1, registration system, also known as formal review system, preliminary review system and format review system.
2. Review system, also known as substantive review system, requires both preliminary review and actual review, so it is called complete review system. Among them, there are two kinds of immediate review system and deferred review system.
3. Review system. There are two types: one is to implement a complete review system only in some industrial technology fields; The other is to only examine the novelty in the "three natures".
At present, most countries in the world adopt the principle of "first application", that is, the same application, the patent right is granted to the person who applies first. The United States is implementing the "first invention principle".