Excuse me, if you sell a product online, you have a patent but don't mark the patent number. You just need to write down the patent attached to the product. Is this a fine?

First of all, it is necessary to find out whether the patent right: 1) has been authorized and whether the status has been authorized; 2) Whether it is a patent corresponding to the product. If the product does have a patent, and the patent has been authorized and the status is correct, the patent number can be marked. Please note that this is possible, but not necessary.

However, it should be noted that the marked patent number cannot be an unauthorized patent application number, nor can it be the patent number of others, otherwise it will involve the act of counterfeiting patents as stipulated in Article 63 of the Patent Law.