Remember to write down the patent number and several patent fees to be paid, such as: change fee 250, annual fee for the nth year ... If you want to pay in person, you can pay directly at the agency, which is convenient and quick, and you can get the payment receipt on the spot. However, if you pay on the spot, it will take a little longer to enter the system, and you can apply for an electronic account yourself. If it is a patent, it is also convenient to ask an agency to help you submit it.