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).

  • Publication number: 20080014448
    Abstract: Certain embodiments of this invention relates to a coated article including a substrate (e.g., glass substrate) which supports a coating thereon, wherein the coating includes at least one layer of or including SbOxNy. This layer is desirable for blocking (reflection and/or absorption) of at least some ultraviolet (UV) radiation. In certain example embodiments of this invention, the layer of SbOxNy may be used as a dielectric layer in a low-E (low-emissivity) coating, and may improve UV-blocking capability of such a low-E coating. Coated articles in certain example embodiments of this invention may be used in the context of windows.
    Type: Application
    Filed: July 14, 2006
    Publication date: January 17, 2008
    Applicant: Guardian Industries Corp.
    Inventors: Yiwei Lu, Desaraju V. Varaprasad, John A. Vanderploeg
  • Patent number: 7274501
    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: Grant
    Filed: September 19, 2003
    Date of Patent: September 25, 2007
    Assignee: Donnelly Corporation
    Inventors: Ian A. McCabe, Hamid Habibi, Desaraju V. Varaprasad, Niall R. Lynam
  • Patent number: 7202987
    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: Grant
    Filed: October 1, 2004
    Date of Patent: April 10, 2007
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Mingtao Zhao, Craig Allen Dornan, Anoop Agrawal, Pierr-Marc Allemand, Niall R. Lynam
  • Patent number: 7004592
    Abstract: An electrochromic rearview mirror suitable for a motor vehicle is disclosed. The mirror includes a display device disposed behind the rear substrate.
    Type: Grant
    Filed: October 22, 2004
    Date of Patent: February 28, 2006
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Hamid Habibi, Ian A. McCabe, Niall R. Lynam, Mingtang Zhao, Craig A. Dornan
  • Publication number: 20060028730
    Abstract: An electrochromic rearview mirror element for a motor vehicle comprises a first substantially transparent front substrate having a first and a second surface (and with a substantially transparent conductive electrode on its second surface) and a rear substrate having a third and a fourth surface. The rear substrate is positioned in spaced-apart relationship with the front substrate and with its third surface opposing the second surface of the front substrate. A mirror reflector is disposed on the third surface and a seal is positioned toward a peripheral edge of the substrates forming a cavity therebetween. An electrochromic medium is disposed in the cavity. The mirror reflector preferably comprises a metal layer that reflects at least about 70% of visible light. A display device can be disposed behind the rear substrate.
    Type: Application
    Filed: October 6, 2005
    Publication date: February 9, 2006
    Applicant: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Hamid Habibi, Ian A. McCabe, Niall R. Lynam, Mingtang Zhao, Craig A. Dornan
  • Patent number: 6954300
    Abstract: The present invention relates to electrochromic polymeric solid films, manufacturing electrochromic devices using such solid films and processes for making such solid films and devices. The electrochromic polymeric solid films of the present invention exhibit beneficial properties and characteristics, especially when compared to known electrochromic media. The electrochromic polymeric solid films are transformed in situ from a low viscosity electrochromic monomer composition by exposure to electromagnetic radiation, and in so doing minimum shrinkage occurs. The electrochromic polymeric solid films of the present invention also perform well under prolonged coloration, outdoor weathering and all-climate exposure, and provide an inherent safety aspect not known to electrochromic media heretofore.
    Type: Grant
    Filed: April 17, 2001
    Date of Patent: October 11, 2005
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Mingtang Zhao, Craig Allen Dornan, Anoop Agrawal, Pierre-Marc Allemand, Niall R. Lynam
  • Patent number: 6855431
    Abstract: The present invention relates to electrochromic polymeric solid films, manufacturing electrochromic devices using such solid films and processes for making such solid films and devices. The electrochromic polymeric solid films of the present invention exhibit beneficial properties and characteristics, especially when compared to known electrochromic media. The electrochromic polymeric solid films are transformed in situ from a low viscosity electrochromic monomer composition by exposure to electromagnetic radiation, and in so doing minimum shrinkage occurs. The electrochromic polymeric solid films of the present invention also perform well under prolonged coloration, outdoor weathering and all-climate exposure, and provide an inherent safety aspect not known to electrochromic media heretofore.
    Type: Grant
    Filed: July 16, 2002
    Date of Patent: February 15, 2005
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Mingtang Zhao, Craig Allen Dornan, Anoop Agrawal, Pierr-Marc Allemand, Niall R. Lynam
  • Patent number: 6620454
    Abstract: Processes for making a transparent substrate having a glare reducing diffuser surface coating on its surface are disclosed to provide a touchscreen or a faceplate such as for attachment to a screen for a cathode ray tube or other display device. Preferably, the faceplate has at least one of a gloss reading of less than about 80 gloss units, and a resolution of at least about 3 lines per millimeter. The method includes coating at least one layer of a precursor solution onto a functional coating provided on at least one surface of the substrate, and firing the layer to form the faceplate having a diffuser surface coating on the functional coated substrate. Preferably, the precursor solution at least comprises a metal oxide precursor dissolved in an organic solvent. Also, the firing preferably occurs at a temperature of at least 250° C. The functional coating is preferably provided as a transparent conductive coating.
    Type: Grant
    Filed: August 23, 2002
    Date of Patent: September 16, 2003
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Craig A. Dornan, Catherine A. Getz
  • Publication number: 20030087107
    Abstract: The present invention relates to electrochromic polymeric solid films, manufacturing electrochromic devices using such solid films and processes for making such solid films and devices. The electrochromic polymeric solid films of the present invention exhibit beneficial properties and characteristics, especially when compared to known electrochromic media. The electrochromic polymeric solid films are transformed in situ from a low viscosity electrochromic monomer composition by exposure to electromagnetic radiation, and in so doing minimum shrinkage occurs. The electrochromic polymeric solid films of the present invention also perform well under prolonged coloration, outdoor weathering and all-climate exposure, and provide an inherent safety aspect not known to electrochromic media heretofore.
    Type: Application
    Filed: July 16, 2002
    Publication date: May 8, 2003
    Applicant: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Mingtao Zhao, Craig Allen Dornan, Anoop Agrawal, Pierr-Marc Allemand, Niall R. Lynam
  • Publication number: 20020197409
    Abstract: A transparent substrate having a glare reducing diffuser surface coating in which the coating has a thickness of less than about 3 microns. The diffuser surface coated substrate is bendable, overcoatable with functional coatings such as transparent conductor coatings, abrasion resistant, and generally serviceable for its intended use.
    Type: Application
    Filed: August 23, 2002
    Publication date: December 26, 2002
    Applicant: Donnelly Corporation, a Michigan corporation
    Inventors: Desaraju V. Varaprasad, Craig A. Dornan, Catherine A. Getz
  • Patent number: 6440491
    Abstract: Processes for making a transparent substrate having a glare reducing diffuser surface coating on its outer surface are disclosed to provide a faceplate such as for attachment to a screen for a cathode ray tube or other display device. Preferably, the coating has a thickness of less than about 3 microns and/or a gloss less than about 80 gloss units. The method includes spraying a precursor solution onto the substrate to form a preliminary coating, at least partially densifying that preliminary coating, spraying another coating of precursor solution onto the preliminary coating, and firing the coating to form a diffuser surface coating. Alternately, a precursor solution of an inorganic metal oxide dissolved in an organic solvent is sprayed on the substrate and fired at a temperature within the range of from about 250° C. to about 600° C. to form the diffuser surface coating.
    Type: Grant
    Filed: June 30, 2000
    Date of Patent: August 27, 2002
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Craig A. Dornan, Catherine A. Getz
  • Patent number: 6420036
    Abstract: The present invention relates to electrochromic ploymeric solid films, manufacturing electrochromic devices using such solid films and processes for making such solid films and devices. The electrochromic polymeric solid films of the present invention exhibit beneficial properties and characteristics, especially when compared to known electrochromic media. The electrochromic polymeric solid films are transformed in situ from a low viscosity electrochromic monomer composition by exposure to electromagnetic radiation, and in so doing minimum shrinkage occurs. The electrochromic polymeric solid films of the present invention also perform will under prolonged coloration, outdoor weathering and all-climate exposure, and provide an inherent safety aspect not known to electrochromic media heretofore.
    Type: Grant
    Filed: January 27, 2000
    Date of Patent: July 16, 2002
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Mingtang Zhao, Craig Allen Dornan, Anoop Agrawal, Pierr-Marc Allemand, Niall R. Lynam
  • Publication number: 20020041443
    Abstract: The present invention relates to electrochromic mirrors and devices whose electrochromic element is composed of an electrochromic solid film and an electrolyte comprising redox reaction promoters and alkali ions and/or protons.
    Type: Application
    Filed: September 18, 2001
    Publication date: April 11, 2002
    Inventors: Desaraju V. Varaprasad, Hamid Habibi, Ian A. McCabe, Niall R. Lynam, Mingtang Zhao, Craig A. Dornan
  • Publication number: 20020012156
    Abstract: The present invention relates to electrochromic polymeric solid films, manufacturing electrochromic devices using such solid films and processes for making such solid films and devices. The electrochromic polymeric solid films of the present invention exhibit beneficial properties and characteristics, especially when compared to known electrochromic media. The electrochromic polymeric solid films are transformed in situ from a low viscosity electrochromic monomer composition by exposure to electromagnetic radiation, and in so doing minimum shrinkage occurs. The electrochromic polymeric solid films of the present invention also perform well under prolonged coloration, outdoor weathering and all-climate exposure, and provide an inherent safety aspect not known to electrochromic media heretofore.
    Type: Application
    Filed: April 17, 2001
    Publication date: January 31, 2002
    Inventors: Desaraju V. Varaprasad, Mingtang Zhao, Craig Allen Dornan, Anoop Agrawal, Pierre-Marc Allemand, Niall R. Lynam
  • Publication number: 20010022357
    Abstract: An electrochemichromic solution containing novel viologen salts as cathodic materials for the redox pair.
    Type: Application
    Filed: June 5, 1997
    Publication date: September 20, 2001
    Inventors: PADMA DESARAJU, DESARAJU V. VARAPRASAD, NIALL R. LYNAM, HAMID R. HABIBI
  • Patent number: 6245262
    Abstract: The present invention relates to electrochromic polymeric solid films, manufacturing electrochromic devices using such solid films and processes for making such solid films and devices. The electrochromic polymeric solid films of the present invention exhibit beneficial properties and characteristics, especially when compared to known electrochromic media. The electrochromic polymeric solid films are transformed in situ from a low viscosity electrochromic monomer composition by exposure to electromagnetic radiation, and in so doing minimum shrinkage occurs. The electrochromic polymeric solid films of the present invention also perform well under prolonged coloration, outdoor weathering and all-climate exposure, and provide an inherent safety aspect not known to electrochromic media heretofore.
    Type: Grant
    Filed: February 18, 1999
    Date of Patent: June 12, 2001
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Mingtang Zhao, Craig Allen Dornan, Anoop Agrawal, Pierre-Marc Allemand, Niall R. Lynam
  • Patent number: 6207083
    Abstract: The specification discloses electrochemichromic solutions and devices based on the use of solvents comprising at least about 25% 3-hydroxypropionitrile, 3,3′-oxydipropionitrile, 2-acetylbutyrolactone, 2-methylglutaronitrile, 3-methylsulfolane and mixtures thereof. The specification also discloses vacuum backfilling techniques for filling electrochemichromic cells and enhanced UV stability through solvent self-screening.
    Type: Grant
    Filed: November 8, 1999
    Date of Patent: March 27, 2001
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Hamid R. Habibi, Niall R. Lynam, Padma Desaraju
  • Patent number: 6154306
    Abstract: The present invention relates to electrochromic polymeric solid films, manufacturing electrochromic devices using such solid films and processes for making such solid films and devices. The electrochromic polymeric solid films of the present invention exhibit beneficial properties and characteristics, especially when compared to known electrochromic media. The electrochromic polymeric solid films are transformed in situ from a low viscosity electrochromic monomer composition by exposure to electromagnetic radiation, and in so doing minimum shrinkage occurs. The electrochromic polymeric solid films of the present invention also perform well under prolonged coloration, outdoor weathering and all-climate exposure, and provide an inherent safety aspect not known to electrochromic media heretofore.
    Type: Grant
    Filed: July 12, 1999
    Date of Patent: November 28, 2000
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Mingtang Zhao, Craig Allen Dornan, Anoop Agrawal, Pierre-Marc Allemand, Niall R. Lynam
  • Patent number: 6087012
    Abstract: A transparent substrate having a glare reducing diffuser surface coating on its outer surface forms a faceplate for attachment to a screen for a cathode ray tube or other display device. The coating has a gloss less than about 80 gloss units, and the substrate may include an index matching adhesive/medium for attaching said faceplate to a cathode ray tube screen. The diffuser surface coated substrate is bendable, overcoatable with functional coatings such as transparent conductor coatings, abrasion resistant, and generally serviceable for its intended use.
    Type: Grant
    Filed: July 6, 1999
    Date of Patent: July 11, 2000
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Craig A. Dornan, Catherine A. Getz
  • Patent number: 6045724
    Abstract: The specification discloses electrochemichromic solutions and devices based on the use of solvents comprising at least about 25% 3-hydroxypropionitrile, 3,3'-oxydipropionitrile, 2-acetylbutyrolactone, 2-methylglutaronitrile, 3-methylsulfolane and mixtures thereof. The specification also discloses vacuum backfilling techniques for filling electrochemichromic cells and enhanced UV stability through solvent self-screening.
    Type: Grant
    Filed: March 5, 1998
    Date of Patent: April 4, 2000
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Hamid R. Habibi, Niall R. Lynam, Padma Desaraju