Generally speaking, the fees for invalid requests include legal fees (the request fee paid to China National Intellectual Property Administration, the invention fee of 3,000 RMB, the utility model and appearance fee of 1500 yuan RMB+0,500 RMB), search fees, agency fees, and translation and evidence collection fees when necessary. The latter three fees are regulated by the market.
It is suggested to entrust professional and formal patent agencies with rich experience in patent invalidation, such as Beijing Hengbo Intellectual Property Agency Co., Ltd. and China National Intellectual Property Administration-recognized patent agency (agency code 1 1528), which has served many well-known enterprises and has a good reputation in the industry.