Patents by Inventor Desaraju Varaprasad

Desaraju 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).

  • Patent number: 7471438
    Abstract: A reflective element assembly includes a transparent substrate having forward and rearward surfaces. A transflective reflector is disposed at a surface of the substrate and the transflective reflector includes at least one thin film layer. A display element is disposed behind the substrate and is operable to emit display information that passes through the transflective reflector and the substrate for viewing by a person viewing the forward surface. Light incident on the forward surface of the substrate and passing through the substrate to be incident on the transflective reflector may exhibit a substantially non-spectrally selective reflectant characteristic as viewed by a person viewing the forward surface of the substrate. The transflective reflector may include a plurality of thin film layers, wherein the refractive indices and physical thicknesses of the individual layers may be selected to limit a tinting effect and/or a color interference effect.
    Type: Grant
    Filed: September 24, 2007
    Date of Patent: December 30, 2008
    Assignee: Donnelly Corporation
    Inventors: Ian A. McCabe, Hamid Habibi, Desaraju Varaprasad, Niall R. Lynam
  • Publication number: 20080180779
    Abstract: 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: Application
    Filed: December 14, 2007
    Publication date: July 31, 2008
    Applicant: Donnelly Corporation
    Inventors: Ian A. McCabe, Desaraju Varaprasad, Hamid Habibi, Niall R. Lynam
  • Publication number: 20080094684
    Abstract: 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: Application
    Filed: December 12, 2007
    Publication date: April 24, 2008
    Applicant: Donnelly Corporation
    Inventors: Desaraju Varaprasad, Hamid Habibi, Ian McCabe, Naill Lynam, Mingtang Zhao, Craig Dornan
  • Publication number: 20080094685
    Abstract: An exterior mirror suitable for use in a vehicular exterior rearview mirror assembly includes a reflective mirror element having a light transmitting substrate with a mirror reflector having a metallic reflective layer coated thereon. A visual indicator display is disposed to the rear of the light transmitting substrate and actuated to emit light when powered. Light emitted by light sources of the display passes through the light transmitting substrate so as to be viewed by a driver of the vehicle equipped with the reflective mirror element. The mirror element has portions of the metallic reflective layer at least partially removed by laser scribing to establish at least partially light transmissive portions of the mirror reflector so that light emitted by light sources, when powered, passes through the respective at least partially light transmissive portions to be viewed by a viewer viewing from the front of the reflective mirror element.
    Type: Application
    Filed: December 17, 2007
    Publication date: April 24, 2008
    Applicant: Donnelly Corporation
    Inventors: Desaraju Varaprasad, Mingtang Zhao, Craig Dornan, Anoop Agrawal, Pierr-Marc Allemand, Niall Lynam
  • Publication number: 20080013153
    Abstract: A reflective element assembly includes a transparent substrate having forward and rearward surfaces. A transflective reflector is disposed at a surface of the substrate and the transflective reflector includes at least one thin film layer. A display element is disposed behind the substrate and is operable to emit display information that passes through the transflective reflector and the substrate for viewing by a person viewing the forward surface. Light incident on the forward surface of the substrate and passing through the substrate to be incident on the transflective reflector may exhibit a substantially non-spectrally selective reflectant characteristic as viewed by a person viewing the forward surface of the substrate. The transflective reflector may include a plurality of thin film layers, wherein the refractive indices and physical thicknesses of the individual layers may be selected to limit a tinting effect and/or a color interference effect.
    Type: Application
    Filed: September 24, 2007
    Publication date: January 17, 2008
    Applicant: DONNELLY CORPORATION
    Inventors: Ian McCabe, Hamid Habibi, Desaraju Varaprasad, Niall Lynam
  • Patent number: 7310177
    Abstract: A rearview mirror assembly for a vehicle includes an electro-optic reflective element with an overhang region at an edge region of a first substrate that extends beyond a corresponding edge region of a second substrate. A transparent electrical conductor is disposed at a second surface of the first substrate and a mirror reflector is disposed at a third surface of the second substrate. The mirror reflector includes a tab portion that at least partially encompasses an edge dimension of the second substrate. A non-conductive seal is disposed between the first and second substrates and encompasses at least a portion of the mirror reflector and at least a portion of a non-conductive perimeter region of the third surface. A first electrical connector connects to the transparent electrical conductor via the overhang region and a second electrical connector is in electrical connection with the tab portion of the mirror reflector.
    Type: Grant
    Filed: February 22, 2007
    Date of Patent: December 18, 2007
    Assignee: Donnelly Corporation
    Inventors: Ian A. McCabe, Desaraju Varaprasad, Hamid Habibi, Niall R. Lynam
  • Publication number: 20070243391
    Abstract: A composite oxide coating is provided on a substrate over an infrared (IR) blocking multi-layer coating (e.g., low-E coating), where the composite oxide coating efficiently blocks ultraviolet (UV) radiation. The composite oxide coating and the low-E coating may be heat resistant, and the coated glass substrate may be processed in a single high temperature heat treatment step. The coated article may be effective at blocking both IR and UV radiation in applications such as window applications. The UV blocking coating may include ceria as a UV blocker in certain example embodiment of this invention.
    Type: Application
    Filed: April 13, 2006
    Publication date: October 18, 2007
    Applicant: Guardian Industries Corp.
    Inventor: Desaraju Varaprasad
  • Publication number: 20070183066
    Abstract: 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. The reflective mirror element exhibits substantial non-spectral selectivity in its reflectance. The semitransparent nondichroic reflector comprises a metal thin film layer.
    Type: Application
    Filed: January 19, 2007
    Publication date: August 9, 2007
    Applicant: Donnelly Corporation
    Inventors: Desaraju Varaprasad, Hamid Habibi, Ian McCabe, Niall Lynam, Mingtang Zhao, Craig Dornan
  • Publication number: 20070184284
    Abstract: 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 electrochromic reflective mirror element.
    Type: Application
    Filed: January 16, 2007
    Publication date: August 9, 2007
    Applicant: Donnelly Corporation
    Inventors: Desaraju Varaprasad, Mingtag Zhao, Craig Dornan, Anoop Agrawal, Pierr-Marc Allemand, Niall Lynam
  • Publication number: 20070153356
    Abstract: A rearview mirror assembly for a vehicle includes an electro-optic reflective element with an overhang region at an edge region of a first substrate that extends beyond a corresponding edge region of a second substrate. A transparent electrical conductor is disposed at a second surface of the first substrate and a mirror reflector is disposed at a third surface of the second substrate. The mirror reflector includes a tab portion that at least partially encompasses an edge dimension of the second substrate. A non-conductive seal is disposed between the first and second substrates and encompasses at least a portion of the mirror reflector and at least a portion of a non-conductive perimeter region of the third surface. A first electrical connector connects to the transparent electrical conductor via the overhang region and a second electrical connector is in electrical connection with the tab portion of the mirror reflector.
    Type: Application
    Filed: February 22, 2007
    Publication date: July 5, 2007
    Applicant: Donnelly Corporation
    Inventors: Ian McCabe, Desaraju Varaprasad, Hamid Habibi, Niall Lynam
  • Publication number: 20070148601
    Abstract: 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 of this invention, 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 makes its way through the diffuser. In certain example embodiments, the coating may include inorganic particulate in a frit matrix so that the coating may both diffuse visible light and perform UV blocking.
    Type: Application
    Filed: January 4, 2006
    Publication date: June 28, 2007
    Applicant: Guardian Industries Corp.
    Inventors: Pramod Sharma, Desaraju Varaprasad, Thomas Taylor
  • Publication number: 20070146889
    Abstract: 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 of this invention, 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 makes its way through the diffuser. In certain example embodiments, the coating may including particulate so that the coating may both diffuse visible light and perform UV blocking.
    Type: Application
    Filed: December 22, 2005
    Publication date: June 28, 2007
    Applicant: Guardian Industries Corp.
    Inventors: Zhong Wang, Pramod Sharma, Desaraju Varaprasad, Thomas Taylor
  • Publication number: 20070128449
    Abstract: An insulating glass (IG) window unit, and/or a method of making the same is/are provided. The IG window unit includes two spaced apart substrates that are separated from one another by at least one seal and/or spacer. One of the substrates supports both a solar management coating for blocking significant amounts of infrared (IR) radiation and a coating for blocking amounts of ultraviolet (UV) radiation.
    Type: Application
    Filed: December 1, 2005
    Publication date: June 7, 2007
    Applicant: Guardian Industries Corp.
    Inventors: Thomas Taylor, Yei-Ping (Mimi) Wang, Desaraju Varaprasad
  • Publication number: 20070064446
    Abstract: A diffuser is provided in an illumination system, where the diffuser is capable of blocking significant amounts of infrared (IR) and/or ultraviolet (UV) radiation. In certain example embodiments of this invention, the diffuser includes a glass substrate which supports an IR/UV coating(s) that blocks significant amounts of IR and/or UV radiation thereby reducing the amount of IR and/or UV radiation which can makes its way through the diffuser. In certain example embodiments, the coating may include particulate in a frit matrix so that the coating may both diffuse visible light and perform IR and/or UV blocking.
    Type: Application
    Filed: January 6, 2006
    Publication date: March 22, 2007
    Applicant: Guardian Industries Corp.
    Inventors: Pramod Sharma, Desaraju Varaprasad, Thomas Taylor
  • Publication number: 20070065670
    Abstract: A composite oxide coating is provided that efficiently blocks both ultraviolet (UV) and infrared (IR) radiation. Certain embodiments of this invention relate to a coating having IR and UV blocking characteristics. In certain example embodiments, the coating includes a silica matrix, zinc antimonite, and a UV blocking material such as cerium oxide, thereby permitting the coating after application to block significant amounts of both IR and UV radiation.
    Type: Application
    Filed: September 20, 2005
    Publication date: March 22, 2007
    Applicant: Guardian Industries Corp.
    Inventor: Desaraju Varaprasad
  • Patent number: 7184190
    Abstract: An electro-optic reflective element assembly includes a pair of substrates and an electro-optic medium sandwiched therebetween. Each of the pair of substrates includes at least one conductive or semi-conductive layer disposed thereon. The electrical connections may electrically connect to a respective layer and may be electrically isolated from the other layer, such as via non-conductive regions of the substrates and/or deletion lines along one of the conductive layers. The pair of substrates may be positioned relative to one another such that overhang portions of the front substrate extend beyond the corresponding edges of the rear substrate. The overlapping relationship may provide clearance for electrical connection to the conductive layers of the front and rear substrates such that the electrical connections are substantially not viewable through the front substrate.
    Type: Grant
    Filed: November 5, 2003
    Date of Patent: February 27, 2007
    Assignee: Donnelly Corporation
    Inventors: Ian A McCabe, Desaraju Varaprasad, Hamid Habibi, Niall R Lynam
  • Publication number: 20060098289
    Abstract: An electro-optic reflective element assembly includes a pair of substrates and an electro-optic medium sandwiched therebetween. Each of the pair of substrates includes at least one conductive or semi-conductive layer disposed thereon. The electrical connections may electrically connect to a respective layer and may be electrically isolated from the other layer, such as via non-conductive regions of the substrates and/or deletion lines along one of the conductive layers. The pair of substrates may be positioned relative to one another such that overhang portions of the front substrate extend beyond the corresponding edges of the rear substrate. The overlapping relationship may provide clearance for electrical connection to the conductive layers of the front and rear substrates such that the electrical connections are substantially not viewable through the front substrate.
    Type: Application
    Filed: November 5, 2003
    Publication date: May 11, 2006
    Inventors: Ian McCabe, Desaraju Varaprasad, Hamid Habibi, Niall Lynam
  • Publication number: 20060050356
    Abstract: A mirror assembly for a vehicle includes a mirror element having at least one substrate that has a forward surface and a rearward surface. The mirror element comprises at least one substantially reflective metallic layer sandwiched between a respective pair of substantially transparent non-metallic layers. Each of the substantially transparent non-metallic layers and the substantially reflective metallic layer have a selected refractive index and a selected physical thickness such that the reflective element is selectively spectrally tuned to substantially transmit at least one preselected spectral band of radiant energy therethrough while substantially reflecting other radiant energy. A radiant energy emitting element is disposed at or near the rearward surface of the at least one substrate. The radiant energy emitting element is configured to emit radiant energy with a peak intensity within the at least one preselected spectral band.
    Type: Application
    Filed: September 19, 2003
    Publication date: March 9, 2006
    Inventors: Desaraju Varaprasad, Niall Lynam
  • Publication number: 20050079326
    Abstract: An electrochromic mirror device suitable for use in a vehicle comprises a first transparent substrate having a transparent conductive layer on a surface thereof and a second substrate having a conductive layer on a surface thereof. The conductive layer of the first substrate opposes the second conductive layer of the second substrate in a spaced-apart relationship thereby forming an interpane distance between the substrates. A boundary seal is interposed between the first and second substrates spacing apart the substrates and forming a cavity wherein the interpane distance is at least about 10 microns. An electrochromic cross-linked polymeric solid film is disposed within the cavity. The electrochromic cross-linked solid polymeric film is formed from an electrochromic monomer composition that includes at least one cathodic electrochromic compound. The second conductive layer comprises a metallic reflective layer.
    Type: Application
    Filed: October 1, 2004
    Publication date: April 14, 2005
    Applicant: Donnelly Corporation
    Inventors: Desaraju Varaprasad, Mingtao Zhao, Craig Dornan, Anoop Agrawal, Pierr-Marc Allemand, Niall Lynam