Patents by Inventor William Henry Keehn, II

William Henry Keehn, II 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).

  • Contrast control for a backlit LCD
    Patent number: 5818553
    Abstract: A contrast controller for a liquid-crystal display maximizes the display contrast by using a light sensor to detect ambient light levels and light blocked by the LCD panel. The display contrast is maximized by maximizing the difference between the ambient and blocked light levels. Further contrast maximization is accomplished through variable control of the LCD backlight in accordance with sensed light levels.
    Type: Grant
    Filed: October 6, 1997
    Date of Patent: October 6, 1998
    Assignee: Norand Corporation
    Inventors: Steven E. Koenck, William Henry Keehn, II
  • Efficient electroluminescent backlight
    Patent number: 5798610
    Abstract: An efficient electrolumiescent light source for backlighting an LCD panel increases the intensity of light passing through the panel by concentrating light within that volume wherein the LCD panel is readable.
    Type: Grant
    Filed: April 4, 1995
    Date of Patent: August 25, 1998
    Inventors: Steven E. Koenck, William Henry Keehn, II
  • Combined energy and data storage system
    Patent number: 5714812
    Abstract: A data terminal utilizes a rotating flywheel system for energy storage and storage and retrieval. Energy storage and data storage systems are combined into a single system.
    Type: Grant
    Filed: April 14, 1995
    Date of Patent: February 3, 1998
    Assignee: Norand Corporation
    Inventors: Steven E. Koenck, William Henry Keehn, II