Patents by Inventor George W. Barnstead

George W. Barnstead 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).

  • Patent number: 5321430
    Abstract: An apparatus and method for improving the printing and edge enhancement of laser printers comprises a video clock counter, an input selector, a calibration selector, a mode selector, a decoding array, a register, memory and an address counter. The gray and edge enhancement circuit modifies the data received from the laser print controller to smooth edges in the image sent to the laser. The present invention compares each pixel and surrounding pixels in an area seven pixels wide and seven pixels long to correction bit patterns. If a match is found the pixels are modified to enhance any edges defined by the pixels. The gray and edge enhancement circuit also includes an operating mode in which shades of gray may be printed with a resolution of 150 dpi. The circuit uses the decoding array to pulse width modify the input data to various shades of gray.
    Type: Grant
    Filed: May 8, 1991
    Date of Patent: June 14, 1994
    Assignee: Acer Incorporated
    Inventors: George W. Barnstead, John T. O'Neil