How are maintenance fee due dates calculated for patents?
How are maintenance fee due dates calculated for patents? Maintenance fee due dates for patents are calculated based on the date the patent was granted. According to MPEP 2506: “Three maintenance fees as required by 35 U.S.C. 41(b) are due at 3 1/2, 7 1/2 and 11 1/2 years after the date of grant of…
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