Patents by Inventor C. Allan Heydon

C. Allan Heydon 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 for ignoring redundant constraints in a graphic editor
    Patent number: 6081268
    Abstract: Using an input device of a computer system, a graphic drawing is defined to include at least one graphic component. The graphic component is subject to a plurality of constraints. At least one of the constraints is redundant with respect to the other constraints. Approximate linear equations are substituted for the constraints. A subset of the equations are selected to determine a converging solution for the redundantly constrained graphic drawing.
    Type: Grant
    Filed: September 3, 1997
    Date of Patent: June 27, 2000
    Assignee: Digital Equipment Corporation
    Inventors: C. Allan Heydon, C. Gregory Nelson, Eric H. Veach