Patents by Inventor William Thomas Warner

William Thomas Warner 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: 6264300
    Abstract: A method of printing with an ink jet printer uses inks of the same hue but of different saturation. The method utilizes a single dither array to control the printing application of the ink, preferably a full strength ink and a dilute ink to achieve gray scale printing. The dither array has threshold values defined for a subset of values of the range of pixel values of an image area, preferably 50% thereof, corresponding generally to threshold values between 0 and 127 inclusive. Pixel values are determined to be either within or outside of the threshold array range. Consequently, an ink dot is either printed or not, utilizing either the dilute or full strength ink. When the pixel value is within the threshold array range, the pixel value is then compared to the threshold value of the overlaid cell of the dither array. Where the pixel value is greater than the corresponding threshold value, an ink dot is printed utilizing dilute ink, else no dot is printed.
    Type: Grant
    Filed: June 4, 1999
    Date of Patent: July 24, 2001
    Assignee: Lexmark International, Inc.
    Inventor: William Thomas Warner