Bishop, who was found guilty on four counts of wounding, was given three further concurrent life sentences for wounding Mr Knox's friends.
Sentencing, Mr Justice Bean told Bishop that he was a highly dangerous man.
“I do not think it is proved that you intended to kill Robert Knox. The truth is that you simply could not care less whether you killed him or not,” he said.
“Your lack of regret let alone remorse was truly chilling”.