Patents by Inventor David W. Sutcliffe

David W. Sutcliffe 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 energizing a printhead
    Patent number: 4848943
    Abstract: A method and apparatus for energizing a printhead by maintaining substantially constant peak current in the actuator means of the printhead regardless of the duty cycle of the actuator means. The method and apparatus establishes a minimum time period for energizing the actuator means and a supplemental time period for energizing the actuator means in response to the determined duty cycle. The actuator means are then energized for an extended time period in dependence upon the minimum time period and the established supplemental time period to thereby maintain substantially constant peak current in the actuator means regardless of the duty cycle thereof.
    Type: Grant
    Filed: April 13, 1987
    Date of Patent: July 18, 1989
    Assignee: Micro Peripherals
    Inventor: David W. Sutcliffe