How long does a patent last and how can I keep it in force?
What is Patent Annuity?
What is a Patent Maintenance Fee?
What is a Patent Renewal?
When are U.S. patent renewal fees due?
When are patent annuity fees due in Europe?
When are annuity or renewal fees due for other international patents?
When are Canadian patent renewal fees due?
What does entity status mean for the purpose of maintaining a U.S. patent?
What if the patent maintenance entity status is wrong? Can I change it?