USS Patriot (PYc-47), formerly the Katoura, was built in 1930 by the Herreshoff Manufacturing Company in Bristol, Rhode Island United States and purchased by the United States Navy, for $1.00, from Mr. A. Loomis of New York City on 20 September 1940, She was converted for Navy service as a submarine chaser at the Greenport Basin and Construction Company at Greenport, New York and designated PC–455 on 4 November 1940. She was placed in service 27 February 1941.