Is it necessary to apply for both utility model patent and invention patent for the same patent?

If you only apply for a patent for fame and fortune and don't want to spend too much money, apply for a patent for utility model. If you want to protect your invention, and the longer you protect it, the better, then I suggest you apply for a patent for invention as well as a patent for utility model. The reason is that the time from application to authorization of invention patents is too long, generally taking more than three years, while the time from application to authorization of utility model patents is relatively short, generally taking about one year. If both patents are applied, the early authorization of utility model can protect the invention as soon as possible. Once the invention patent is authorized, the utility model patent right can be abandoned. In this way, the invention can be protected by law in the shortest time, and it can also prevent others from taking advantage of the law and affecting your production and marketing.