To keep a utility patent in force at the United States Patent and Trademark Office (USPTO), the Patentee is required to pay patent maintenance fees at intervals of 3 1/2, 7 1/2, and 11 1/2 years from the date of the original patent grant. (see MPEP 2501 – Maintenance Fees) Additionally, the specific fee amounts ((980/2480/4110) - USPTO Fee [...]