What are the patent search websites?

There are many patent inquiry websites, so choose to use them according to your actual needs, and use the following commonly used search networks (domestic):

1, ipa.gov.cn/sipopublicsearch/portal/uiIndex.shtml. China National Intellectual Property Administration patent retrieval analysis network.

2. Free commercial patent search website:/; /; /search/

3. Paid commercial patent search websites:/; /

It should be noted that because the utility model and design patents were published only after authorization, there is a blind spot in the retrieval results (the time between the application date and the authorization announcement date), so any retrieval method can not be completely retrieved.