A Douglas County judge has sentenced a 21-year-old Lawrence man to serve more than a year in prison for punching a person and firing a gun outside a Lawrence restaurant in April.

District Judge Paula Martin on Thursday ordered Stephen R. Patterson to spend 16 months in prison.

Patterson, who pleaded guilty in July to aggravated assault, also will serve six months for battery and 11 months for an earlier cocaine possession charge. Those two sentences will be served at the same time as the 16-month sentence.

Prosecutors say Patterson hit a 21-year-old Kansas University student in the face, pulled a handgun on another person and then fired a round in the air. The incident occurred April 19 in the drive-through lane of Burrito King, 900 Ill., after Patterson rear-ended another car whose occupants were ordering food.

At the time of the incident, Patterson was out of jail on bond for the July 2008 cocaine possession charge. Douglas County District Attorney Charles Branson said Patterson must register as a violent offender because he used a gun during the crime.