Was Patton ever a 5 star general?

No. He was a four star general. He may have become a 5 star general had he lived longer. However, in December of 1945 he was in a car accident and was paralyzed from the neck down. After a few weeks, he succumbed to his injuries. And there were 5 star generals at the time. Eisenhower, Marshall, and MacArthur were all 5 star generals.