All utility patents that issued by the U.S. Patent and Trademark Office (“USPTO”) from applications filed on or after December 12, 1980 are subject to maintenance fees, which must be paid to maintain the patent in force. Information regarding which patents are subject to maintenance fees and the time of payment for maintenance fees is found in Chapter 2500: Maintenance Fees of the Manual of Patent Examining Procedure.
Maintenance fees are due three times during the life of a patent, and may be paid without surcharge at:
• Three to three and a half years after the date of issue for the first payment;