What is a "supplementary patent"? What is an "imported patent"?

Supplementary patent refers to the patent being applied for, which can be amended if there are supplementary claims. This is clearly stipulated by law.

The legal basis is Article 33 of the Patent Law: "An applicant may modify his patent application documents, but the modification of the application documents for patents for inventions and utility models shall not exceed the scope recorded in the original specifications and claims, and the modification of the application documents for patents for designs shall not exceed the scope shown in the original pictures or photographs."