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).

  • Patent number: 10661716
    Abstract: An electrically variable reflectance mirror reflective element includes front and rear glass substrates with an electrochromic medium disposed therebetween and bounded by a perimeter seal. A perimeter layer is disposed at a second surface of the front substrate proximate a perimeter edge of the front substrate. The perimeter layer conceals the perimeter seal from view by a driver of a vehicle. No part of the rear substrate extends beyond any part of the front substrate. At least a portion of the mirror reflector disposed at at least a portion of the third surface of the rear substrate extends from under the perimeter seal outward towards at least a portion of the perimeter edge of the rear substrate. The mirror reflector includes a stack of thin films that includes at least a first metal thin film and a second metal thin film.
    Type: Grant
    Filed: July 29, 2019
    Date of Patent: May 26, 2020
    Assignee: DONNELLY CORPORATION
    Inventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
  • Publication number: 20190351828
    Abstract: An electrically variable reflectance mirror reflective element includes front and rear glass substrates with an electrochromic medium disposed therebetween and bounded by a perimeter seal. A perimeter layer is disposed at a second surface of the front substrate proximate a perimeter edge of the front substrate. The perimeter layer conceals the perimeter seal from view by a driver of a vehicle. No part of the rear substrate extends beyond any part of the front substrate. At least a portion of the mirror reflector disposed at at least a portion of the third surface of the rear substrate extends from under the perimeter seal outward towards at least a portion of the perimeter edge of the rear substrate. The mirror reflector includes a stack of thin films that includes at least a first metal thin film and a second metal thin film.
    Type: Application
    Filed: July 29, 2019
    Publication date: November 21, 2019
    Inventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
  • Patent number: 10363875
    Abstract: A mirror reflective element assembly for a vehicle includes an electrically variable reflectance mirror reflective element that includes front and rear substrates with an electrochromic medium disposed therebetween and bounded by a perimeter seal. A perimeter layer is disposed at a second surface of the front substrate proximate a perimeter edge of the front substrate that conceals the perimeter seal from view by a driver of a vehicle. No part of the rear substrate extends beyond any part of the front substrate. At least a portion of the mirror reflector disposed at at least a portion of the third surface of the rear substrate extends from under the perimeter seal outward towards at least a portion of the perimeter edge of the rear substrate. The mirror reflector includes a stack of thin films that includes at least a first metal thin film and a second metal thin film.
    Type: Grant
    Filed: July 23, 2018
    Date of Patent: July 30, 2019
    Assignee: DONNELLY CORPORTION
    Inventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
  • Publication number: 20180345864
    Abstract: A mirror reflective element assembly for a vehicle includes an electrically variable reflectance mirror reflective element that includes front and rear substrates with an electrochromic medium disposed therebetween and bounded by a perimeter seal. A perimeter layer is disposed at a second surface of the front substrate proximate a perimeter edge of the front substrate that conceals the perimeter seal from view by a driver of a vehicle. No part of the rear substrate extends beyond any part of the front substrate. At least a portion of the mirror reflector disposed at at least a portion of the third surface of the rear substrate extends from under the perimeter seal outward towards at least a portion of the perimeter edge of the rear substrate. The mirror reflector includes a stack of thin films that includes at least a first metal thin film and a second metal thin film.
    Type: Application
    Filed: July 23, 2018
    Publication date: December 6, 2018
    Inventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
  • Patent number: 10029616
    Abstract: A mirror reflective element assembly for a vehicle includes an electrically variable reflectance mirror reflective element that includes front and rear substrates with an electrochromic medium disposed therebetween and bounded by a perimeter seal. A perimeter layer is disposed at a second surface of the front substrate proximate a perimeter edge of the front substrate that conceals the perimeter seal from view by a driver of a vehicle. At least a portion of the mirror reflector extends from under the perimeter seal outward towards at least a portion of the perimeter edge of the rear substrate. The mirror reflective element includes a more curved outboard region and a less curved inboard region. A laser-etched demarcation may demarcate the more curved outboard region of the mirror reflective element from the less curved inboard region of the mirror reflective element.
    Type: Grant
    Filed: January 16, 2017
    Date of Patent: July 24, 2018
    Assignee: DONNELLY CORPORATION
    Inventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
  • Publication number: 20170120827
    Abstract: A mirror reflective element assembly for a vehicle includes an electrically variable reflectance mirror reflective element that includes front and rear substrates with an electrochromic medium disposed therebetween and bounded by a perimeter seal. A perimeter layer is disposed at a second surface of the front substrate proximate a perimeter edge of the front substrate that conceals the perimeter seal from view by a driver of a vehicle. At least a portion of the mirror reflector extends from under the perimeter seal outward towards at least a portion of the perimeter edge of the rear substrate. The mirror reflective element includes a more curved outboard region and a less curved inboard region. A laser-etched demarcation may demarcate the more curved outboard region of the mirror reflective element from the less curved inboard region of the mirror reflective element.
    Type: Application
    Filed: January 16, 2017
    Publication date: May 4, 2017
    Inventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
  • Patent number: 9545883
    Abstract: An exterior rearview mirror assembly suitable for a vehicle includes an attachment portion and a casing portion having a variable reflectance mirror reflective element. A mirror reflector is disposed at at least a portion of a surface of a rear substrate of the reflective element. The mirror reflector includes a stack of thin films having at least a first metal thin film and a second metal thin film. The first metal thin film is formed of a metal material that has a specific resistivity of less than about 1×10?3 ohm·cm and the second metal thin film is formed of a metal material that has a specific resistivity of less than about 1×10?3 ohm·cm. No part of the rear substrate extends beyond any part of a front substrate of the reflective element. An indicator is disposed rearward of the reflective element and, when actuated, illuminates through the reflective element.
    Type: Grant
    Filed: July 6, 2015
    Date of Patent: January 17, 2017
    Assignee: DONNELLY CORPORATION
    Inventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
  • Patent number: 9272949
    Abstract: Certain example embodiments of this invention relate to the development of temperable UV blocking coatings having enhanced UV blocking efficiency and aesthetic appearance on stock sheets of glass substrates using large-scale wet coating manufacturing methods. A glass substrate is provided. A base coat is curtain coated on the glass substrate from a oxide precursor material including zinc, cerium, titanium, and silicon precursor materials. The base coat is cured. A top coat is roll coated, directly or indirectly, on the base coat, with the top coat being a sacrificial cross-linked organic polymer-based layer. The substrate is heat treated with the base coat and the top coat thereon. The base coat and the top coat are substantially uniform in thickness, and the heat treating removes substantially all of the top coat while causing substantially no cracking in the base coat.
    Type: Grant
    Filed: July 9, 2010
    Date of Patent: March 1, 2016
    Assignee: Guardian Industries Corp.
    Inventors: Desaraju V. Varaprasad, David B. Orleans, Zhongming Wang
  • Publication number: 20150307027
    Abstract: An exterior rearview mirror assembly suitable for a vehicle includes an attachment portion and a casing portion having a variable reflectance mirror reflective element. A mirror reflector is disposed at at least a portion of a surface of a rear substrate of the reflective element. The mirror reflector includes a stack of thin films having at least a first metal thin film and a second metal thin film. The first metal thin film is formed of a metal material that has a specific resistivity of less than about 1×10?3 ohm·cm and the second metal thin film is formed of a metal material that has a specific resistivity of less than about 1×10?3 ohm·cm. No part of the rear substrate extends beyond any part of a front substrate of the reflective element. An indicator is disposed rearward of the reflective element and, when actuated, illuminates through the reflective element.
    Type: Application
    Filed: July 6, 2015
    Publication date: October 29, 2015
    Inventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
  • Patent number: 9073491
    Abstract: An exterior rearview mirror assembly suitable for a vehicle includes an attachment portion and a casing portion having a variable reflectance mirror reflective element. A mirror reflector is disposed at at least a portion of a surface of a rear substrate of the reflective element. The mirror reflector includes a stack of thin films having at least a first metal thin film and a second metal thin film. The first metal thin film is formed of a metal material that has a specific resistivity of less than about 1×10?3 ohm·cm and the second metal thin film is formed of a metal material that has a specific resistivity of less than about 1×10?3 ohm·cm. No part of the rear substrate extends beyond any part of a front substrate of the reflective element. An indicator is disposed rearward of the reflective element and, when actuated, illuminates through the reflective element.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: July 7, 2015
    Assignee: DONNELLY CORPORATION
    Inventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
  • Patent number: 9061481
    Abstract: Certain example embodiments relate to robust semi-transparent coatings that are suitable for use in a wide variety of display-on-demand mirror applications, and methods of making the same. In certain example embodiments, a coated article includes a coating supported by a glass substrate. A reflective metal-inclusive layer is formed, directly or indirectly, on the glass substrate. A silicon oxide inclusive layer is formed, directly or indirectly, on the reflective metallic layer. A titanium oxide inclusive layer is formed, directly or indirectly, on the silicon oxide inclusive layer. The metal-inclusive layer is formed so as to reflect incoming light away from the glass substrate such that substantially less incoming light would be reflected away from the glass substrate if lighting were provided on a side of the glass substrate opposite the coating than if no lighting were provided. The surface of the coated article need not necessarily be conductive.
    Type: Grant
    Filed: October 9, 2012
    Date of Patent: June 23, 2015
    Assignee: Guardian Industires Corp.
    Inventors: Desaraju V. Varaprasad, Yiwei Lu
  • Publication number: 20140340925
    Abstract: An exterior rearview mirror assembly suitable for a vehicle includes an attachment portion and a casing portion having a variable reflectance mirror reflective element. A mirror reflector is disposed at at least a portion of a surface of a rear substrate of the reflective element. The mirror reflector includes a stack of thin films having at least a first metal thin film and a second metal thin film. The first metal thin film is formed of a metal material that has a specific resistivity of less than about 1×10?3 ohm·cm and the second metal thin film is formed of a metal material that has a specific resistivity of less than about 1×10?3 ohm·cm. No part of the rear substrate extends beyond any part of a front substrate of the reflective element. An indicator is disposed rearward of the reflective element and, when actuated, illuminates through the reflective element.
    Type: Application
    Filed: August 4, 2014
    Publication date: November 20, 2014
    Inventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
  • Patent number: 8797627
    Abstract: An exterior rearview mirror assembly includes a variable reflectance mirror reflective element. A mirror reflector of the mirror reflective element includes a stack of thin films having at least two thin films. At least one of the thin films is formed of a material that has a specific resistivity of less than about 1×10?2 ohm·cm, and at least one of the thin films is a thin metal film. An electrochromic medium is disposed in an interpane cavity of the mirror reflective element and is bounded by a perimeter seal. A reflective perimeter layer is disposed at a second surface of a front substrate proximate a perimeter edge of the front substrate. The perimeter layer generally conceals the perimeter seal from view by a driver of the vehicle normally viewing the front substrate when the exterior rearview mirror assembly is mounted at the vehicle.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: August 5, 2014
    Assignee: Donnelly Corporation
    Inventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
  • Patent number: 8668961
    Abstract: Methods of making titania coatings having self cleaning properties, and associated articles are provided. In certain example instances, a substrate supports a layer comprising titanium dioxide. The substrate may support multiple layers. In certain examples, the titanium dioxide layer is made using a process involving a titania precursor and a photomonomer. The titanium dioxide coating may be applied as a liquid directly or indirectly on a substrate, then permitted to cure. After curing using ultraviolet radiation and/or electron beams, the resulting coating may inhibit fouling, be antireflective, be highly durable, self cleaning and/or hydrophilic in certain instances.
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: March 11, 2014
    Assignee: Guardian Industries Corp.
    Inventor: Desaraju V. Varaprasad
  • Patent number: 8610992
    Abstract: A variable transmission window includes a first substrate having a first transparent conductor coated surface and a second substrate having a second transparent conductor coated surface. The second substrate is positioned relative to the first substrate with the first and second transparent conductor coated surfaces facing each other. An electrochromic medium is disposed between the first and second substrates whereby the transmission of light through the electrochromic medium is changed when an electrical potential is applied thereto. The electrochromic medium includes a cross-linked film. The window may be one of (i) an aeronautical glazing and (ii) a vehicle glazing, and/or the window may be a large area glazing of an area of at least 99 square inches.
    Type: Grant
    Filed: October 22, 2012
    Date of Patent: December 17, 2013
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Mingtang Zhao, Craig A. Dornan, Anoop Agrawal, Pierr-Marc Allemand, Niall R. Lynam
  • Patent number: 8559093
    Abstract: An electrochromic mirror reflective element suitable for use in a rearview mirror assembly of a vehicle includes first and second substrates having an electrochromic medium disposed therebetween and bounded by a perimeter seal. A perimeter coating is disposed at a second surface of the first substrate proximate at least a perimeter portion of the first substrate. The perimeter coating generally conceals the perimeter seal from view by a person viewing a first surface of the first substrate and through the first substrate. An at least partially reflective stack of thin films is disposed at least a portion of a third surface of the second substrate. The perimeter seal is at least partially visible to a person viewing a fourth surface of the second substrate and through the second substrate.
    Type: Grant
    Filed: April 20, 2012
    Date of Patent: October 15, 2013
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Mingtang Zhao, Craig A. Dornan, Anoop Agrawal, Pierr-Marc Allemand, Niall R. Lynam
  • Patent number: 8541062
    Abstract: Methods for making multi-layered anti-reflective coatings are disclosed. Un-solgel precursor compositions may be prepared having inorganic oxide precursors and UV curable acrylic monomer mixtures, deposited on a substrate, and subsequently the coated substrate may be cured by exposure to electromagnetic radiation, such as UV radiation. The coating layers may be heated using a temperature sufficient to burn off organic content and form a multi-layer anti-reflective coating. Substrates comprising such coatings and photovoltaic devices comprising such substrates and coatings are also disclosed.
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: September 24, 2013
    Assignee: Guardian Industries Corp.
    Inventor: Desaraju V. Varaprasad
  • Patent number: 8511841
    Abstract: A vehicular blind spot indicator mirror includes a transparent glass substrate having a mirror reflector coated onto the substrate. Visible light reflectance by the mirror reflector coated substrate is at least about 40 percent visible light reflectance for visible light incident upon a front side of the mirror reflector coated substrate. A blind spot indicator light display is disposed to the rear of the mirror reflector coated substrate and emits visible light upon a detection by a blind spot detector. Light emitted by the display passes through the transparent glass substrate to be viewed by a viewer viewing from the front side of the substrate. The display is operable, when electrically powered and when operated in the vehicle during day time driving conditions, to exhibit a display luminance of at least about 60 foot lamberts as measured with the display placed behind, and emitting light through, the transparent glass substrate.
    Type: Grant
    Filed: January 13, 2011
    Date of Patent: August 20, 2013
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Hamid Habibi, Ian A. McCabe, Niall R. Lynam, Mingtang Zhao, Craig A. Dornan
  • Patent number: 8506737
    Abstract: A method of making an insulating glass (IG) window unit includes: having a coated article including a multi-layered low-E coating on a glass substrate; at least two flexible protective sheets adhered to a top surface of the low-E coating via at least an adhesive layer, and a protective coating over the low-E coating and/or over at least one of the flexible protective sheets in order to substantially fill one or more gaps formed between the low-E coating and the flexible protective sheet(s) and/or between the flexible protective sheets; and following cutting, edge seaming, and/or washing, removing at least part of the temporary protective coating by peeling the protective sheets off and removing at least part of the protective coating when peeling off the protective sheets.
    Type: Grant
    Filed: July 11, 2012
    Date of Patent: August 13, 2013
    Assignees: Centre Luxembourgeois de Recherches pour le Verre et al Ceramique S.A. (C.R.V.C.), Guardian Industries Corp.
    Inventors: Jean-Marc Sol, Herbert Lage, John A. Vanderploeg, Desaraju V. Varaprasad, Lutz Henkel, Marcel Schloremberg
  • Patent number: 8450594
    Abstract: 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: Grant
    Filed: December 11, 2007
    Date of Patent: May 28, 2013
    Assignee: Guardian Industries Corp.
    Inventor: Desaraju V. Varaprasad