Patents by Inventor Gerald Bruce Poe

Gerald Bruce Poe 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).

  • Reflectance control of an electrochromic element using a variable duty cycle drive
    Patent number: 6084700
    Abstract: An electronic circuit for an electrochromic element. In order to improve the response time of the electrochromic element and reduce the cost and complexity, a modulated signal, such as a pulse width modulated (PWM) signal is coupled to the electrochromic element without signal averaging. In order to compensate for the compressed operating range of the reflectance characteristic under such conditions, the electronic circuit in accordance with the present invention utilizes active loading or alternatively voltage feedback of the electrochromic element to provide a reflectance response characteristic with an uncompressed linear operating range similar to a reflectance characteristic for an electrochromic element with a DC drive circuit.
    Type: Grant
    Filed: April 29, 1998
    Date of Patent: July 4, 2000
    Assignee: Gentex Corporation
    Inventors: Robert Charles Knapp, Robert Ralph Turnbull, Gerald Bruce Poe