Can I pay the annual patent fee in advance?

yes. The patent fee is paid every year, and the date of payment is also stipulated, and it must be paid on the date of patent application. If something can't be paid on time, the annual fee can be paid one month in advance. In case of emergency, it's best to pay it in advance, or find an agency to pay it. Recommend something that I think is easy to use and not expensive. Search the flying leopard chain and try it out.