First, practicality.
"Practicality" means that the effect or result of a patent should be useful to human beings or human society. Useless inventions (such as perpetual motion machines that violate the laws of nature) and inventions that violate public morality cannot be patented.
Practicality also includes the requirement of full explanation or disclosure. The patent specification submitted by the applicant must fully disclose the invention, and provide enough clear and definite information to enable technicians in related fields to make and use the invention, and at the same time disclose the best mode of the patent, but the failure to disclose the best mode does not affect the validity of the patent.
Second, novelty
A patent refers to an "innovative" invention that has been patented worldwide since the date of application, or has been applied in a publication, or has been publicly sold, used or otherwise widely known, or has been applied for by others and recorded in the patent documents that will be published or presumed to be published in the future. However, the inventor himself or the person who directly or indirectly obtained the invention from the inventor within one year before the patent application date will not lose novelty when disclosing the invention.
Third, it is not obvious.
On the whole, the invention in the patent application is obviously different from the existing technology at the time of patent application to people with general technical level in related fields, so the invention will not be granted patent or protected by patent.