What evidence does the patentee need to provide in patent infringement litigation?

I. Evidence about the infringer Knowing the exact name, address, enterprise nature, registered capital, number of personnel and business scope of the infringer is the first thing the patentee should know, and it is very important for the patentee to know what strategies to take to deal with patent infringement. Second, the premise that the evidence of infringement facts constitutes 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. 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. The amount of compensation claimed can also be the profits obtained by the infringer due to the infringement. The patentee shall provide evidence to prove the infringer's sales volume, sales time, sales price, sales cost and sales profit, etc. On this basis, the profits of the infringer are calculated. The amount of compensation requested may also be no less than the patent license fee for the patent license transaction between the patentee and the third party. To this end, the patentee should provide a patent license agreement with a third party that has been effectively fulfilled. Evidence to be prepared as the plaintiff: a. Evidence of rights 1. Plaintiff's subject qualification certificate, natural person ID card, business license of enterprise or registration certificate of institution; 2. Patent certificate, which proves the ownership of the patent right at the time of authorization; 3. A copy of the patent register; 4. Patent authorization announcement text: Invention or utility model refers to the patent claim, specification, abstract and drawings; Pictures or photos of the design authorized by the announcement and a brief description; 5. Annual patent fee receipt: it proves that the patent continues to be valid; Land and utility model patent search report. B. Evidence of infringement 1. Documentary evidence: usually notarized; Second, physical evidence: infringing products purchased by the patentee from the market. C. evidence of loss 1. Patent licensing contract; Second, the financial audit report