Patents by Inventor Erik Tobiason

Erik Tobiason 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 controlling color of a printing press based upon colorimetric density differences
    Patent number: 6802254
    Abstract: When a color-difference exceeds an established color tolerance, spectral reflectance values of a test area are converted to colorimetric densities and compared with target colorimetric density values for the corresponding test area from which a colorimetric density difference is established. The colorimetric density difference is utilized to determine an ink correction value.
    Type: Grant
    Filed: December 5, 2001
    Date of Patent: October 12, 2004
    Assignee: Delaware Capital Formation, Inc.
    Inventors: David Brydges, Erik Tobiason
  • Spectral color control method
    Patent number: 6564714
    Abstract: A method for controlling color on press during printing utilizing spectral measurements is disclosed. When a color-difference is exceeded the measured spectral reflectance values of a test area are compared with the corresponding target reflectance values from which a spectral reflectance difference is established. A linear equation is used to relate the spectral reflectance difference to solid ink density or ink layer thickness differences for ink regulation utilizing an on-line empirically established correction matrix such that the spectral reflectance difference is minimized. The control method is applicable to both process and non-process colors.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: May 20, 2003
    Assignee: Delaware Capital Formation, Inc.
    Inventors: David Brydges, Erik Tobiason
  • Method and apparatus for controlling color of a printing press based upon colorimetric density differences
    Publication number: 20020124757
    Abstract: When a color-difference exceeds an established color tolerance, spectral reflectance values of a test area are converted to colorimetric densities and compared with target colorimetric density values for the corresponding test area from which a colorimetric density difference is established. The colorimetric density difference is utilized to determine an ink correction value.
    Type: Application
    Filed: December 5, 2001
    Publication date: September 12, 2002
    Inventors: David Brydges, Erik Tobiason
  • Spectral color control method
    Publication number: 20020104457
    Abstract: A method for controlling color on press during printing utilizing spectral measurements is disclosed. When a color-difference is exceeded the measured spectral reflectance values of a test area are compared with the corresponding target reflectance values from which a spectral reflectance difference is established. A linear equation is used to relate the spectral reflectance difference to solid ink density or ink layer thickness differences for ink regulation utilizing an on-line empirically established correction matrix such that the spectral reflectance difference is minimized. The control method is applicable to both process and non-process colors.
    Type: Application
    Filed: July 26, 2001
    Publication date: August 8, 2002
    Inventors: David Brydges, Erik Tobiason