovoltaic device (e.g., solar cell) in certain example instances.Type: ApplicationFiled: July 26, 2007Publication date: January 29, 2009Applicant: Guardian Industries Corp.Inventor: Desaraju V. Varaprasad
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Publication number: 20080302462Abstract: In certain example embodiments of this invention, there is provided a method of making a window, the method including: forming a multi-layered low-E and/or solar control coating on a glass substrate; providing at least two flexible protective sheets in non-liquid form to the glass substrate over at least part of the low-E and/or solar control coating; applying at least one protective coating in liquid form, before and/or after the flexible protective sheets are provided, so as to reduce one or more gaps formed between the low-E and/or solar control coating and the flexible protective sheet(s) and/or between the flexible protective sheets; and performing one or more of cutting, edge seaming, and/or washing the coated article with the protective coating and protective sheets thereon and peeling the protective sheets and at least part of the protective coating off of the top surface of the low-E and/or solar control coating. Heat treatment (e.g.Type: ApplicationFiled: June 6, 2007Publication date: December 11, 2008Applicants: Gaurdian Industries Corp.Inventors: Jean-Marc Sol, Herbert Lage, John A. Vanderploeg, Desaraju V. Varaprasad, Lutz Henkel, Marcel Schloremberg
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Publication number: 20080291522Abstract: An exterior reflective mirror element suitable for a vehicle includes a transparent glass substrate having a reflector and a visual indicator display disposed to the rear of the substrate. The visual indicator display may be part of a blind spot detection and display system of the vehicle wherein the visual indicator display is actuated to emit light responsive to a detection by a blind spot detection detector of the equipped vehicle of an overtaking vehicle in a side lane adjacent the side of the equipped vehicle. The visual indicator display includes at least a first indicator at a first location to the rear of the exterior reflective mirror element. A first portion of the reflector may be at least partially removed at the first location in order to establish an at least partially transmissive first portion of the exterior reflective mirror element at the first location.Type: ApplicationFiled: April 3, 2008Publication date: November 27, 2008Applicant: DONNELLY CORPORATIONInventors: Desaraju V. Varaprasad, Mingtang Zhao, Craig Allen Dornan, Anoop Agrawal, Pierr-Marc Allemand, Niall R. Lynam
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Patent number: 7446939Abstract: A diffuser is provided in an illumination system, where the diffuser is capable of blocking significant amounts of ultraviolet (UV) radiation. In certain example embodiments, the diffuser includes a glass substrate which supports a UV coating(s) that blocks significant amounts of UV radiation thereby reducing the amount of UV radiation which can make its way through the diffuser. In certain example embodiments, the coating may include inorganic particulate in a fit matrix so that the coating may both diffuse visible light and perform UV blocking.Type: GrantFiled: January 4, 2006Date of Patent: November 4, 2008Assignee: Guardian Industries Corp.Inventors: Pramod K. Sharma, Desaraju V. Varaprasad, Thomas J. Taylor
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Publication number: 20080268260Abstract: A composite oxide coating is provided on a substrate over an optional infrared (IR) blocking multi-layer coating (e.g., low-E coating), where the composite oxide coating efficiently blocks ultraviolet (UV) radiation. An organic polymer top coating may be provided over the composite oxide, where the organic polymer may be formed by exposing a photomonomer and/or photopolymer to radiation (e.g., UV radiation). The coated glass substrate may be heat and/or crack resistant and may be subjected to a high temperature heat treatment step. The coated article may be effective at blocking IR and/or UV radiation in applications such as window applications. The UV blocking coating may include ceria, titania, and silica as UV blocker(s) in certain example embodiment of this invention.Type: ApplicationFiled: April 27, 2007Publication date: October 30, 2008Inventors: Desaraju V. Varaprasad, John P. Hogan
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Publication number: 20080180781Abstract: A display mirror assembly includes a reflective mirror element having a semitransparent mirror reflector coated onto a light-transmitting substrate. Visible light transmission through the reflective mirror element is at least 3 percent and visible light reflectance by the reflective mirror element is at least 40 percent for visible light incident upon the front side of the reflective mirror element. The reflective mirror element does not exhibit substantial spectral selectivity in its reflectance of visible light incident upon its front side. A display device is disposed to the rear of the reflective mirror element and configured so that light emitted by the display device passes through the semitransparent mirror reflector to be viewed by a viewer viewing from the front. When electrically powered, a display luminance of at least about 60 foot lamberts as measured with said display device placed behind, and emitting light through, the reflective element is achieved.Type: ApplicationFiled: April 1, 2008Publication date: July 31, 2008Applicant: DONNELLY CORPORATIONInventors: Desaraju V. Varaprasad, Hamid Habibi, Ian A. McCabe, Niall R. Lynam, Mingtang Zhao, Craig A. Dornan
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Patent number: 7349144Abstract: An exterior electrochromic reflective mirror element for a vehicular exterior rearview mirror assembly comprises an electrochromic cross-linked polymeric solid film disposed between a first substrate and a second substrate. The electrochromic cross-linked polymeric solid film contacts a transparent conductive layer of the first substrate and a conductive layer comprising a metallic reflective layer of the second substrate. A visual indicator display is disposed to the rear of said second substrate and is part of a blind spot detection and display system and is actuated to emit light responsive to a detection of another overtaking vehicle in a side lane. Light emitted by the visual indicator display passes through the second substrate, through the electrochromic cross-linked polymeric solid film and through the first substrate to be viewed by a driver of the vehicle equipped with the exterior electochromic reflective mirror element.Type: GrantFiled: January 16, 2007Date of Patent: March 25, 2008Assignee: Donnelly CorporationInventors: Desaraju V. Varaprasad, Mingtao Zhao, Craig Allen Dornan, Anoop Agrawal, Niall R. Lynam, Pierr-Marc Allemand