I want to apply for a model patent for mechanical design.

In addition to the three characteristics that a patent must possess, there are also provisions on the writing requirements of documents. This patent can be applied for both invention and utility model patents at the same time, but only if two applications are submitted at the same time.

As for the documents, you only need to provide your technical information, invention background, uses, benefits and so on. In addition, for machinery, if there are drawings, it is best to give electronic drawings such as CAD drawings.

The specification, the abstract of the specification, the appended drawings of the abstract and the claims. These are all the contents you want to write.