Patents by Inventor John F. Hamilton

John F. Hamilton 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: 4918622
    Abstract: A digital screener for digitally converting a continuous tone color separation into a corresponding high resolution, bit-mapped, raster scanned halftone separation of an original artwork which utilizes a contone line buffer (913), an image handler (930), a screen handler (950), and a font memory (970). For every successive micro raster that is to occur in the screened image, the screen handler repetitively generates appropriate sampling coordinates, using predefined fast and slow scan incremental values, in order to sample any of the halftone reference patterns along successively positioned angled sampling lines (710, 730) that collectively form an angled grid so as to provide a bit-mapped halftone image pattern oriented at a desired screen angle. The font memory stores a different halftone dot pattern for each different contone value.
    Type: Grant
    Filed: November 16, 1988
    Date of Patent: April 17, 1990
    Assignee: Eastman Kodak Company
    Inventors: Edward M. Granger, John F. Hamilton, Jr., Larry G. Wash
  • Patent number: D259978
    Type: Grant
    Filed: March 12, 1979
    Date of Patent: July 28, 1981
    Inventor: John F. Hamilton, Sr.