Patents by Inventor Padma Desaraju

Padma Desaraju 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).

  • ELECTROCHEMICHROMIC VIOLOGENS
    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
  • Method for filling large area electrochromic windows
    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
  • Large area electrochromic window
    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
  • Electrochromic architectural window
    Patent number: 5725809
    Abstract: A variable transmission electrochromic architectural window includes spaced optically transparent elements confining an electrochromic medium including a solvent and a redox chemical pair in solution such that the redox chemical pair colors under the application of voltage and bleaches in the absence of the applied voltage. An ultraviolet stabilizer is included in solution for enhanced ultraviolet stability. The window has an electrochromically active large area of length dimension at least about 14 cm and a width dimension at least about 14 cm while exhibiting a steady state leakage current of less than about 2.68 amperes per square meter when a potential of one volt is applied such that coloration uniformity of the electrochromic architectural window is enhanced. Preferably, the electrochromic medium is 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.
    Type: Grant
    Filed: October 17, 1996
    Date of Patent: March 10, 1998
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Niall R. Lynam, Hamid R. Habibi, Padma Desaraju
  • Electrochemichromic mirror
    Patent number: 5567360
    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: December 4, 1995
    Date of Patent: October 22, 1996
    Inventors: Desaraju V. Varaprasad, Niall R. Lynam, Hamid R. Habibi, Padma Desaraju
  • Electrochemichromic sunroof
    Patent number: 5472643
    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: August 12, 1994
    Date of Patent: December 5, 1995
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Niall R. Lynam, Hamid R. Habibi, Padma Desaraju
  • High performance electrochemichromic solutions and devices thereof
    Patent number: 5340503
    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: May 4, 1992
    Date of Patent: August 23, 1994
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Niall R. Lynam, Hamid R. Habibi, Padma Desaraju
  • Method for reducing current leakage and enhancing UV stability in electrochemichromic solutions and devices
    Patent number: 5151816
    Abstract: The specification discloses a method for reducing current leakage and enhancing UV stability by using electrochemichromic solutions whose solvents include, either solely or in combination with other solvents, glutaronitrile (GNT).
    Type: Grant
    Filed: December 29, 1989
    Date of Patent: September 29, 1992
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Hamid R. Habibi, Niall R. Lynam, Padma Desaraju
  • Linear polyether-containing electrochemichromic solutions and related devices
    Patent number: 5145609
    Abstract: The specification discloses electrochemichromic solutions and devices based on the use of from about 0.5 percent by volume of at least one linear polyether which is soluble in the electrochemichromic solution to reduce segregation without unduly affecting leakage current.
    Type: Grant
    Filed: November 7, 1990
    Date of Patent: September 8, 1992
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Niall R. Lynam, Hamid R. Habibi, Padma Desaraju
  • Method of reducing leakage current in electrochemichromic solutions and solutions based thereon
    Patent number: 5142407
    Abstract: The specification discloses electrochemichromic solutions and devices based on the use of from about 5% by volume of a nonpolymeric material having a high volume resistivity and high dielectric constant to reduce leakage current without unduly increasing solution viscosity. In an alternative aspect, high quantities of such materials are used even though solution viscosity increases to the point of preventing room temperature vacuum backfilling in order to take advantage of other features of such solutions.
    Type: Grant
    Filed: December 22, 1989
    Date of Patent: August 25, 1992
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Hamid R. Habibi, Niall R. Lynam, Padma Desaraju
  • High performance electrochemichromic solutions and devices thereof
    Patent number: 5140455
    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 29, 1989
    Date of Patent: August 18, 1992
    Assignee: Donnelly Corporation
    Inventors: Desaraju V. Varaprasad, Niall R. Lynam, Hamid R. Habibi, Padma Desaraju