What are the novelty requirements of patents?

Novelty means that the invention or utility model does not belong to the prior art; Before the filing date, no unit or individual filed an application with the Patent Office for the same invention or utility model, and it was recorded in the patent application documents published or announced after the filing date (including the filing date).

The legitimacy of novelty requirements comes from the patent contract theory, which holds that only when the public obtains certain benefits from patented technology can inventions obtain monopoly rights. Therefore, compared with the "existing technology", the invention-creation applying for patent should be not only original, but also "novel".