Is it useful to infringe the utility model patent and change the appearance?

Yes The utility model patent still depends on the internal structure and combination of the product, and only changing the appearance still constitutes infringement. The following situations are regarded as infringement of utility model patents:

1. To judge whether a patent is infringing, it is necessary to compare whether the technical features of the other product completely cover the technical features in the patent independent claim.

2. After being granted the patent right for invention and utility model, you shall not manufacture, use, promise to sell, sell or import the patented product for profit, nor use the patented method and use, promise to sell, sell or import the product obtained by the patented method.