Patents by Inventor Darla J. French

Darla J. French 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 compounds
    Patent number: 6037471
    Abstract: An improved electrochromic device, the device incorporating an electrochromic medium that comprises at least three electroactive materials having absorption spectra that add together such that the color of the electrochromic medium can be pre-selected by individually choosing the concentrations of the at least three electroactive materials. The electrochromic medium generally maintains the pre-selected perceived color throughout its normal range of voltages when used in an electrochromic device. The at least three electroactive materials include at least one electrochemically reducible material (cathodic material), at least one electrochemically oxidizable material (anodic material) and at least one additional electroactive material which may be either an anodic or cathodic material. Thus, there are always three electroactive materials present in the medium, with at least two either being anodic or cathodic materials.
    Type: Grant
    Filed: August 26, 1998
    Date of Patent: March 14, 2000
    Assignee: Gentex Corporation
    Inventors: Ramanujan Srinivasa, Darla J. French, Rongguang Lin, Thomas F. Guarr, Harlan J. Byker, Kelvin L. Baumann, David A. Theiste
  • Electrochromic compounds
    Patent number: 5998617
    Abstract: An improved electrochromic device, the device incorporating an electrochromic medium that comprises at least three electroactive materials having absorption spectra that add together such that the color of the electrochromic medium can be pre-selected by individually choosing the concentrations of the at least three electroactive materials. The electrochromic medium generally maintains the pre-selected perceived color throughout its normal range of voltages when used in an electrochromic device. The at least three electroactive materials include at least one electrochemically reducible material (cathodic material), at least one electrochemically oxidizable material (anodic material) and at least one additional electroactive material which may be either an anodic or cathodic material. Thus, there are always three electroactive materials present in the medium, with at least two either being anodic or cathodic materials.
    Type: Grant
    Filed: April 2, 1997
    Date of Patent: December 7, 1999
    Assignee: Gentex Corporation
    Inventors: Ramanujan Srinivasa, Darla J. French, Rongguang Lin, Thomas F. Guarr, Harlan J. Byker, Kelvin L. Baumann, David A. Theiste