1. Directly call the customer service number of the Patent Office (can be found online);
2. Check the patent application date, determine the payment time based on the application date, and pay before the expiration date ;
3. If you entrust an agency, you can also inquire directly with the agency;
4. Patent payment includes application fee, invention substantive examination fee, reexamination fee and bibliographic change fee, etc. . Applicants requesting restoration of rights or extension of patent term need to pay corresponding fees. The party concerned may request a refund within three years from the date of payment for patent fees that have been overpaid, repaid, or paid in error. If the applicant or patentee really has difficulty paying patent fees, he or she may request for a deferral. The patent period is based on annual units, and annual fees need to be paid; if the payment is not made on time or the payment is insufficient, the payment must be made in time and a late fee must be paid.