When can maintenance fees for utility patents be paid?

Maintenance fees for utility patents can be paid during specific time periods as outlined in MPEP 2506: Window Period: Fees can be paid without surcharge during the 6-month periods preceding each due date, as defined in 35 U.S.C. 41(b). Grace Period: Fees can be paid with a surcharge during the 6-month periods immediately following each…

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