Supplementary content of patent application

First, the patent application requires novelty, that is, the content of the patent application submitted first will affect the authorization of the patent application submitted later.

Second, after the patent application is submitted to the patent office, it is generally not allowed to supplement the patent content.

Therefore, if possible, it is best to apply once, so as to avoid the adverse impact of the later patent application on the earlier patent application.

Of course, if the content before and after (that is, what you intend to add) is more innovative, it will be less affected, so you can apply for two patents one after another.