How to calculate the annual fee of patent fee, and what is the calculation standard of annual fee of patent fee?

Annual fee payment: the annual fee for the year when the patent right is granted shall be paid at the same time as the registration formalities, and the annual fee for the future shall be paid before the expiration of the previous year. The expiration date of the payment period is the corresponding date of the application date of the current year. This annual fee can be paid by the applicant himself or by us. Fees and basis (1) Application fee for invention patent 900, utility model patent 5003, design patent 500 1, printing fee 502; (2) The maintenance fee for an application for a patent for invention is 300 yuan per year; (3) The examination fee for the application for a patent for invention is 2500 yuan; (4) Review fee 1, invention patent 10002, practicality. Design patent 300 (5) change fee of description 1, change of inventor, applicant and patentee in 2002, change of entrustment relationship between patent agency and agent 50 (6) priority claim fee 80 (7) recovery claim fee 1000 (8) revocation claim fee 1, invention patent right 30. Design patent 20 (9) invalidation request fee 1, invention patent 30002, utility model patent 15003, design patent 1500 (10), compulsory license request fee 1, invention patent 3002, and practicality. Printing fee 1, invention patent 2552, utility model patent 2053, design patent 205 (XIII) surcharge 1, first extension request fee of 300 yuan per month, second extension request fee of 20002 yuan per month, claim surcharge increased from item 654381. Add 50 per page (including the attached drawings in the specification) from page 306438 for utility model patent1-3,9006-8,20003 and design patent1-3,2000. Note: 1 has five fee waiver items, including application fee, invention maintenance fee, invention examination fee, reexamination fee and annual fee for three years after authorization. Three years after authorization, the reduction and exemption ratio of application fee, invention examination fee and annual fee is 70% for service inventions and 85% for non-service inventions, and the reduction and exemption ratio of invention maintenance fee and reexamination fee is 60% for service inventions and 80% for non-service inventions.