In favor: the invention and utility model are applied at the same time, and the general utility model can be authorized first. The invention may not be authorized. When the invention cannot be authorized, at least the utility model patent certificate can be obtained. When the invention can be authorized after substantive examination, if the utility model is abandoned, the invention patent can be obtained. The protection period of invention patents is longer than that of utility model patents, and the stability of patents (that is, the possibility of being declared invalid is lower) is also better. In other words, it is guaranteed to apply for invention and utility model at the same time and get the certificate.
Disadvantages: high cost. Applying for two patents costs more than applying for only one patent.