Patents by Inventor Mark N. Hepworth

Mark N. Hepworth 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).

  • Arbitrary raster blanking circuit
    Patent number: 4663618
    Abstract: An apparatus is disclosed for displaying arbitrary forms on a raster-scanned cathode ray tube converting the analog X and Y deflection voltages of the raster signal directly into a digital TTL level blanking signal. The circuit designer, utilizing cartesian or polar coordinates, specifies a desired shape and its location utilizing the appropriate formulas. In this manner, a number of raster cut-out circuits are readily coupled to define a desired number of arbitrary shapes on a raster scanned cathode ray tube.
    Type: Grant
    Filed: December 22, 1983
    Date of Patent: May 5, 1987
    Assignee: Rockwell International Corporation
    Inventors: Donald G. Hayles, Mark N. Hepworth
  • Background raster generator
    Patent number: 4598236
    Abstract: A raster generator circuit is disclosed for a cathode ray tube display having a fixed efficiency at any desired raster scan rate. eliminating external clock dependency for synchronization ahd having a fixed efficiency. The circuit generates a raster signal having a self-adjusting line density corresponding to the time allowed for rastering a complete screen.
    Type: Grant
    Filed: December 22, 1983
    Date of Patent: July 1, 1986
    Assignee: Rockwell International Corporation
    Inventor: Mark N. Hepworth
  • Activity monitor, power-on clear circuit
    Patent number: 4572966
    Abstract: A power-on clear circuit is disclosed with a repetitive reset output for use with a microprocessor having a "heartbeat" activity monitor. The reset output is repeated at specified intervals until the activity monitor is sensed, at which time the reset output is disabled until the activity monitor is no longer detected.
    Type: Grant
    Filed: December 22, 1983
    Date of Patent: February 25, 1986
    Assignee: Rockwell International Corporation
    Inventor: Mark N. Hepworth