Patents Examined by Kandasamt Thangavelu
  • Dynamic computation of ESD guidelines
    Patent number: 7558720
    Abstract: An automated method for checking electrostatic discharge (ESD) guidelines ensures that a sufficient number of ESD protection cells have been provided in the neighborhood of each pad in an integrated circuit design to ensure adequate current sinking and voltage clamping during the occurrence of an ESD event.
    Type: Grant
    Filed: January 9, 2006
    Date of Patent: July 7, 2009
    Assignee: National Semiconductor Corporation
    Inventors: Rajesh R. Berigei, Elroy Lucero, Sury Maturi, Marcel A. ter Beek
  • Method and interface elements for finite-element fracture analysis
    Patent number: 7505885
    Abstract: A finite element method for predicting crack opening and propagation entails defining a succession of overlapping interface elements at a potential crack plane, each element having a bound node pair and side node pairs spaced from the bound node pair to sense approach of a crack. An energy-based fracture mechanics criterion determines whether release occurs at the bound nodes and, if so, the displacement between the bound nodes is calculated based on a strain softening law. The process is repeated for each element in sequence.
    Type: Grant
    Filed: January 24, 2003
    Date of Patent: March 17, 2009
    Assignee: The Boeing Company
    Inventors: Lyle R. Deobald, Bernhard Dopker, Gerald E. Mabson