kingUS6131078Jun 23, 1999Oct 10, 2000Plaisted; David A.Method for design verification of hardware and non-hardware systemsUS6212669 *Nov 5, 1997Apr 3, 2001Fujitsu LimitedMethod for verifying and representing hardware by decomposition and partitioningUS6275976Feb 25, 1997Aug 14, 2001Joseph M. ScanduraAutomated method for building and maintaining software including methods for verifying that systems