Patents by Inventor Timotny A. Pletcher

Timotny A. Pletcher 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).

  • Method and apparatus for controlling an electrochromic device
    Patent number: 5973819
    Abstract: The invention comprises an apparatus and methodology facilitating an accurate, user-friendly system for controlling the charge state (i.e., color level) of an electrochromic device. The invention provides a two button control methodology implemented as a sequential logic controller or, in another embodiment, a microprocessor-based controller. After initiation via, e.g., an external switch, the invention iteratively modifies and measures a charge level of the electrochromic device until an additional switch activation or until a maximal or minimal charge level is achieved.
    Type: Grant
    Filed: September 21, 1998
    Date of Patent: October 26, 1999
    Assignee: PPG Industries Ohio, Inc.
    Inventors: Timotny A. Pletcher, Walter P. Sjursen