Patents by Inventor Marc Ast

Marc Ast 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).

  • Electrochromic system and its supply process
    Patent number: 5694144
    Abstract: Electrochromic systems having a material, whose coloration state and/or the transmission in certain electromagnetic radiation wavelengths varies by performing an electrochemical reaction involving the passage of an electric current. The electric current is generated by an intensity generator able to supply a current, whose intensity obeys a reference value determined as a function of the number of charges to be transferred for switching from the initial coloration state to the desired coloration state and as a function of the time chosen for the switching. The system also relates to using a power supply in an electrochromic glazing process.
    Type: Grant
    Filed: May 15, 1995
    Date of Patent: December 2, 1997
    Assignee: Saint-Gobain Vitrage
    Inventors: Christine Lefrou, Marc Ast
  • Electrochromic system with measurement of charge to be transferred
    Patent number: 5365365
    Abstract: An electrochromic system for controlling the color state of an electrochromic pane. The charge needed to obtain the desired color is determined from the discharge potential of the system and the coloration set-point. An integrator measures the charge passing through the system and compares it to the charge to be transferred. This charge is measured by a differential amplifier which compares a discharge potential measured by a capacitor with a selected color set-point.
    Type: Grant
    Filed: April 29, 1993
    Date of Patent: November 15, 1994
    Assignee: Saint Gobain Vitrage International
    Inventors: Xavier Ripoche, Marc Ast