It is better to find an agency for patent application, because there are many professional words involved in writing patent cases, and the patent application agency has professionals to help you write patent cases, and there are many stages in the application process, so it is very easy to miss the time if you apply yourself, so it is wise to choose an agency;
The late charge of patent application agency mainly depends on what kind of patent application process agency you choose. Different organizations charge different fees. Baidu searches for inevitable intellectual property rights, or directly calls the following number to explain it in detail. The charging situation is transparent, mainly because I hope to help more friends solve the patent application problem.
I hope the above answers can help you.