Patents by Inventor John L. Ingraham

John L. Ingraham 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).

  • Dot on dot ink jet printing using inks of differing densities
    Patent number: 5625397
    Abstract: An ink jet printer comprising a plurality of ink jets arranged for dot-on-dot continuous ink jet printing, at least two of said plurality of ink jets being supplied with ink of the same dye and different densities. A printed article and a method of printing are also disclosed.
    Type: Grant
    Filed: November 23, 1994
    Date of Patent: April 29, 1997
    Assignee: Iris Graphics, Inc.
    Inventors: Donald R. Allred, John L. Ingraham, Foster M. Fargo
  • Apparatus and method for producing color half-tone images
    Patent number: 5416612
    Abstract: A method and apparatus for producing a color half-tone image from a digital data file are disclosed. The method includes the step of filling a pattern of dots for each of a plurality of colors, wherein the configuration and size of dots in a macropixel varies as a function of input density for each of the plurality of colors. The step of filling includes the step of producing a plurality of multiple droplet dots in less than the total available pixel locations in a macropixel in at least part of a range of input densities. The apparatus performs the operations of the method. The pixels are of variable size as a function of the number of droplets deposited at the pixel locations.
    Type: Grant
    Filed: November 6, 1992
    Date of Patent: May 16, 1995
    Assignee: Iris Graphics Inc.
    Inventors: John L. Ingraham, Foster M. Fargo, Jr., James M. Enge