1`Patent protection starts from the date of application. If the application for authorization in 2011 is 12 years old, 2011 is considered the first year, and the annual fee does not need to be paid for this year
2. Generally, the bureau does not encourage paying annual fees twice. There are cases where it can be postponed to the next year. However, if the fees you pay cannot meet the annual fee for the next year, it will be deemed as unpaid. In addition, it is better to call to confirm
3. The three years before the fee reduction is the first three years of payment. In your case, the 2nd, 3rd and 4th years are all post-mitigation fees