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: 10661716Abstract: 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: GrantFiled: July 29, 2019Date of Patent: May 26, 2020Assignee: DONNELLY CORPORATIONInventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
-
Publication number: 20190351828Abstract: 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: ApplicationFiled: July 29, 2019Publication date: November 21, 2019Inventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
-
Patent number: 10363875Abstract: 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: GrantFiled: July 23, 2018Date of Patent: July 30, 2019Assignee: DONNELLY CORPORTIONInventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
-
Publication number: 20180345864Abstract: 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: ApplicationFiled: July 23, 2018Publication date: December 6, 2018Inventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
-
Patent number: 10029616Abstract: 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: GrantFiled: January 16, 2017Date of Patent: July 24, 2018Assignee: DONNELLY CORPORATIONInventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
-
Publication number: 20170120827Abstract: 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: ApplicationFiled: January 16, 2017Publication date: May 4, 2017Inventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
-
Patent number: 9545883Abstract: 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: GrantFiled: July 6, 2015Date of Patent: January 17, 2017Assignee: DONNELLY CORPORATIONInventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
-
Patent number: 9272949Abstract: 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: GrantFiled: July 9, 2010Date of Patent: March 1, 2016Assignee: Guardian Industries Corp.Inventors: Desaraju V. Varaprasad, David B. Orleans, Zhongming Wang
-
Publication number: 20150307027Abstract: 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: ApplicationFiled: July 6, 2015Publication date: October 29, 2015Inventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
-
Patent number: 9073491Abstract: 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: GrantFiled: August 4, 2014Date of Patent: July 7, 2015Assignee: DONNELLY CORPORATIONInventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
-
Patent number: 9061481Abstract: 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: GrantFiled: October 9, 2012Date of Patent: June 23, 2015Assignee: Guardian Industires Corp.Inventors: Desaraju V. Varaprasad, Yiwei Lu
-
Publication number: 20140340925Abstract: 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: ApplicationFiled: August 4, 2014Publication date: November 20, 2014Inventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
-
Patent number: 8797627Abstract: 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: GrantFiled: December 17, 2012Date of Patent: August 5, 2014Assignee: Donnelly CorporationInventors: Ian A. McCabe, Desaraju V. Varaprasad, Hamid Habibi, Niall R. Lynam
-
Patent number: 8668961Abstract: 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: GrantFiled: July 31, 2008Date of Patent: March 11, 2014Assignee: Guardian Industries Corp.Inventor: Desaraju V. Varaprasad
-
Patent number: 8610992Abstract: 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: GrantFiled: October 22, 2012Date of Patent: December 17, 2013Assignee: Donnelly CorporationInventors: Desaraju V. Varaprasad, Mingtang Zhao, Craig A. Dornan, Anoop Agrawal, Pierr-Marc Allemand, Niall R. Lynam
-
Patent number: 8559093Abstract: 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: GrantFiled: April 20, 2012Date of Patent: October 15, 2013Assignee: Donnelly CorporationInventors: Desaraju V. Varaprasad, Mingtang Zhao, Craig A. Dornan, Anoop Agrawal, Pierr-Marc Allemand, Niall R. Lynam
-
Patent number: 8541062Abstract: 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: GrantFiled: September 28, 2009Date of Patent: September 24, 2013Assignee: Guardian Industries Corp.Inventor: Desaraju V. Varaprasad
-
Patent number: 8511841Abstract: 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: GrantFiled: January 13, 2011Date of Patent: August 20, 2013Assignee: Donnelly CorporationInventors: Desaraju V. Varaprasad, Hamid Habibi, Ian A. McCabe, Niall R. Lynam, Mingtang Zhao, Craig A. Dornan
-
Patent number: 8506737Abstract: 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: GrantFiled: July 11, 2012Date of Patent: August 13, 2013Assignees: 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: 8450594Abstract: 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: GrantFiled: December 11, 2007Date of Patent: May 28, 2013Assignee: Guardian Industries Corp.Inventor: Desaraju V. Varaprasad