The retrieval results are not reliable, because even domestic patent applications, inventions, utility models and designs can't be retrieved before authorization, let alone foreign patents. ..
The general starting point of China's invention is to reduce the cost ... so it is almost impossible to achieve the same result behind closed doors as others. ..
So as long as there are differences, you basically meet the requirements of the utility model. ...
If this difference is not obvious to those skilled in the art ... and cannot be obtained through a limited number of experiments ... it can basically be judged that the requirements of the present invention are met. ..
Suppose you apply for a patent ... and the foreign products are the same as yours ... and then compare them with the foreign products according to the necessary technical characteristics recorded in your claim at this time ... When you cover them all, you think that you don't have three characteristics ... so it's easy to be invalidated. ..
But then again, finding a better patent agent can help you form a reasonable scope of protection ... even if it is invalidated in the future, you can keep a smaller scope of protection ... without all invalidation. ..
In the final analysis, it depends on what the purpose of your patent application is.