1.50/10 2007-08-01 60 minutes.HDContestants in Houston and Tampa continue pitching their inventions to the judges of American Inventor. Hopefuls will be vying for the $50,000 prize given to the winning inventor of each city. Among other inventions, a gizmo to entertain dogs with and a new lifesaving device will be showcased.An: 2007Studio: ABCPays: