Joseph pleaded guilty to assault causing grievous bodily harm without intent.
On Thursday (January 29) at Peterborough Crown Court, Joseph was ordered to complete an additional six months in prison on top of his existing sentence.
DC Shelly Reeve said: “Joseph’s behaviour on that day was despicable. He attacked someone who was simply trying to do his job.
“Staff were under increased pressure due to the earlier incident which led to the lockdown and to attack one of them in this way was simply unacceptable.”
The Whitemoor attack happened when the prison was put into lockdown due to an incident on January 11 last year.