UPDATE 1-U.S. OKs $1.75 bln sale of Patriot PAC-3 missiles to Saudi Arabia

WASHINGTON, Oct 1 (Reuters) - The U.S. State Department has approved a $1.75 billion sale to Saudi Arabia to upgrade its Patriot air defense system with PAC-3 missiles, a deal that would benefit Lockheed Martin Corp and Raytheon Co , the Pentagon said Wednesday.