1. First of all, you must determine which patent you want to buy and whether it is authorized. You can go to the national intellectual property website to find patents that have been announced, or you can go to the patent transfer website, such as the European Shield Patent Trading Network, which has many patents in various fields. 2. Secondly, you can negotiate specific purchase matters with the patentee yourself or through an agency. Including: understanding of patented technology and price negotiation. 3. Agree on the specific rights to be transferred, whether the entire patent right will be transferred, or whether it will be an exclusive license. 4. Finally, you can go to the State Intellectual Property Office to handle the transfer procedures yourself or find a patent agency. Purchasing a patent means transferring the rights of that patent to your own name, which is basically the same as purchasing a trademark. The specific payment method needs to be negotiated by both parties, but usually the patent purchase is a one-time payment, and subsequent products have nothing to do with the patent owner. If it is a patent license, it is more linked to the production volume of the product, because this can charge more license fees. , it depends on the ideas and interests of both of you. According to Article 42 of the Patent Law, the term of invention patent rights is twenty years, and the term of utility model patent rights and design patent rights is ten years, both calculated from the date of application.