Patents by Inventor Vaughan R. Pratt

Vaughan R. Pratt 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 adaptive forward differencing in the rendering of curves and surfaces
    Patent number: 5125073
    Abstract: An adaptive forward differencing apparatus wherein, when rendering curves, calculated x, y values are increased or decreased in order to create values which correspond to the next pixel of the display CRT, such that curves of substantially one pixel increments are continuously and uniformly generated. The apparatus also provides circuitry for generating coordinates of display elements which approximate an ideal vector and to define curves, vectors or objects within maximum and minimum coordinates of the CRT display. The present invention also provides efficient circuitry for computing the value of 1/w of the homogenous coordinate w.
    Type: Grant
    Filed: November 8, 1989
    Date of Patent: June 23, 1992
    Assignee: Sun Microsystems, Inc.
    Inventors: Sheue-Ling Lien, Michael J. Shantz, Serdar Ergene, Vaughan R. Pratt, Jerald R. Evans