Patent type without patent number

The patent number can only be used by the patentee, that is, the patentee has the right to mark the patent information on his patented product. Patented products should be approved by the patentee before they can be legally produced. The same is true for patented methods. Only with the consent of the patentee can others use them. From the propaganda point of view, the seller of patented goods can either sell patented products with the permission of the patentee or buy legitimate patented products from proper channels. In both cases, they can use patent information in advertisements. If the patent mark (the patent number you mentioned) is recorded on the non-patented product, it is illegal! I don't know exactly what happened to you, but that's all I can think of. I hope it helps you.