Patents by Inventor Srikanth Varanasi

Srikanth Varanasi 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).

  • Publication number: 20150017431
    Abstract: A CVD process for depositing a zinc oxide coating is provided. The CVD process includes providing a moving glass substrate. The CVD process also includes forming a gaseous mixture of an alkyl zinc compound and an inert gas as a first stream, providing a first gaseous inorganic oxygen-containing compound in a second stream and providing a second gaseous inorganic oxygen-containing compound in the second stream, a third stream or in both the second and third streams. Additionally, the CVD process includes mixing the streams at or near a surface of the moving glass substrate and a zinc oxide coating is formed thereon. A method for forming a coated glass article is also provided. Additionally, a coated glass article is provided.
    Type: Application
    Filed: March 8, 2013
    Publication date: January 15, 2015
    Applicant: PILKINGTON GROUP LIMITED
    Inventors: Yu Wang, Srikanth Varanasi, David Alan Strickler
  • Publication number: 20140037925
    Abstract: The invention relates to a multi-layer pyrolytic coating stack deposited on a tinted glass substrate to form a coated glass article exhibiting a desired combination of emissivity, visible light transmittance and solar heat gain coefficient. A method for depositing the multi-layer coating stack on the tinted glass substrate is also part of the invention.
    Type: Application
    Filed: March 15, 2012
    Publication date: February 6, 2014
    Applicant: PILKINGTON GROUP LIMITED
    Inventors: Michel J. Soubeyrand, Srikanth Varanasi
  • Patent number: 8465841
    Abstract: A coated glass article, particularly for use as architectural glass, is gold in appearance. The coated glass article includes a glass substrate with an iron oxide coating deposited thereover, the iron oxide coating comprising primarily iron oxide in the form Fe2O3. The coated glass article has an a* value between about ?5 and about 10, and a b* value between about 10 and about 40, for both transmitted and reflected light.
    Type: Grant
    Filed: April 4, 2011
    Date of Patent: June 18, 2013
    Assignee: Pilkington North America, Inc.
    Inventors: Srikanth Varanasi, Michael P. Remington, Jr.
  • Patent number: 8158262
    Abstract: A multi-layer thin film having as a primary component, a coating of highly doped zinc oxide, and optionally, a color suppression underlayer and a protective metal oxide overcoat. The film stack is preferably deposited on a transparent substrate by atmospheric chemical vapor deposition. The film stack exhibits a desirable combination of properties including high visible light transmittance, relatively low solar energy transmittance, low emissivity, and high solar selectivity.
    Type: Grant
    Filed: June 4, 2007
    Date of Patent: April 17, 2012
    Assignees: Pilkington Group Limited, Arkema, Inc.
    Inventors: Srikanth Varanasi, David A. Strickler
  • Publication number: 20110281109
    Abstract: A coated glass article, particularly for use as architectural glass, is gold in appearance. The coated glass article includes a glass substrate with an iron oxide coating deposited thereover, the iron oxide coating comprising primarily iron oxide in the form Fe2O3. The coated glass article has an a* value between about ?5 and about 10, and a b* value between about 10 and about 40, for both transmitted and reflected light.
    Type: Application
    Filed: April 4, 2011
    Publication date: November 17, 2011
    Inventors: Srikanth Varanasi, Michael P. Remington, JR.
  • Patent number: 7968201
    Abstract: A multi-layer thin film stack, particularly suitable as a component of a solar cell, is deposited on a transparent dielectric substrate. The multi-layer film stack comprises a transparent electrically conductive metal oxide layer deposited over the dielectric substrate, the conductive metal oxide layer having a refractive index less than 2.0, a light transmittance optimizing interlayer having a refractive index between 2.3 and 3.5, deposited over the electrically conductive metal oxide layer, and a silicon layer having a refractive index of at least 4.5 deposited over the light transmittance optimizing interlayer. The film stack can be deposited by any suitable method, but deposition of each of these layers by atmospheric chemical vapor deposition is preferred.
    Type: Grant
    Filed: August 24, 2006
    Date of Patent: June 28, 2011
    Assignees: Pilkington Group Limited, Pilkington North America, Inc.
    Inventors: Douglas M. Nelson, Gary Nichol, Srikanth Varanasi
  • Patent number: 7939129
    Abstract: A method is defined for producing an iron oxide coating on a glass article. The article is preferably for use as an architectural glazing. The method includes providing a heated glass substrate having a surface on which the coating is to be deposited. Ferrocene and an oxidant are directed toward and along the surface to be coated, and the ferrocene and the oxidant are reacted at or near the surface of the glass substrate to form an iron oxide coating.
    Type: Grant
    Filed: January 26, 2004
    Date of Patent: May 10, 2011
    Assignee: Pilington North America, Inc.
    Inventors: Srikanth Varanasi, Michael P. Remington, Jr.
  • Patent number: 7887921
    Abstract: A laminated glass unit having at least two sheets of glass separated and bonded by a polymeric interlayer material, and further having multi-layer thin film coatings on each of the unbonded surfaces of the at least two glass sheets, is disclosed. Two or more of such laminated glass units can be utilized in various configurations to form an insulated glass unit. The thin films deposited on the unbonded glass surfaces have anti-reflective, iridescence-suppressing and solar control properties when suitable configurations, materials and layer thicknesses are chosen. The laminated glass unit and insulated glass units of the invention exhibit an excellent combination of low visible light reflectance and thermal insulating properties.
    Type: Grant
    Filed: February 22, 2006
    Date of Patent: February 15, 2011
    Assignee: Pilkington North America, Inc.
    Inventors: Srikanth Varanasi, David A. Strickler
  • Patent number: 7875357
    Abstract: A multi-layer, low-emissivity, solar control article comprises a dielectric substrate, a first dielectric metal oxide layer deposited on the substrate, a first highly conductive, silver-free metal oxide layer deposited on the first dielectric metal oxide, and a second dielectric metal oxide deposited on the first highly conductive, silver-free metal oxide layer. The aforementioned coating layer sequence may be repeated as necessary to achieve the desired properties. An iridescence suppressing interlayer may, optionally, be utilized in connection with the low-emissivity, solar control coating.
    Type: Grant
    Filed: July 25, 2006
    Date of Patent: January 25, 2011
    Assignee: Pilkington North America, Inc.
    Inventors: David A. Strickler, Srikanth Varanasi
  • Publication number: 20090214858
    Abstract: An atmospheric chemical vapor deposition process for laying down a magnesium oxide coating on a moving glass substrate through the reaction of an organic ester and an organomagnesium compound. The resulting article has a magnesium oxide coating which can be of substantial thickness because of the high deposition rates attainable with the novel process. Preferably, the coating deposition rates resulting from the method of the present invention may be greater than or equal to 15 ? per second.
    Type: Application
    Filed: February 25, 2008
    Publication date: August 27, 2009
    Inventors: Srikanth Varanasi, David A. Strickler
  • Publication number: 20090197096
    Abstract: A multi-layer, low-emissivity, solar control article comprises a dielectric substrate, a first dielectric metal oxide layer deposited on the substrate, a first highly conductive, silver-free metal oxide layer deposited on the first dielectric metal oxide, and a second dielectric metal oxide deposited on the first highly conductive, silver-free metal oxide layer. The aforementioned coating layer sequence may be repeated as necessary to achieve the desired properties. An iridescence suppressing interlayer may, optionally, be utilized in connection with the low-emissivity, solar control coating.
    Type: Application
    Filed: July 25, 2006
    Publication date: August 6, 2009
    Inventors: David A Strickler, Srikanth Varanasi
  • Publication number: 20070281168
    Abstract: A multi-layer thin film having as a primary component, a coating of highly doped zinc oxide, and optionally, a color suppression underlayer and a protective metal oxide overcoat. The film stack is preferably deposited on a transparent substrate by atmospheric chemical vapor deposition. The film stack exhibits a desirable combination of properties including high visible light transmittance, relatively low solar energy transmittance, low emissivity, and high solar selectivity.
    Type: Application
    Filed: June 4, 2007
    Publication date: December 6, 2007
    Inventors: Srikanth Varanasi, David Strickler
  • Patent number: 7223441
    Abstract: A chemical vapor deposition process for laying down a gallium oxide coating on a glass substrate through the use of an organic ester and an inorganic gallium halide. The organic ester preferably contains 3-6 carbon atoms which contributes to obtaining a high deposition rate. The chemical vapor deposition method to form the gallium oxide coating is preferably at, essentially, atmospheric pressure. The resulting article has a gallium oxide coating which can be of substantial thickness because of the high deposition rates attainable. The coating deposition rates resulting from the method of the present invention are preferably greater than or equal to 75 ? per second.
    Type: Grant
    Filed: March 10, 2004
    Date of Patent: May 29, 2007
    Assignee: Pilkington North America, Inc.
    Inventors: Michael P. Remington, Jr., David A. Strickler, Srikanth Varanasi
  • Patent number: 7211513
    Abstract: Nitrogen doped titanium oxide coatings on a hot glass substrate are prepared by providing a uniform vaporized reactant mixture containing a titanium compound, a nitrogen compound and an oxygen-containing compound, and delivering the reactant mixture to the surface of a ribbon of hot glass, where the compounds react to form a nitrogen doped titanium oxide coating. The nitrogen doped titanium oxide coatings deposited in accordance with the invention demonstrate an increase in visible light absorption.
    Type: Grant
    Filed: April 15, 2004
    Date of Patent: May 1, 2007
    Assignee: Pilkington North America, Inc.
    Inventors: Michael R. Remington, Jr., Srikanth Varanasi, David A. Strickler
  • Patent number: 7160578
    Abstract: A chemical vapor deposition process for laying down an aluminum oxide coating on a glass substrate through the use of an organic ester having a ? hydrogen on the alkyl group bonded to the carboxylate oxygen and an inorganic aluminum halide. The resulting article has an aluminum oxide coating which can be of substantial thickness because of the high deposition rates attainable with the novel process. Preferably, the coating deposition rates resulting from the method of the present invention may be greater than or equal to 200 ? per second.
    Type: Grant
    Filed: March 10, 2004
    Date of Patent: January 9, 2007
    Assignee: Pilkington North America
    Inventors: Michael P. Remington, Jr., David A. Strickler, Srikanth Varanasi
  • Publication number: 20060188730
    Abstract: A laminated glass unit having at least two sheets of glass separated and bonded by a polymeric interlayer material, and further having multi-layer thin film coatings on each of the unbonded surfaces of the at least two glass sheets, is disclosed. Two or more of such laminated glass units can be utilized in various configurations to form an insulated glass unit. The thin films deposited on the unbonded glass surfaces have anti-reflective, iridescence-suppressing and solar control properties when suitable configurations, materials and layer thicknesses are chosen. The laminated glass unit and insulated glass units of the invention exhibit an excellent combination of low visible light reflectance and thermal insulating properties.
    Type: Application
    Filed: February 22, 2006
    Publication date: August 24, 2006
    Inventors: Srikanth Varanasi, David Strickler
  • Publication number: 20050202170
    Abstract: A chemical vapor deposition process for laying down a gallium oxide coating on a glass substrate through the use of an organic ester and an inorganic gallium halide. The organic ester preferably contains 3-6 carbon atoms which contributes to obtaining a high deposition rate. The chemical vapor deposition method to form the gallium oxide coating is preferably at, essentially, atmospheric pressure. The resulting article has a gallium oxide coating which can be of substantial thickness because of the high deposition rates attainable. The coating deposition rates resulting from the method of the present invention are preferably greater than or equal to 75 ? per second.
    Type: Application
    Filed: March 10, 2004
    Publication date: September 15, 2005
    Inventors: Michael Remington, David Strickler, Srikanth Varanasi
  • Publication number: 20050202169
    Abstract: A chemical vapor deposition process for laying down an aluminum oxide coating on a glass substrate through the use of an organic ester having a ? hydrogen on the alkyl group bonded to the carboxylate oxygen and an inorganic aluminum halide. The resulting article has an aluminum oxide coating which can be of substantial thickness because of the high deposition rates attainable with the novel process. Preferably, the coating deposition rates resulting from the method of the present invention may be greater than or equal to 200 ? per second.
    Type: Application
    Filed: March 10, 2004
    Publication date: September 15, 2005
    Inventors: Michael Remington, David Strickler, Srikanth Varanasi
  • Publication number: 20050164011
    Abstract: A method is defined for producing an iron oxide coating on a glass article. The article is preferably for use as an architectural glazing. The method includes providing a heated glass substrate having a surface on which the coating is to be deposited. Ferrocene and an oxidant are directed toward and along the surface to be coated, and the ferrocene and the oxidant are reacted at or near the surface of the glass substrate to form an iron oxide coating.
    Type: Application
    Filed: January 26, 2004
    Publication date: July 28, 2005
    Inventors: Srikanth Varanasi, Michael Remington
  • Patent number: RE43388
    Abstract: A multi-layer, low-emissivity, solar control article comprises a dielectric substrate, a first dielectric metal oxide layer deposited on the substrate, a first highly conductive, silver-free metal oxide layer deposited on the first dielectric metal oxide, and a second dielectric metal oxide deposited on the first highly conductive, silver-free metal oxide layer. The aforementioned coating layer sequence may be repeated as necessary to achieve the desired properties. An iridescence suppressing interlayer may, optionally, be utilized in connection with the low-emissivity, solar control coating.
    Type: Grant
    Filed: July 25, 2006
    Date of Patent: May 15, 2012
    Assignee: Pilkington North America, Inc.
    Inventors: David A. Strickler, Srikanth Varanasi