Thelma Catherine `` Pat '' Ryan Nixon ( March 16 , 1912 - June 22 , 1993 ) was the wife of Richard Nixon , 37th President of the United States , and thus First Lady of the United States from 1969 to 1974 .
Patricia Ryan Nixon ( March 16 , 1912 - June 22 , 1993 ) was the wife of Richard Nixon and served as the First Lady of the United States from 1969 to 1974 and Second Lady of the United States from 1953 to 1961 .