What should I do if I apply for my invention first?

The main situations of the defense of the right of first use are as follows: the existing patented technology has been invented, but no patent has been applied for, and others have applied for a patent first, and the patentee can retain his patent right through defense and can sell it; However, the patent right cannot be transferred and licensed accordingly, and it can only be used by itself; It is not uncommon for patents to be granted repeatedly, and there will be corresponding legal coordination.