Q: When does a patent have to be renewed from filed date or date of patent i forget
Not sure when time goes by date filed or date granted and how iften again 3 years 7 and 12?
Maintenance fee window opens 3 years from issue date of patent. The window closes 4 years from the issue date. The process repeats at year 7 and year 11.
Purposeful failure to renew causes the patent to lapse. Unintentional failure to pay during the window can be fixed with payment of an additional fee.
I hope that this helps.
Kevin E Flynn
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