It depends on a number of factors including:
what type of patent (design, utility, plant, etc),
when it was filed (its earliest priority date),
when it was issued,
where it was issued (which...
the last supper last when jesus says one of you will betray me then the followers were asking if it was "me" or "me" jesus told them you know who you are then when jesus went to pray in a queit place...