This statement is inaccurate.
The most basic principle for determining whether a patent infringement is infringement is comprehensive coverage, that is to say, the product or method should have every feature described in the patent claim, and none of them can be missing.
So after making modifications based on someone else’s patent, you need to re-judge whether it still contains all the technical features in the patent claims. For example, if one or more technical features are added to the patent, since all the technical features of the claim are still included, the risk of infringement will still be faced; if one or more technical features are reduced or changed on the basis of the patent , you may be able to successfully avoid the risk of infringement.
It is worth mentioning that every feature in the patent claim here, including the technical features of the product and the description of the patent claim, is exactly the same, that is, the same infringement; it also includes the product and the claim. If the recorded technical features use basically the same means to achieve basically the same functions and achieve basically the same effects, and can be thought of by ordinary technicians in the relevant technical field without creative work, it is equivalent to infringement.
Therefore, even if some technical features are reduced or changed, it may be determined to be patent infringement based on the principle of equivalent infringement. This requires that when changes and modifications are made, it is best to reflect technical effects that are different from the patented technology.