1. Evidence about the infringer.
As the saying goes, know yourself and know yourself. Therefore, the exact name, address, enterprise nature, registered capital, number of personnel and business scope of the infringer are all things that the patentee should know first. It is very important for the patentee to know what strategies to take to deal with patent infringement.
2. Evidence of infringement facts.
The premise of patent infringement is that there must be infringement. Therefore, in the process of dealing with infringement, it is very important to prove that the infringer has indeed carried out the act of infringing the patent right. These evidences include physical objects, photos, product catalogues, sales invoices, purchase and sale contracts, etc.
3. Evidence about damages.
The patentee may claim damages from the infringer. The amount of compensation claimed may be the loss suffered by the patentee. However, the patentee shall provide evidence to prove that the sales volume of his patented product has decreased, or the sales price has decreased, and other expenses have been overpaid or underpaid.